// SPDX-License-Identifier: GPL-2.0-only

  /*
   *  linux/lib/vsprintf.c
   *
   *  Copyright (C) 1991, 1992  Linus Torvalds
   */
  
  /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
  /*
   * Wirzenius wrote this portably, Torvalds fucked it up :-)
   */

  /*

   * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com>
   * - changed to provide snprintf and vsnprintf functions
   * So Feb  1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de>
   * - scnprintf and vscnprintf
   */
  
  #include <stdarg.h>

  #include <linux/build_bug.h>

  #include <linux/clk.h>

  #include <linux/clk-provider.h>

  #include <linux/errname.h>

  #include <linux/module.h>	/* for KSYM_SYMBOL_LEN */

  #include <linux/types.h>
  #include <linux/string.h>
  #include <linux/ctype.h>
  #include <linux/kernel.h>

  #include <linux/kallsyms.h>

  #include <linux/math64.h>

  #include <linux/uaccess.h>

  #include <linux/ioport.h>

  #include <linux/dcache.h>

  #include <linux/cred.h>

  #include <linux/rtc.h>

  #include <linux/time.h>

  #include <linux/uuid.h>

  #include <linux/of.h>

  #include <net/addrconf.h>

  #include <linux/siphash.h>
  #include <linux/compiler.h>

  #include <linux/property.h>

  #ifdef CONFIG_BLOCK
  #include <linux/blkdev.h>
  #endif

  #include "../mm/internal.h"	/* For the trace_print_flags arrays */

  #include <asm/page.h>		/* for PAGE_SIZE */

  #include <asm/byteorder.h>	/* cpu_to_le16 */

  #include <linux/string_helpers.h>

  #include "kstrtox.h"

  /**

   * simple_strtoull - convert a string to an unsigned long long

   * @cp: The start of the string
   * @endp: A pointer to the end of the parsed string will be placed here
   * @base: The number base to use

   *

   * This function has caveats. Please use kstrtoull instead.

   */

  unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)

  {

  	unsigned long long result;
  	unsigned int rv;

  	cp = _parse_integer_fixup_radix(cp, &base);
  	rv = _parse_integer(cp, base, &result);
  	/* FIXME */
  	cp += (rv & ~KSTRTOX_OVERFLOW);

  	if (endp)
  		*endp = (char *)cp;

  	return result;
  }

  EXPORT_SYMBOL(simple_strtoull);

  
  /**

   * simple_strtoul - convert a string to an unsigned long

   * @cp: The start of the string
   * @endp: A pointer to the end of the parsed string will be placed here
   * @base: The number base to use

   *

   * This function has caveats. Please use kstrtoul instead.

   */

  unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)

  {

  	return simple_strtoull(cp, endp, base);

  }

  EXPORT_SYMBOL(simple_strtoul);

  
  /**

   * simple_strtol - convert a string to a signed long

   * @cp: The start of the string
   * @endp: A pointer to the end of the parsed string will be placed here
   * @base: The number base to use

   *

   * This function has caveats. Please use kstrtol instead.

   */

  long simple_strtol(const char *cp, char **endp, unsigned int base)

  {

  	if (*cp == '-')
  		return -simple_strtoul(cp + 1, endp, base);

  	return simple_strtoul(cp, endp, base);

  }

  EXPORT_SYMBOL(simple_strtol);

  
  /**
   * simple_strtoll - convert a string to a signed long long
   * @cp: The start of the string
   * @endp: A pointer to the end of the parsed string will be placed here
   * @base: The number base to use

   *

   * This function has caveats. Please use kstrtoll instead.

   */

  long long simple_strtoll(const char *cp, char **endp, unsigned int base)

  {

  	if (*cp == '-')

  		return -simple_strtoull(cp + 1, endp, base);

  	return simple_strtoull(cp, endp, base);

  }

  EXPORT_SYMBOL(simple_strtoll);

  static noinline_for_stack
  int skip_atoi(const char **s)

  {

  	int i = 0;

  	do {

  		i = i*10 + *((*s)++) - '0';

  	} while (isdigit(**s));

  	return i;
  }

  /*
   * Decimal conversion is by far the most typical, and is used for
   * /proc and /sys data. This directly impacts e.g. top performance
   * with many processes running. We optimize it for speed by emitting
   * two characters at a time, using a 200 byte lookup table. This
   * roughly halves the number of multiplications compared to computing
   * the digits one at a time. Implementation strongly inspired by the
   * previous version, which in turn used ideas described at
   * <http://www.cs.uiowa.edu/~jones/bcd/divide.html> (with permission
   * from the author, Douglas W. Jones).
   *
   * It turns out there is precisely one 26 bit fixed-point
   * approximation a of 64/100 for which x/100 == (x * (u64)a) >> 32
   * holds for all x in [0, 10^8-1], namely a = 0x28f5c29. The actual
   * range happens to be somewhat larger (x <= 1073741898), but that's
   * irrelevant for our purpose.
   *
   * For dividing a number in the range [10^4, 10^6-1] by 100, we still
   * need a 32x32->64 bit multiply, so we simply use the same constant.
   *
   * For dividing a number in the range [100, 10^4-1] by 100, there are
   * several options. The simplest is (x * 0x147b) >> 19, which is valid
   * for all x <= 43698.

   */

  static const u16 decpair[100] = {
  #define _(x) (__force u16) cpu_to_le16(((x % 10) | ((x / 10) << 8)) + 0x3030)
  	_( 0), _( 1), _( 2), _( 3), _( 4), _( 5), _( 6), _( 7), _( 8), _( 9),
  	_(10), _(11), _(12), _(13), _(14), _(15), _(16), _(17), _(18), _(19),
  	_(20), _(21), _(22), _(23), _(24), _(25), _(26), _(27), _(28), _(29),
  	_(30), _(31), _(32), _(33), _(34), _(35), _(36), _(37), _(38), _(39),
  	_(40), _(41), _(42), _(43), _(44), _(45), _(46), _(47), _(48), _(49),
  	_(50), _(51), _(52), _(53), _(54), _(55), _(56), _(57), _(58), _(59),
  	_(60), _(61), _(62), _(63), _(64), _(65), _(66), _(67), _(68), _(69),
  	_(70), _(71), _(72), _(73), _(74), _(75), _(76), _(77), _(78), _(79),
  	_(80), _(81), _(82), _(83), _(84), _(85), _(86), _(87), _(88), _(89),
  	_(90), _(91), _(92), _(93), _(94), _(95), _(96), _(97), _(98), _(99),
  #undef _
  };
  
  /*
   * This will print a single '0' even if r == 0, since we would

   * immediately jump to out_r where two 0s would be written but only
   * one of them accounted for in buf. This is needed by ip4_string
   * below. All other callers pass a non-zero value of r.

  */

  static noinline_for_stack

  char *put_dec_trunc8(char *buf, unsigned r)

  {

  	unsigned q;
  
  	/* 1 <= r < 10^8 */
  	if (r < 100)
  		goto out_r;
  
  	/* 100 <= r < 10^8 */
  	q = (r * (u64)0x28f5c29) >> 32;
  	*((u16 *)buf) = decpair[r - 100*q];
  	buf += 2;
  
  	/* 1 <= q < 10^6 */
  	if (q < 100)
  		goto out_q;
  
  	/*  100 <= q < 10^6 */
  	r = (q * (u64)0x28f5c29) >> 32;
  	*((u16 *)buf) = decpair[q - 100*r];
  	buf += 2;
  
  	/* 1 <= r < 10^4 */
  	if (r < 100)
  		goto out_r;
  
  	/* 100 <= r < 10^4 */
  	q = (r * 0x147b) >> 19;
  	*((u16 *)buf) = decpair[r - 100*q];
  	buf += 2;
  out_q:
  	/* 1 <= q < 100 */
  	r = q;
  out_r:
  	/* 1 <= r < 100 */
  	*((u16 *)buf) = decpair[r];

  	buf += r < 10 ? 1 : 2;

  	return buf;
  }

  #if BITS_PER_LONG == 64 && BITS_PER_LONG_LONG == 64

  static noinline_for_stack

  char *put_dec_full8(char *buf, unsigned r)

  {

  	unsigned q;

  	/* 0 <= r < 10^8 */
  	q = (r * (u64)0x28f5c29) >> 32;
  	*((u16 *)buf) = decpair[r - 100*q];
  	buf += 2;

  	/* 0 <= q < 10^6 */
  	r = (q * (u64)0x28f5c29) >> 32;
  	*((u16 *)buf) = decpair[q - 100*r];
  	buf += 2;

  	/* 0 <= r < 10^4 */
  	q = (r * 0x147b) >> 19;
  	*((u16 *)buf) = decpair[r - 100*q];
  	buf += 2;

  	/* 0 <= q < 100 */
  	*((u16 *)buf) = decpair[q];
  	buf += 2;
  	return buf;
  }

  static noinline_for_stack

  char *put_dec(char *buf, unsigned long long n)
  {

  	if (n >= 100*1000*1000)
  		buf = put_dec_full8(buf, do_div(n, 100*1000*1000));
  	/* 1 <= n <= 1.6e11 */
  	if (n >= 100*1000*1000)
  		buf = put_dec_full8(buf, do_div(n, 100*1000*1000));
  	/* 1 <= n < 1e8 */

  	return put_dec_trunc8(buf, n);

  }

  #elif BITS_PER_LONG == 32 && BITS_PER_LONG_LONG == 64

  static void
  put_dec_full4(char *buf, unsigned r)

  {

  	unsigned q;
  
  	/* 0 <= r < 10^4 */
  	q = (r * 0x147b) >> 19;
  	*((u16 *)buf) = decpair[r - 100*q];
  	buf += 2;
  	/* 0 <= q < 100 */
  	*((u16 *)buf) = decpair[q];

  }
  
  /*
   * Call put_dec_full4 on x % 10000, return x / 10000.
   * The approximation x/10000 == (x * 0x346DC5D7) >> 43
   * holds for all x < 1,128,869,999.  The largest value this
   * helper will ever be asked to convert is 1,125,520,955.

   * (second call in the put_dec code, assuming n is all-ones).

   */

  static noinline_for_stack

  unsigned put_dec_helper4(char *buf, unsigned x)
  {
          uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43;
  
          put_dec_full4(buf, x - q * 10000);
          return q;

  }

  /* Based on code by Douglas W. Jones found at
   * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour>
   * (with permission from the author).
   * Performs no 64-bit division and hence should be fast on 32-bit machines.
   */
  static
  char *put_dec(char *buf, unsigned long long n)
  {
  	uint32_t d3, d2, d1, q, h;
  
  	if (n < 100*1000*1000)
  		return put_dec_trunc8(buf, n);
  
  	d1  = ((uint32_t)n >> 16); /* implicit "& 0xffff" */
  	h   = (n >> 32);
  	d2  = (h      ) & 0xffff;
  	d3  = (h >> 16); /* implicit "& 0xffff" */

  	/* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0
  	     = 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */

  	q   = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff);

  	q = put_dec_helper4(buf, q);
  
  	q += 7671 * d3 + 9496 * d2 + 6 * d1;
  	q = put_dec_helper4(buf+4, q);
  
  	q += 4749 * d3 + 42 * d2;
  	q = put_dec_helper4(buf+8, q);

  	q += 281 * d3;
  	buf += 12;
  	if (q)
  		buf = put_dec_trunc8(buf, q);
  	else while (buf[-1] == '0')

  		--buf;
  
  	return buf;
  }
  
  #endif

  /*
   * Convert passed number to decimal string.
   * Returns the length of string.  On buffer overflow, returns 0.
   *
   * If speed is not important, use snprintf(). It's easy to read the code.
   */

  int num_to_str(char *buf, int size, unsigned long long num, unsigned int width)

  {

  	/* put_dec requires 2-byte alignment of the buffer. */
  	char tmp[sizeof(num) * 3] __aligned(2);

  	int idx, len;

  	/* put_dec() may work incorrectly for num = 0 (generate "", not "0") */
  	if (num <= 9) {
  		tmp[0] = '0' + num;
  		len = 1;
  	} else {
  		len = put_dec(tmp, num) - tmp;
  	}

  	if (len > size || width > size)

  		return 0;

  
  	if (width > len) {
  		width = width - len;
  		for (idx = 0; idx < width; idx++)
  			buf[idx] = ' ';
  	} else {
  		width = 0;
  	}

  	for (idx = 0; idx < len; ++idx)

  		buf[idx + width] = tmp[len - idx - 1];
  
  	return len + width;

  }

  #define SIGN	1		/* unsigned/signed, must be 1 */

  #define LEFT	2		/* left justified */

  #define PLUS	4		/* show plus */
  #define SPACE	8		/* space if plus */

  #define ZEROPAD	16		/* pad with zero, must be 16 == '0' - ' ' */

  #define SMALL	32		/* use lowercase in hex (must be 32 == 0x20) */
  #define SPECIAL	64		/* prefix hex with "0x", octal with "0" */

  static_assert(ZEROPAD == ('0' - ' '));
  static_assert(SMALL == ' ');

  enum format_type {
  	FORMAT_TYPE_NONE, /* Just a string part */

  	FORMAT_TYPE_WIDTH,

  	FORMAT_TYPE_PRECISION,
  	FORMAT_TYPE_CHAR,
  	FORMAT_TYPE_STR,
  	FORMAT_TYPE_PTR,
  	FORMAT_TYPE_PERCENT_CHAR,
  	FORMAT_TYPE_INVALID,
  	FORMAT_TYPE_LONG_LONG,
  	FORMAT_TYPE_ULONG,
  	FORMAT_TYPE_LONG,

  	FORMAT_TYPE_UBYTE,
  	FORMAT_TYPE_BYTE,

  	FORMAT_TYPE_USHORT,
  	FORMAT_TYPE_SHORT,
  	FORMAT_TYPE_UINT,
  	FORMAT_TYPE_INT,

  	FORMAT_TYPE_SIZE_T,
  	FORMAT_TYPE_PTRDIFF
  };
  
  struct printf_spec {

  	unsigned int	type:8;		/* format_type enum */
  	signed int	field_width:24;	/* width of output field */
  	unsigned int	flags:8;	/* flags to number() */
  	unsigned int	base:8;		/* number base, 8, 10 or 16 only */
  	signed int	precision:16;	/* # of digits/chars */
  } __packed;

  static_assert(sizeof(struct printf_spec) == 8);

  #define FIELD_WIDTH_MAX ((1 << 23) - 1)
  #define PRECISION_MAX ((1 << 15) - 1)

  static noinline_for_stack
  char *number(char *buf, char *end, unsigned long long num,
  	     struct printf_spec spec)

  {

  	/* put_dec requires 2-byte alignment of the buffer. */
  	char tmp[3 * sizeof(num)] __aligned(2);

  	char sign;
  	char locase;

  	int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);

  	int i;

  	bool is_zero = num == 0LL;

  	int field_width = spec.field_width;
  	int precision = spec.precision;

  	/* locase = 0 or 0x20. ORing digits or letters with 'locase'
  	 * produces same digits or (maybe lowercased) letters */

  	locase = (spec.flags & SMALL);
  	if (spec.flags & LEFT)
  		spec.flags &= ~ZEROPAD;

  	sign = 0;

  	if (spec.flags & SIGN) {

  		if ((signed long long)num < 0) {

  			sign = '-';

  			num = -(signed long long)num;

  			field_width--;

  		} else if (spec.flags & PLUS) {

  			sign = '+';

  			field_width--;

  		} else if (spec.flags & SPACE) {

  			sign = ' ';

  			field_width--;

  		}
  	}

  	if (need_pfx) {

  		if (spec.base == 16)

  			field_width -= 2;

  		else if (!is_zero)

  			field_width--;

  	}

  
  	/* generate full string in tmp[], in reverse order */

  	i = 0;

  	if (num < spec.base)

  		tmp[i++] = hex_asc_upper[num] | locase;

  	else if (spec.base != 10) { /* 8 or 16 */
  		int mask = spec.base - 1;

  		int shift = 3;

  
  		if (spec.base == 16)
  			shift = 4;

  		do {

  			tmp[i++] = (hex_asc_upper[((unsigned char)num) & mask] | locase);

  			num >>= shift;
  		} while (num);

  	} else { /* base 10 */
  		i = put_dec(tmp, num) - tmp;
  	}

  
  	/* printing 100 using %2d gives "100", not "00" */

  	if (i > precision)
  		precision = i;

  	/* leading space padding */

  	field_width -= precision;

  	if (!(spec.flags & (ZEROPAD | LEFT))) {

  		while (--field_width >= 0) {

  			if (buf < end)

  				*buf = ' ';
  			++buf;
  		}
  	}

  	/* sign */

  	if (sign) {

  		if (buf < end)

  			*buf = sign;
  		++buf;
  	}

  	/* "0x" / "0" prefix */
  	if (need_pfx) {

  		if (spec.base == 16 || !is_zero) {
  			if (buf < end)
  				*buf = '0';
  			++buf;
  		}

  		if (spec.base == 16) {

  			if (buf < end)

  				*buf = ('X' | locase);

  			++buf;
  		}
  	}

  	/* zero or space padding */

  	if (!(spec.flags & LEFT)) {

  		char c = ' ' + (spec.flags & ZEROPAD);

  		while (--field_width >= 0) {

  			if (buf < end)

  				*buf = c;
  			++buf;
  		}
  	}

  	/* hmm even more zero padding? */

  	while (i <= --precision) {

  		if (buf < end)

  			*buf = '0';
  		++buf;
  	}

  	/* actual digits of result */
  	while (--i >= 0) {

  		if (buf < end)

  			*buf = tmp[i];
  		++buf;
  	}

  	/* trailing space padding */

  	while (--field_width >= 0) {

  		if (buf < end)

  			*buf = ' ';
  		++buf;
  	}

  	return buf;
  }

  static noinline_for_stack
  char *special_hex_number(char *buf, char *end, unsigned long long num, int size)
  {
  	struct printf_spec spec;
  
  	spec.type = FORMAT_TYPE_PTR;
  	spec.field_width = 2 + 2 * size;	/* 0x + hex */
  	spec.flags = SPECIAL | SMALL | ZEROPAD;
  	spec.base = 16;
  	spec.precision = -1;
  
  	return number(buf, end, num, spec);
  }

  static void move_right(char *buf, char *end, unsigned len, unsigned spaces)

  {
  	size_t size;
  	if (buf >= end)	/* nowhere to put anything */
  		return;
  	size = end - buf;
  	if (size <= spaces) {
  		memset(buf, ' ', size);
  		return;
  	}
  	if (len) {
  		if (len > size - spaces)
  			len = size - spaces;
  		memmove(buf + spaces, buf, len);
  	}
  	memset(buf, ' ', spaces);
  }

  /*
   * Handle field width padding for a string.
   * @buf: current buffer position
   * @n: length of string
   * @end: end of output buffer
   * @spec: for field width and flags
   * Returns: new buffer position after padding.
   */
  static noinline_for_stack
  char *widen_string(char *buf, int n, char *end, struct printf_spec spec)
  {
  	unsigned spaces;
  
  	if (likely(n >= spec.field_width))
  		return buf;
  	/* we want to pad the sucker */
  	spaces = spec.field_width - n;
  	if (!(spec.flags & LEFT)) {
  		move_right(buf - n, end, n, spaces);
  		return buf + spaces;
  	}
  	while (spaces--) {
  		if (buf < end)
  			*buf = ' ';
  		++buf;
  	}
  	return buf;
  }

  /* Handle string from a well known address. */
  static char *string_nocheck(char *buf, char *end, const char *s,
  			    struct printf_spec spec)

  {

  	int len = 0;

  	int lim = spec.precision;

  	while (lim--) {
  		char c = *s++;
  		if (!c)
  			break;

  		if (buf < end)

  			*buf = c;

  		++buf;

  		++len;

  	}

  	return widen_string(buf, len, end, spec);

  }

  static char *err_ptr(char *buf, char *end, void *ptr,
  		     struct printf_spec spec)
  {
  	int err = PTR_ERR(ptr);
  	const char *sym = errname(err);
  
  	if (sym)
  		return string_nocheck(buf, end, sym, spec);
  
  	/*
  	 * Somebody passed ERR_PTR(-1234) or some other non-existing
  	 * Efoo - or perhaps CONFIG_SYMBOLIC_ERRNAME=n. Fall back to
  	 * printing it as its decimal representation.
  	 */
  	spec.flags |= SIGN;
  	spec.base = 10;
  	return number(buf, end, err, spec);
  }

  /* Be careful: error messages must fit into the given buffer. */
  static char *error_string(char *buf, char *end, const char *s,
  			  struct printf_spec spec)
  {
  	/*
  	 * Hard limit to avoid a completely insane messages. It actually
  	 * works pretty well because most error messages are in
  	 * the many pointer format modifiers.
  	 */
  	if (spec.precision == -1)
  		spec.precision = 2 * sizeof(void *);
  
  	return string_nocheck(buf, end, s, spec);
  }

  /*

   * Do not call any complex external code here. Nested printk()/vsprintf()
   * might cause infinite loops. Failures might break printk() and would
   * be hard to debug.

   */
  static const char *check_pointer_msg(const void *ptr)
  {

  	if (!ptr)
  		return "(null)";

  	if ((unsigned long)ptr < PAGE_SIZE || IS_ERR_VALUE(ptr))

  		return "(efault)";
  
  	return NULL;
  }
  
  static int check_pointer(char **buf, char *end, const void *ptr,
  			 struct printf_spec spec)
  {
  	const char *err_msg;
  
  	err_msg = check_pointer_msg(ptr);
  	if (err_msg) {

  		*buf = error_string(*buf, end, err_msg, spec);

  		return -EFAULT;
  	}
  
  	return 0;
  }

  static noinline_for_stack

  char *string(char *buf, char *end, const char *s,
  	     struct printf_spec spec)
  {

  	if (check_pointer(&buf, end, s, spec))
  		return buf;

  
  	return string_nocheck(buf, end, s, spec);
  }

  static char *pointer_string(char *buf, char *end,
  			    const void *ptr,
  			    struct printf_spec spec)

  {
  	spec.base = 16;
  	spec.flags |= SMALL;
  	if (spec.field_width == -1) {
  		spec.field_width = 2 * sizeof(ptr);
  		spec.flags |= ZEROPAD;
  	}
  
  	return number(buf, end, (unsigned long int)ptr, spec);
  }
  
  /* Make pointers available for printing early in the boot sequence. */
  static int debug_boot_weak_hash __ro_after_init;
  
  static int __init debug_boot_weak_hash_enable(char *str)
  {
  	debug_boot_weak_hash = 1;
  	pr_info("debug_boot_weak_hash enabled
  ");
  	return 0;
  }
  early_param("debug_boot_weak_hash", debug_boot_weak_hash_enable);
  
  static DEFINE_STATIC_KEY_TRUE(not_filled_random_ptr_key);
  static siphash_key_t ptr_key __read_mostly;
  
  static void enable_ptr_key_workfn(struct work_struct *work)
  {
  	get_random_bytes(&ptr_key, sizeof(ptr_key));
  	/* Needs to run from preemptible context */
  	static_branch_disable(&not_filled_random_ptr_key);
  }
  
  static DECLARE_WORK(enable_ptr_key_work, enable_ptr_key_workfn);
  
  static void fill_random_ptr_key(struct random_ready_callback *unused)
  {
  	/* This may be in an interrupt handler. */
  	queue_work(system_unbound_wq, &enable_ptr_key_work);
  }
  
  static struct random_ready_callback random_ready = {
  	.func = fill_random_ptr_key
  };
  
  static int __init initialize_ptr_random(void)
  {
  	int key_size = sizeof(ptr_key);
  	int ret;
  
  	/* Use hw RNG if available. */
  	if (get_random_bytes_arch(&ptr_key, key_size) == key_size) {
  		static_branch_disable(&not_filled_random_ptr_key);
  		return 0;
  	}
  
  	ret = add_random_ready_callback(&random_ready);
  	if (!ret) {
  		return 0;
  	} else if (ret == -EALREADY) {
  		/* This is in preemptible context */
  		enable_ptr_key_workfn(&enable_ptr_key_work);
  		return 0;
  	}
  
  	return ret;
  }
  early_initcall(initialize_ptr_random);
  
  /* Maps a pointer to a 32 bit unique identifier. */

  static inline int __ptr_to_hashval(const void *ptr, unsigned long *hashval_out)
  {
  	unsigned long hashval;
  
  	if (static_branch_unlikely(&not_filled_random_ptr_key))
  		return -EAGAIN;
  
  #ifdef CONFIG_64BIT
  	hashval = (unsigned long)siphash_1u64((u64)ptr, &ptr_key);
  	/*
  	 * Mask off the first 32 bits, this makes explicit that we have
  	 * modified the address (and 32 bits is plenty for a unique ID).
  	 */
  	hashval = hashval & 0xffffffff;
  #else
  	hashval = (unsigned long)siphash_1u32((u32)ptr, &ptr_key);
  #endif
  	*hashval_out = hashval;
  	return 0;
  }
  
  int ptr_to_hashval(const void *ptr, unsigned long *hashval_out)
  {
  	return __ptr_to_hashval(ptr, hashval_out);
  }

  static char *ptr_to_id(char *buf, char *end, const void *ptr,
  		       struct printf_spec spec)
  {
  	const char *str = sizeof(ptr) == 8 ? "(____ptrval____)" : "(ptrval)";
  	unsigned long hashval;

  	int ret;

  	/*
  	 * Print the real pointer value for NULL and error pointers,
  	 * as they are not actual addresses.
  	 */
  	if (IS_ERR_OR_NULL(ptr))
  		return pointer_string(buf, end, ptr, spec);

  	/* When debugging early boot use non-cryptographically secure hash. */
  	if (unlikely(debug_boot_weak_hash)) {
  		hashval = hash_long((unsigned long)ptr, 32);
  		return pointer_string(buf, end, (const void *)hashval, spec);
  	}

  	ret = __ptr_to_hashval(ptr, &hashval);
  	if (ret) {

  		spec.field_width = 2 * sizeof(ptr);
  		/* string length must be less than default_width */

  		return error_string(buf, end, str, spec);

  	}

  	return pointer_string(buf, end, (const void *)hashval, spec);
  }

  int kptr_restrict __read_mostly;
  
  static noinline_for_stack
  char *restricted_pointer(char *buf, char *end, const void *ptr,
  			 struct printf_spec spec)
  {
  	switch (kptr_restrict) {
  	case 0:

  		/* Handle as %p, hash and do _not_ leak addresses. */
  		return ptr_to_id(buf, end, ptr, spec);

  	case 1: {
  		const struct cred *cred;
  
  		/*
  		 * kptr_restrict==1 cannot be used in IRQ context
  		 * because its test for CAP_SYSLOG would be meaningless.
  		 */
  		if (in_irq() || in_serving_softirq() || in_nmi()) {
  			if (spec.field_width == -1)
  				spec.field_width = 2 * sizeof(ptr);

  			return error_string(buf, end, "pK-error", spec);

  		}
  
  		/*
  		 * Only print the real pointer value if the current
  		 * process has CAP_SYSLOG and is running with the
  		 * same credentials it started with. This is because
  		 * access to files is checked at open() time, but %pK
  		 * checks permission at read() time. We don't want to
  		 * leak pointer values if a binary opens a file using
  		 * %pK and then elevates privileges before reading it.
  		 */
  		cred = current_cred();
  		if (!has_capability_noaudit(current, CAP_SYSLOG) ||
  		    !uid_eq(cred->euid, cred->uid) ||
  		    !gid_eq(cred->egid, cred->gid))
  			ptr = NULL;
  		break;
  	}
  	case 2:
  	default:
  		/* Always print 0's for %pK */
  		ptr = NULL;
  		break;
  	}
  
  	return pointer_string(buf, end, ptr, spec);
  }

  static noinline_for_stack

  char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec,
  		  const char *fmt)
  {
  	const char *array[4], *s;
  	const struct dentry *p;
  	int depth;
  	int i, n;
  
  	switch (fmt[1]) {
  		case '2': case '3': case '4':
  			depth = fmt[1] - '0';
  			break;
  		default:
  			depth = 1;
  	}
  
  	rcu_read_lock();
  	for (i = 0; i < depth; i++, d = p) {

  		if (check_pointer(&buf, end, d, spec)) {
  			rcu_read_unlock();
  			return buf;
  		}

  		p = READ_ONCE(d->d_parent);
  		array[i] = READ_ONCE(d->d_name.name);

  		if (p == d) {
  			if (i)
  				array[i] = "";
  			i++;
  			break;
  		}
  	}
  	s = array[--i];
  	for (n = 0; n != spec.precision; n++, buf++) {
  		char c = *s++;
  		if (!c) {
  			if (!i)
  				break;
  			c = '/';
  			s = array[--i];
  		}
  		if (buf < end)
  			*buf = c;
  	}
  	rcu_read_unlock();

  	return widen_string(buf, n, end, spec);

  }

  static noinline_for_stack
  char *file_dentry_name(char *buf, char *end, const struct file *f,
  			struct printf_spec spec, const char *fmt)
  {
  	if (check_pointer(&buf, end, f, spec))
  		return buf;
  
  	return dentry_name(buf, end, f->f_path.dentry, spec, fmt);
  }

  #ifdef CONFIG_BLOCK
  static noinline_for_stack
  char *bdev_name(char *buf, char *end, struct block_device *bdev,
  		struct printf_spec spec, const char *fmt)
  {

  	struct gendisk *hd;
  
  	if (check_pointer(&buf, end, bdev, spec))
  		return buf;
  
  	hd = bdev->bd_disk;

  	buf = string(buf, end, hd->disk_name, spec);

  	if (bdev->bd_partno) {

  		if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) {
  			if (buf < end)
  				*buf = 'p';
  			buf++;
  		}

  		buf = number(buf, end, bdev->bd_partno, spec);

  	}
  	return buf;
  }
  #endif

  static noinline_for_stack
  char *symbol_string(char *buf, char *end, void *ptr,

  		    struct printf_spec spec, const char *fmt)

  {

  	unsigned long value;

  #ifdef CONFIG_KALLSYMS
  	char sym[KSYM_SYMBOL_LEN];

  #endif
  
  	if (fmt[1] == 'R')
  		ptr = __builtin_extract_return_addr(ptr);
  	value = (unsigned long)ptr;
  
  #ifdef CONFIG_KALLSYMS
  	if (*fmt == 'B')

  		sprint_backtrace(sym, value);

  	else if (*fmt != 's')

  		sprint_symbol(sym, value);
  	else

  		sprint_symbol_no_offset(sym, value);

  	return string_nocheck(buf, end, sym, spec);

  #else

  	return special_hex_number(buf, end, value, sizeof(void *));

  #endif
  }

  static const struct printf_spec default_str_spec = {
  	.field_width = -1,
  	.precision = -1,
  };

  static const struct printf_spec default_flag_spec = {
  	.base = 16,
  	.precision = -1,
  	.flags = SPECIAL | SMALL,
  };

  static const struct printf_spec default_dec_spec = {
  	.base = 10,
  	.precision = -1,
  };

  static const struct printf_spec default_dec02_spec = {
  	.base = 10,
  	.field_width = 2,
  	.precision = -1,
  	.flags = ZEROPAD,
  };
  
  static const struct printf_spec default_dec04_spec = {
  	.base = 10,
  	.field_width = 4,
  	.precision = -1,
  	.flags = ZEROPAD,
  };

  static noinline_for_stack
  char *resource_string(char *buf, char *end, struct resource *res,
  		      struct printf_spec spec, const char *fmt)

  {
  #ifndef IO_RSRC_PRINTK_SIZE

  #define IO_RSRC_PRINTK_SIZE	6

  #endif
  
  #ifndef MEM_RSRC_PRINTK_SIZE

  #define MEM_RSRC_PRINTK_SIZE	10

  #endif

  	static const struct printf_spec io_spec = {

  		.base = 16,

  		.field_width = IO_RSRC_PRINTK_SIZE,

  		.precision = -1,
  		.flags = SPECIAL | SMALL | ZEROPAD,
  	};

  	static const struct printf_spec mem_spec = {
  		.base = 16,
  		.field_width = MEM_RSRC_PRINTK_SIZE,
  		.precision = -1,
  		.flags = SPECIAL | SMALL | ZEROPAD,
  	};

  	static const struct printf_spec bus_spec = {
  		.base = 16,
  		.field_width = 2,
  		.precision = -1,
  		.flags = SMALL | ZEROPAD,
  	};

  	static const struct printf_spec str_spec = {

  		.field_width = -1,
  		.precision = 10,
  		.flags = LEFT,
  	};

  
  	/* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
  	 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
  #define RSRC_BUF_SIZE		((2 * sizeof(resource_size_t)) + 4)
  #define FLAG_BUF_SIZE		(2 * sizeof(res->flags))

  #define DECODED_BUF_SIZE	sizeof("[mem - 64bit pref window disabled]")

  #define RAW_BUF_SIZE		sizeof("[mem - flags 0x]")
  	char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
  		     2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];

  	char *p = sym, *pend = sym + sizeof(sym);

  	int decode = (fmt[0] == 'R') ? 1 : 0;

  	const struct printf_spec *specp;

  	if (check_pointer(&buf, end, res, spec))
  		return buf;

  	*p++ = '[';

  	if (res->flags & IORESOURCE_IO) {

  		p = string_nocheck(p, pend, "io  ", str_spec);

  		specp = &io_spec;
  	} else if (res->flags & IORESOURCE_MEM) {

  		p = string_nocheck(p, pend, "mem ", str_spec);

  		specp = &mem_spec;
  	} else if (res->flags & IORESOURCE_IRQ) {

  		p = string_nocheck(p, pend, "irq ", str_spec);

  		specp = &default_dec_spec;

  	} else if (res->flags & IORESOURCE_DMA) {

  		p = string_nocheck(p, pend, "dma ", str_spec);

  		specp = &default_dec_spec;

  	} else if (res->flags & IORESOURCE_BUS) {

  		p = string_nocheck(p, pend, "bus ", str_spec);

  		specp = &bus_spec;

  	} else {

  		p = string_nocheck(p, pend, "??? ", str_spec);

  		specp = &mem_spec;

  		decode = 0;

  	}

  	if (decode && res->flags & IORESOURCE_UNSET) {

  		p = string_nocheck(p, pend, "size ", str_spec);

  		p = number(p, pend, resource_size(res), *specp);
  	} else {
  		p = number(p, pend, res->start, *specp);
  		if (res->start != res->end) {
  			*p++ = '-';
  			p = number(p, pend, res->end, *specp);
  		}

  	}

  	if (decode) {

  		if (res->flags & IORESOURCE_MEM_64)

  			p = string_nocheck(p, pend, " 64bit", str_spec);

  		if (res->flags & IORESOURCE_PREFETCH)

  			p = string_nocheck(p, pend, " pref", str_spec);

  		if (res->flags & IORESOURCE_WINDOW)

  			p = string_nocheck(p, pend, " window", str_spec);

  		if (res->flags & IORESOURCE_DISABLED)

  			p = string_nocheck(p, pend, " disabled", str_spec);

  	} else {

  		p = string_nocheck(p, pend, " flags ", str_spec);

  		p = number(p, pend, res->flags, default_flag_spec);

  	}

  	*p++ = ']';

  	*p = '\0';

  	return string_nocheck(buf, end, sym, spec);

  }

  static noinline_for_stack

  char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
  		 const char *fmt)
  {

  	int i, len = 1;		/* if we pass '%ph[CDN]', field width remains

  				   negative value, fallback to the default */
  	char separator;
  
  	if (spec.field_width == 0)
  		/* nothing to print */
  		return buf;

  	if (check_pointer(&buf, end, addr, spec))
  		return buf;

  
  	switch (fmt[1]) {
  	case 'C':
  		separator = ':';
  		break;
  	case 'D':
  		separator = '-';
  		break;
  	case 'N':
  		separator = 0;
  		break;
  	default:
  		separator = ' ';
  		break;
  	}
  
  	if (spec.field_width > 0)
  		len = min_t(int, spec.field_width, 64);

  	for (i = 0; i < len; ++i) {
  		if (buf < end)
  			*buf = hex_asc_hi(addr[i]);
  		++buf;
  		if (buf < end)
  			*buf = hex_asc_lo(addr[i]);
  		++buf;

  		if (separator && i != len - 1) {
  			if (buf < end)
  				*buf = separator;
  			++buf;
  		}

  	}
  
  	return buf;
  }
  
  static noinline_for_stack

  char *bitmap_string(char *buf, char *end, unsigned long *bitmap,
  		    struct printf_spec spec, const char *fmt)
  {
  	const int CHUNKSZ = 32;
  	int nr_bits = max_t(int, spec.field_width, 0);
  	int i, chunksz;
  	bool first = true;

  	if (check_pointer(&buf, end, bitmap, spec))
  		return buf;

  	/* reused to print numbers */
  	spec = (struct printf_spec){ .flags = SMALL | ZEROPAD, .base = 16 };
  
  	chunksz = nr_bits & (CHUNKSZ - 1);
  	if (chunksz == 0)
  		chunksz = CHUNKSZ;
  
  	i = ALIGN(nr_bits, CHUNKSZ) - CHUNKSZ;
  	for (; i >= 0; i -= CHUNKSZ) {
  		u32 chunkmask, val;
  		int word, bit;
  
  		chunkmask = ((1ULL << chunksz) - 1);
  		word = i / BITS_PER_LONG;
  		bit = i % BITS_PER_LONG;
  		val = (bitmap[word] >> bit) & chunkmask;
  
  		if (!first) {
  			if (buf < end)
  				*buf = ',';
  			buf++;
  		}
  		first = false;
  
  		spec.field_width = DIV_ROUND_UP(chunksz, 4);
  		buf = number(buf, end, val, spec);
  
  		chunksz = CHUNKSZ;
  	}
  	return buf;
  }
  
  static noinline_for_stack
  char *bitmap_list_string(char *buf, char *end, unsigned long *bitmap,
  			 struct printf_spec spec, const char *fmt)
  {
  	int nr_bits = max_t(int, spec.field_width, 0);
  	/* current bit is 'cur', most recently seen range is [rbot, rtop] */
  	int cur, rbot, rtop;
  	bool first = true;

  	if (check_pointer(&buf, end, bitmap, spec))
  		return buf;

  	rbot = cur = find_first_bit(bitmap, nr_bits);
  	while (cur < nr_bits) {
  		rtop = cur;
  		cur = find_next_bit(bitmap, nr_bits, cur + 1);
  		if (cur < nr_bits && cur <= rtop + 1)
  			continue;
  
  		if (!first) {
  			if (buf < end)
  				*buf = ',';
  			buf++;
  		}
  		first = false;

  		buf = number(buf, end, rbot, default_dec_spec);

  		if (rbot < rtop) {
  			if (buf < end)
  				*buf = '-';
  			buf++;

  			buf = number(buf, end, rtop, default_dec_spec);

  		}
  
  		rbot = cur;
  	}
  	return buf;
  }
  
  static noinline_for_stack

  char *mac_address_string(char *buf, char *end, u8 *addr,
  			 struct printf_spec spec, const char *fmt)

  {

  	char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];

  	char *p = mac_addr;
  	int i;

  	char separator;

  	bool reversed = false;

  	if (check_pointer(&buf, end, addr, spec))
  		return buf;

  	switch (fmt[1]) {
  	case 'F':

  		separator = '-';

  		break;
  
  	case 'R':
  		reversed = true;

  		/* fall through */

  
  	default:

  		separator = ':';

  		break;

  	}

  
  	for (i = 0; i < 6; i++) {

  		if (reversed)
  			p = hex_byte_pack(p, addr[5 - i]);
  		else
  			p = hex_byte_pack(p, addr[i]);

  		if (fmt[0] == 'M' && i != 5)

  			*p++ = separator;

  	}
  	*p = '\0';

  	return string_nocheck(buf, end, mac_addr, spec);

  }

  static noinline_for_stack
  char *ip4_string(char *p, const u8 *addr, const char *fmt)

  {
  	int i;

  	bool leading_zeros = (fmt[0] == 'i');
  	int index;
  	int step;
  
  	switch (fmt[2]) {
  	case 'h':
  #ifdef __BIG_ENDIAN
  		index = 0;
  		step = 1;
  #else
  		index = 3;
  		step = -1;
  #endif
  		break;
  	case 'l':
  		index = 3;
  		step = -1;
  		break;
  	case 'n':
  	case 'b':
  	default:
  		index = 0;
  		step = 1;
  		break;
  	}

  	for (i = 0; i < 4; i++) {

  		char temp[4] __aligned(2);	/* hold each IP quad in reverse order */

  		int digits = put_dec_trunc8(temp, addr[index]) - temp;

  		if (leading_zeros) {
  			if (digits < 3)
  				*p++ = '0';
  			if (digits < 2)
  				*p++ = '0';
  		}
  		/* reverse the digits in the quad */
  		while (digits--)
  			*p++ = temp[digits];
  		if (i < 3)
  			*p++ = '.';

  		index += step;

  	}

  	*p = '\0';

  	return p;
  }

  static noinline_for_stack
  char *ip6_compressed_string(char *p, const char *addr)

  {

  	int i, j, range;

  	unsigned char zerolength[8];
  	int longest = 1;
  	int colonpos = -1;
  	u16 word;

  	u8 hi, lo;

  	bool needcolon = false;

  	bool useIPv4;
  	struct in6_addr in6;
  
  	memcpy(&in6, addr, sizeof(struct in6_addr));
  
  	useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);

  
  	memset(zerolength, 0, sizeof(zerolength));
  
  	if (useIPv4)
  		range = 6;
  	else
  		range = 8;
  
  	/* find position of longest 0 run */
  	for (i = 0; i < range; i++) {
  		for (j = i; j < range; j++) {

  			if (in6.s6_addr16[j] != 0)

  				break;
  			zerolength[i]++;
  		}
  	}
  	for (i = 0; i < range; i++) {
  		if (zerolength[i] > longest) {
  			longest = zerolength[i];
  			colonpos = i;
  		}
  	}

  	if (longest == 1)		/* don't compress a single 0 */
  		colonpos = -1;

  	/* emit address */
  	for (i = 0; i < range; i++) {
  		if (i == colonpos) {
  			if (needcolon || i == 0)
  				*p++ = ':';
  			*p++ = ':';
  			needcolon = false;
  			i += longest - 1;
  			continue;
  		}
  		if (needcolon) {
  			*p++ = ':';
  			needcolon = false;
  		}
  		/* hex u16 without leading 0s */

  		word = ntohs(in6.s6_addr16[i]);

  		hi = word >> 8;
  		lo = word & 0xff;
  		if (hi) {
  			if (hi > 0x0f)

  				p = hex_byte_pack(p, hi);

  			else
  				*p++ = hex_asc_lo(hi);

  			p = hex_byte_pack(p, lo);

  		}

  		else if (lo > 0x0f)

  			p = hex_byte_pack(p, lo);

  		else
  			*p++ = hex_asc_lo(lo);
  		needcolon = true;
  	}
  
  	if (useIPv4) {
  		if (needcolon)
  			*p++ = ':';

  		p = ip4_string(p, &in6.s6_addr[12], "I4");

  	}

  	*p = '\0';

  	return p;
  }

  static noinline_for_stack
  char *ip6_string(char *p, const char *addr, const char *fmt)

  {
  	int i;

  	for (i = 0; i < 8; i++) {

  		p = hex_byte_pack(p, *addr++);
  		p = hex_byte_pack(p, *addr++);

  		if (fmt[0] == 'I' && i != 7)

  			*p++ = ':';
  	}
  	*p = '\0';

  	return p;
  }

  static noinline_for_stack
  char *ip6_addr_string(char *buf, char *end, const u8 *addr,
  		      struct printf_spec spec, const char *fmt)

  {
  	char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
  
  	if (fmt[0] == 'I' && fmt[2] == 'c')

  		ip6_compressed_string(ip6_addr, addr);

  	else

  		ip6_string(ip6_addr, addr, fmt);

  	return string_nocheck(buf, end, ip6_addr, spec);

  }

  static noinline_for_stack
  char *ip4_addr_string(char *buf, char *end, const u8 *addr,
  		      struct printf_spec spec, const char *fmt)

  {

  	char ip4_addr[sizeof("255.255.255.255")];

  	ip4_string(ip4_addr, addr, fmt);

  	return string_nocheck(buf, end, ip4_addr, spec);

  }

  static noinline_for_stack

  char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa,
  			 struct printf_spec spec, const char *fmt)
  {
  	bool have_p = false, have_s = false, have_f = false, have_c = false;
  	char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") +
  		      sizeof(":12345") + sizeof("/123456789") +
  		      sizeof("%1234567890")];
  	char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr);
  	const u8 *addr = (const u8 *) &sa->sin6_addr;
  	char fmt6[2] = { fmt[0], '6' };
  	u8 off = 0;
  
  	fmt++;
  	while (isalpha(*++fmt)) {
  		switch (*fmt) {
  		case 'p':
  			have_p = true;
  			break;
  		case 'f':
  			have_f = true;
  			break;
  		case 's':
  			have_s = true;
  			break;
  		case 'c':
  			have_c = true;
  			break;
  		}
  	}
  
  	if (have_p || have_s || have_f) {
  		*p = '[';
  		off = 1;
  	}
  
  	if (fmt6[0] == 'I' && have_c)
  		p = ip6_compressed_string(ip6_addr + off, addr);
  	else
  		p = ip6_string(ip6_addr + off, addr, fmt6);
  
  	if (have_p || have_s || have_f)
  		*p++ = ']';
  
  	if (have_p) {
  		*p++ = ':';
  		p = number(p, pend, ntohs(sa->sin6_port), spec);
  	}
  	if (have_f) {
  		*p++ = '/';
  		p = number(p, pend, ntohl(sa->sin6_flowinfo &
  					  IPV6_FLOWINFO_MASK), spec);
  	}
  	if (have_s) {
  		*p++ = '%';
  		p = number(p, pend, sa->sin6_scope_id, spec);
  	}
  	*p = '\0';

  	return string_nocheck(buf, end, ip6_addr, spec);

  }
  
  static noinline_for_stack
  char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa,
  			 struct printf_spec spec, const char *fmt)
  {
  	bool have_p = false;
  	char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")];
  	char *pend = ip4_addr + sizeof(ip4_addr);
  	const u8 *addr = (const u8 *) &sa->sin_addr.s_addr;
  	char fmt4[3] = { fmt[0], '4', 0 };
  
  	fmt++;
  	while (isalpha(*++fmt)) {
  		switch (*fmt) {
  		case 'p':
  			have_p = true;
  			break;
  		case 'h':
  		case 'l':
  		case 'n':
  		case 'b':
  			fmt4[2] = *fmt;
  			break;
  		}
  	}
  
  	p = ip4_string(ip4_addr, addr, fmt4);
  	if (have_p) {
  		*p++ = ':';
  		p = number(p, pend, ntohs(sa->sin_port), spec);
  	}
  	*p = '\0';

  	return string_nocheck(buf, end, ip4_addr, spec);

  }
  
  static noinline_for_stack

  char *ip_addr_string(char *buf, char *end, const void *ptr,
  		     struct printf_spec spec, const char *fmt)
  {

  	char *err_fmt_msg;

  	if (check_pointer(&buf, end, ptr, spec))
  		return buf;

  	switch (fmt[1]) {
  	case '6':
  		return ip6_addr_string(buf, end, ptr, spec, fmt);
  	case '4':
  		return ip4_addr_string(buf, end, ptr, spec, fmt);
  	case 'S': {
  		const union {
  			struct sockaddr		raw;
  			struct sockaddr_in	v4;
  			struct sockaddr_in6	v6;
  		} *sa = ptr;
  
  		switch (sa->raw.sa_family) {
  		case AF_INET:
  			return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt);
  		case AF_INET6:
  			return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt);
  		default:

  			return error_string(buf, end, "(einval)", spec);

  		}}
  	}

  	err_fmt_msg = fmt[0] == 'i' ? "(%pi?)" : "(%pI?)";

  	return error_string(buf, end, err_fmt_msg, spec);

  }
  
  static noinline_for_stack

  char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
  		     const char *fmt)
  {
  	bool found = true;
  	int count = 1;
  	unsigned int flags = 0;
  	int len;
  
  	if (spec.field_width == 0)
  		return buf;				/* nothing to print */

  	if (check_pointer(&buf, end, addr, spec))
  		return buf;

  
  	do {
  		switch (fmt[count++]) {
  		case 'a':
  			flags |= ESCAPE_ANY;
  			break;
  		case 'c':
  			flags |= ESCAPE_SPECIAL;
  			break;
  		case 'h':
  			flags |= ESCAPE_HEX;
  			break;
  		case 'n':
  			flags |= ESCAPE_NULL;
  			break;
  		case 'o':
  			flags |= ESCAPE_OCTAL;
  			break;
  		case 'p':
  			flags |= ESCAPE_NP;
  			break;
  		case 's':
  			flags |= ESCAPE_SPACE;
  			break;
  		default:
  			found = false;
  			break;
  		}
  	} while (found);
  
  	if (!flags)
  		flags = ESCAPE_ANY_NP;
  
  	len = spec.field_width < 0 ? 1 : spec.field_width;

  	/*
  	 * string_escape_mem() writes as many characters as it can to
  	 * the given buffer, and returns the total size of the output
  	 * had the buffer been big enough.
  	 */
  	buf += string_escape_mem(addr, len, buf, buf < end ? end - buf : 0, flags, NULL);

  
  	return buf;
  }

  static char *va_format(char *buf, char *end, struct va_format *va_fmt,
  		       struct printf_spec spec, const char *fmt)

  {
  	va_list va;

  	if (check_pointer(&buf, end, va_fmt, spec))
  		return buf;

  	va_copy(va, *va_fmt->va);
  	buf += vsnprintf(buf, end > buf ? end - buf : 0, va_fmt->fmt, va);
  	va_end(va);
  
  	return buf;
  }

  static noinline_for_stack

  char *uuid_string(char *buf, char *end, const u8 *addr,
  		  struct printf_spec spec, const char *fmt)

  {

  	char uuid[UUID_STRING_LEN + 1];

  	char *p = uuid;
  	int i;

  	const u8 *index = uuid_index;

  	bool uc = false;

  	if (check_pointer(&buf, end, addr, spec))
  		return buf;

  	switch (*(++fmt)) {
  	case 'L':

  		uc = true;

  		/* fall through */

  	case 'l':

  		index = guid_index;

  		break;
  	case 'B':
  		uc = true;
  		break;
  	}
  
  	for (i = 0; i < 16; i++) {

  		if (uc)
  			p = hex_byte_pack_upper(p, addr[index[i]]);
  		else
  			p = hex_byte_pack(p, addr[index[i]]);

  		switch (i) {
  		case 3:
  		case 5:
  		case 7:
  		case 9:
  			*p++ = '-';
  			break;
  		}
  	}
  
  	*p = 0;

  	return string_nocheck(buf, end, uuid, spec);

  }

  static noinline_for_stack

  char *netdev_bits(char *buf, char *end, const void *addr,
  		  struct printf_spec spec,  const char *fmt)

  {

  	unsigned long long num;
  	int size;

  	if (check_pointer(&buf, end, addr, spec))
  		return buf;

  	switch (fmt[1]) {
  	case 'F':
  		num = *(const netdev_features_t *)addr;
  		size = sizeof(netdev_features_t);
  		break;
  	default:

  		return error_string(buf, end, "(%pN?)", spec);

  	}

  	return special_hex_number(buf, end, num, size);

  }

  static noinline_for_stack

  char *address_val(char *buf, char *end, const void *addr,
  		  struct printf_spec spec, const char *fmt)

  {
  	unsigned long long num;

  	int size;

  	if (check_pointer(&buf, end, addr, spec))
  		return buf;

  	switch (fmt[1]) {
  	case 'd':
  		num = *(const dma_addr_t *)addr;

  		size = sizeof(dma_addr_t);

  		break;
  	case 'p':
  	default:
  		num = *(const phys_addr_t *)addr;

  		size = sizeof(phys_addr_t);

  		break;
  	}

  	return special_hex_number(buf, end, num, size);

  }

  static noinline_for_stack

  char *date_str(char *buf, char *end, const struct rtc_time *tm, bool r)
  {
  	int year = tm->tm_year + (r ? 0 : 1900);
  	int mon = tm->tm_mon + (r ? 0 : 1);
  
  	buf = number(buf, end, year, default_dec04_spec);
  	if (buf < end)
  		*buf = '-';
  	buf++;
  
  	buf = number(buf, end, mon, default_dec02_spec);
  	if (buf < end)
  		*buf = '-';
  	buf++;
  
  	return number(buf, end, tm->tm_mday, default_dec02_spec);
  }
  
  static noinline_for_stack
  char *time_str(char *buf, char *end, const struct rtc_time *tm, bool r)
  {
  	buf = number(buf, end, tm->tm_hour, default_dec02_spec);
  	if (buf < end)
  		*buf = ':';
  	buf++;
  
  	buf = number(buf, end, tm->tm_min, default_dec02_spec);
  	if (buf < end)
  		*buf = ':';
  	buf++;
  
  	return number(buf, end, tm->tm_sec, default_dec02_spec);
  }
  
  static noinline_for_stack

  char *rtc_str(char *buf, char *end, const struct rtc_time *tm,
  	      struct printf_spec spec, const char *fmt)

  {
  	bool have_t = true, have_d = true;
  	bool raw = false;
  	int count = 2;

  	if (check_pointer(&buf, end, tm, spec))
  		return buf;

  	switch (fmt[count]) {
  	case 'd':
  		have_t = false;
  		count++;
  		break;
  	case 't':
  		have_d = false;
  		count++;
  		break;
  	}
  
  	raw = fmt[count] == 'r';
  
  	if (have_d)
  		buf = date_str(buf, end, tm, raw);
  	if (have_d && have_t) {
  		/* Respect ISO 8601 */
  		if (buf < end)
  			*buf = 'T';
  		buf++;
  	}
  	if (have_t)
  		buf = time_str(buf, end, tm, raw);
  
  	return buf;
  }
  
  static noinline_for_stack

  char *time64_str(char *buf, char *end, const time64_t time,
  		 struct printf_spec spec, const char *fmt)
  {
  	struct rtc_time rtc_time;
  	struct tm tm;
  
  	time64_to_tm(time, 0, &tm);
  
  	rtc_time.tm_sec = tm.tm_sec;
  	rtc_time.tm_min = tm.tm_min;
  	rtc_time.tm_hour = tm.tm_hour;
  	rtc_time.tm_mday = tm.tm_mday;
  	rtc_time.tm_mon = tm.tm_mon;
  	rtc_time.tm_year = tm.tm_year;
  	rtc_time.tm_wday = tm.tm_wday;
  	rtc_time.tm_yday = tm.tm_yday;
  
  	rtc_time.tm_isdst = 0;
  
  	return rtc_str(buf, end, &rtc_time, spec, fmt);
  }
  
  static noinline_for_stack

  char *time_and_date(char *buf, char *end, void *ptr, struct printf_spec spec,
  		    const char *fmt)
  {
  	switch (fmt[1]) {
  	case 'R':

  		return rtc_str(buf, end, (const struct rtc_time *)ptr, spec, fmt);

  	case 'T':
  		return time64_str(buf, end, *(const time64_t *)ptr, spec, fmt);

  	default:

  		return error_string(buf, end, "(%pt?)", spec);

  	}
  }
  
  static noinline_for_stack

  char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec,
  	    const char *fmt)
  {

  	if (!IS_ENABLED(CONFIG_HAVE_CLK))

  		return error_string(buf, end, "(%pC?)", spec);

  	if (check_pointer(&buf, end, clk, spec))
  		return buf;

  
  	switch (fmt[1]) {

  	case 'n':
  	default:
  #ifdef CONFIG_COMMON_CLK
  		return string(buf, end, __clk_get_name(clk), spec);
  #else

  		return ptr_to_id(buf, end, clk, spec);

  #endif
  	}
  }

  static
  char *format_flags(char *buf, char *end, unsigned long flags,
  					const struct trace_print_flags *names)
  {
  	unsigned long mask;

  
  	for ( ; flags && names->name; names++) {
  		mask = names->mask;
  		if ((flags & mask) != mask)
  			continue;

  		buf = string(buf, end, names->name, default_str_spec);

  
  		flags &= ~mask;
  		if (flags) {
  			if (buf < end)
  				*buf = '|';
  			buf++;
  		}
  	}
  
  	if (flags)

  		buf = number(buf, end, flags, default_flag_spec);

  
  	return buf;
  }
  
  static noinline_for_stack

  char *flags_string(char *buf, char *end, void *flags_ptr,
  		   struct printf_spec spec, const char *fmt)

  {
  	unsigned long flags;
  	const struct trace_print_flags *names;

  	if (check_pointer(&buf, end, flags_ptr, spec))
  		return buf;

  	switch (fmt[1]) {
  	case 'p':
  		flags = *(unsigned long *)flags_ptr;
  		/* Remove zone id */
  		flags &= (1UL << NR_PAGEFLAGS) - 1;
  		names = pageflag_names;
  		break;
  	case 'v':
  		flags = *(unsigned long *)flags_ptr;
  		names = vmaflag_names;
  		break;
  	case 'g':

  		flags = (__force unsigned long)(*(gfp_t *)flags_ptr);

  		names = gfpflag_names;
  		break;
  	default:

  		return error_string(buf, end, "(%pG?)", spec);

  	}
  
  	return format_flags(buf, end, flags, names);
  }

  static noinline_for_stack

  char *fwnode_full_name_string(struct fwnode_handle *fwnode, char *buf,
  			      char *end)

  {
  	int depth;

  	/* Loop starting from the root node to the current node. */
  	for (depth = fwnode_count_parents(fwnode); depth >= 0; depth--) {
  		struct fwnode_handle *__fwnode =
  			fwnode_get_nth_parent(fwnode, depth);

  		buf = string(buf, end, fwnode_get_name_prefix(__fwnode),

  			     default_str_spec);

  		buf = string(buf, end, fwnode_get_name(__fwnode),

  			     default_str_spec);

  
  		fwnode_handle_put(__fwnode);

  	}

  	return buf;
  }
  
  static noinline_for_stack
  char *device_node_string(char *buf, char *end, struct device_node *dn,
  			 struct printf_spec spec, const char *fmt)
  {
  	char tbuf[sizeof("xxxx") + 1];
  	const char *p;
  	int ret;
  	char *buf_start = buf;
  	struct property *prop;
  	bool has_mult, pass;

  
  	struct printf_spec str_spec = spec;
  	str_spec.field_width = -1;

  	if (fmt[0] != 'F')
  		return error_string(buf, end, "(%pO?)", spec);

  	if (!IS_ENABLED(CONFIG_OF))

  		return error_string(buf, end, "(%pOF?)", spec);

  	if (check_pointer(&buf, end, dn, spec))
  		return buf;

  
  	/* simple case without anything any more format specifiers */
  	fmt++;
  	if (fmt[0] == '\0' || strcspn(fmt,"fnpPFcC") > 0)
  		fmt = "f";
  
  	for (pass = false; strspn(fmt,"fnpPFcC"); fmt++, pass = true) {

  		int precision;

  		if (pass) {
  			if (buf < end)
  				*buf = ':';
  			buf++;
  		}
  
  		switch (*fmt) {
  		case 'f':	/* full_name */

  			buf = fwnode_full_name_string(of_fwnode_handle(dn), buf,
  						      end);

  			break;
  		case 'n':	/* name */

  			p = fwnode_get_name(of_fwnode_handle(dn));

  			precision = str_spec.precision;
  			str_spec.precision = strchrnul(p, '@') - p;
  			buf = string(buf, end, p, str_spec);
  			str_spec.precision = precision;

  			break;
  		case 'p':	/* phandle */

  			buf = number(buf, end, (unsigned int)dn->phandle, default_dec_spec);

  			break;
  		case 'P':	/* path-spec */

  			p = fwnode_get_name(of_fwnode_handle(dn));

  			if (!p[1])
  				p = "/";
  			buf = string(buf, end, p, str_spec);
  			break;
  		case 'F':	/* flags */
  			tbuf[0] = of_node_check_flag(dn, OF_DYNAMIC) ? 'D' : '-';
  			tbuf[1] = of_node_check_flag(dn, OF_DETACHED) ? 'd' : '-';
  			tbuf[2] = of_node_check_flag(dn, OF_POPULATED) ? 'P' : '-';
  			tbuf[3] = of_node_check_flag(dn, OF_POPULATED_BUS) ? 'B' : '-';
  			tbuf[4] = 0;

  			buf = string_nocheck(buf, end, tbuf, str_spec);

  			break;
  		case 'c':	/* major compatible string */
  			ret = of_property_read_string(dn, "compatible", &p);
  			if (!ret)
  				buf = string(buf, end, p, str_spec);
  			break;
  		case 'C':	/* full compatible string */
  			has_mult = false;
  			of_property_for_each_string(dn, "compatible", prop, p) {
  				if (has_mult)

  					buf = string_nocheck(buf, end, ",", str_spec);
  				buf = string_nocheck(buf, end, "\"", str_spec);

  				buf = string(buf, end, p, str_spec);

  				buf = string_nocheck(buf, end, "\"", str_spec);

  
  				has_mult = true;
  			}
  			break;
  		default:
  			break;
  		}
  	}
  
  	return widen_string(buf, buf - buf_start, end, spec);
  }

  static noinline_for_stack
  char *fwnode_string(char *buf, char *end, struct fwnode_handle *fwnode,
  		    struct printf_spec spec, const char *fmt)

  {

  	struct printf_spec str_spec = spec;
  	char *buf_start = buf;
  
  	str_spec.field_width = -1;
  
  	if (*fmt != 'w')
  		return error_string(buf, end, "(%pf?)", spec);
  
  	if (check_pointer(&buf, end, fwnode, spec))
  		return buf;
  
  	fmt++;
  
  	switch (*fmt) {
  	case 'P':	/* name */
  		buf = string(buf, end, fwnode_get_name(fwnode), str_spec);
  		break;
  	case 'f':	/* full_name */
  	default:
  		buf = fwnode_full_name_string(fwnode, buf, end);
  		break;

  	}

  	return widen_string(buf, buf - buf_start, end, spec);

  }

  /*
   * Show a '%p' thing.  A kernel extension is that the '%p' is followed
   * by an extra set of alphanumeric characters that are extended format
   * specifiers.
   *

   * Please update scripts/checkpatch.pl when adding/removing conversion
   * characters.  (Search for "check for vsprintf extension").
   *

   * Right now we handle:
   *

   * - 'S' For symbolic direct pointers (or function descriptors) with offset
   * - 's' For symbolic direct pointers (or function descriptors) without offset

   * - '[Ss]R' as above with __builtin_extract_return_addr() translation

   * - '[Ff]' %pf and %pF were obsoleted and later removed in favor of
   *	    %ps and %pS. Be careful when re-using these specifiers.

   * - 'B' For backtraced symbolic direct pointers with offset

   * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
   * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]

   * - 'b[l]' For a bitmap, the number of bits is determined by the field
   *       width which must be explicitly specified either as part of the
   *       format string '%32b[l]' or through '%*b[l]', [l] selects
   *       range-list format instead of hex format

   * - 'M' For a 6-byte MAC address, it prints the address in the
   *       usual colon-separated hex notation

   * - 'm' For a 6-byte MAC address, it prints the hex address without colons

   * - 'MF' For a 6-byte MAC FDDI address, it prints the address