#ifndef __LINUX_PERCPU_H
  #define __LINUX_PERCPU_H

  #include <linux/preempt.h>

  #include <linux/smp.h>

  #include <linux/cpumask.h>

  #include <linux/pfn.h>

  #include <linux/init.h>

  #include <asm/percpu.h>

  /* enough to cover all DEFINE_PER_CPUs in modules */

  #ifdef CONFIG_MODULES

  #define PERCPU_MODULE_RESERVE		(8 << 10)

  #else

  #define PERCPU_MODULE_RESERVE		0

  #endif

  #ifndef PERCPU_ENOUGH_ROOM

  #define PERCPU_ENOUGH_ROOM						\

  	(ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES) +	\
  	 PERCPU_MODULE_RESERVE)
  #endif

  /*
   * Must be an lvalue. Since @var must be a simple identifier,
   * we force a syntax error here if it isn't.
   */
  #define get_cpu_var(var) (*({				\

  	preempt_disable();				\
  	&__get_cpu_var(var); }))

  /*
   * The weird & is necessary because sparse considers (void)(var) to be
   * a direct dereference of percpu variable (var).
   */

  #define put_cpu_var(var) do {				\

  	(void)&(var);					\

  	preempt_enable();				\
  } while (0)

  #define get_cpu_ptr(var) ({				\
  	preempt_disable();				\
  	this_cpu_ptr(var); })
  
  #define put_cpu_ptr(var) do {				\
  	(void)(var);					\
  	preempt_enable();				\
  } while (0)

  /* minimum unit size, also is the maximum supported allocation size */

  #define PCPU_MIN_UNIT_SIZE		PFN_ALIGN(32 << 10)

  
  /*

   * Percpu allocator can serve percpu allocations before slab is
   * initialized which allows slab to depend on the percpu allocator.
   * The following two parameters decide how much resource to
   * preallocate for this.  Keep PERCPU_DYNAMIC_RESERVE equal to or
   * larger than PERCPU_DYNAMIC_EARLY_SIZE.
   */
  #define PERCPU_DYNAMIC_EARLY_SLOTS	128
  #define PERCPU_DYNAMIC_EARLY_SIZE	(12 << 10)
  
  /*

   * PERCPU_DYNAMIC_RESERVE indicates the amount of free area to piggy

   * back on the first chunk for dynamic percpu allocation if arch is
   * manually allocating and mapping it for faster access (as a part of
   * large page mapping for example).

   *

   * The following values give between one and two pages of free space
   * after typical minimal boot (2-way SMP, single disk and NIC) with
   * both defconfig and a distro config on x86_64 and 32.  More
   * intelligent way to determine this would be nice.

   */

  #if BITS_PER_LONG > 32
  #define PERCPU_DYNAMIC_RESERVE		(20 << 10)
  #else
  #define PERCPU_DYNAMIC_RESERVE		(12 << 10)
  #endif

  extern void *pcpu_base_addr;

  extern const unsigned long *pcpu_unit_offsets;

  struct pcpu_group_info {
  	int			nr_units;	/* aligned # of units */
  	unsigned long		base_offset;	/* base address offset */
  	unsigned int		*cpu_map;	/* unit->cpu map, empty
  						 * entries contain NR_CPUS */
  };
  
  struct pcpu_alloc_info {
  	size_t			static_size;
  	size_t			reserved_size;
  	size_t			dyn_size;
  	size_t			unit_size;
  	size_t			atom_size;
  	size_t			alloc_size;
  	size_t			__ai_size;	/* internal, don't use */
  	int			nr_groups;	/* 0 if grouping unnecessary */
  	struct pcpu_group_info	groups[];
  };

  enum pcpu_fc {
  	PCPU_FC_AUTO,
  	PCPU_FC_EMBED,
  	PCPU_FC_PAGE,

  
  	PCPU_FC_NR,
  };
  extern const char *pcpu_fc_names[PCPU_FC_NR];
  
  extern enum pcpu_fc pcpu_chosen_fc;

  typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size,
  				     size_t align);

  typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size);
  typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr);

  typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to);

  extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups,
  							     int nr_units);
  extern void __init pcpu_free_alloc_info(struct pcpu_alloc_info *ai);

  extern int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
  					 void *base_addr);

  #ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK

  extern int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size,

  				size_t atom_size,
  				pcpu_fc_cpu_distance_fn_t cpu_distance_fn,
  				pcpu_fc_alloc_fn_t alloc_fn,
  				pcpu_fc_free_fn_t free_fn);

  #endif

  #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK

  extern int __init pcpu_page_first_chunk(size_t reserved_size,

  				pcpu_fc_alloc_fn_t alloc_fn,
  				pcpu_fc_free_fn_t free_fn,
  				pcpu_fc_populate_pte_fn_t populate_pte_fn);

  #endif

  /*
   * Use this to get to a cpu's version of the per-cpu object
   * dynamically allocated. Non-atomic access to the current CPU's
   * version should probably be combined with get_cpu()/put_cpu().
   */

  #ifdef CONFIG_SMP

  #define per_cpu_ptr(ptr, cpu)	SHIFT_PERCPU_PTR((ptr), per_cpu_offset((cpu)))

  #else
  #define per_cpu_ptr(ptr, cpu)	({ (void)(cpu); VERIFY_PERCPU_PTR((ptr)); })
  #endif

  extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align);

  extern bool is_kernel_percpu_address(unsigned long addr);

  #if !defined(CONFIG_SMP) || !defined(CONFIG_HAVE_SETUP_PER_CPU_AREA)

  extern void __init setup_per_cpu_areas(void);
  #endif

  extern void __init percpu_init_late(void);

  extern void __percpu *__alloc_percpu(size_t size, size_t align);
  extern void free_percpu(void __percpu *__pdata);
  extern phys_addr_t per_cpu_ptr_to_phys(void *addr);

  #define alloc_percpu(type)	\

  	(typeof(type) __percpu *)__alloc_percpu(sizeof(type), __alignof__(type))

  /*
   * Optional methods for optimized non-lvalue per-cpu variable access.
   *
   * @var can be a percpu variable or a field of it and its size should
   * equal char, int or long.  percpu_read() evaluates to a lvalue and
   * all others to void.
   *

   * These operations are guaranteed to be atomic.
   * The generic versions disable interrupts.  Archs are

   * encouraged to implement single-instruction alternatives which don't

   * require protection.

   */
  #ifndef percpu_read
  # define percpu_read(var)						\
    ({									\

  	typeof(var) *pr_ptr__ = &(var);					\
  	typeof(var) pr_ret__;						\
  	pr_ret__ = get_cpu_var(*pr_ptr__);				\
  	put_cpu_var(*pr_ptr__);						\
  	pr_ret__;							\

    })
  #endif
  
  #define __percpu_generic_to_op(var, val, op)				\
  do {									\

  	typeof(var) *pgto_ptr__ = &(var);				\
  	get_cpu_var(*pgto_ptr__) op val;				\
  	put_cpu_var(*pgto_ptr__);					\

  } while (0)
  
  #ifndef percpu_write
  # define percpu_write(var, val)		__percpu_generic_to_op(var, (val), =)
  #endif
  
  #ifndef percpu_add
  # define percpu_add(var, val)		__percpu_generic_to_op(var, (val), +=)
  #endif
  
  #ifndef percpu_sub
  # define percpu_sub(var, val)		__percpu_generic_to_op(var, (val), -=)
  #endif
  
  #ifndef percpu_and
  # define percpu_and(var, val)		__percpu_generic_to_op(var, (val), &=)
  #endif
  
  #ifndef percpu_or
  # define percpu_or(var, val)		__percpu_generic_to_op(var, (val), |=)
  #endif
  
  #ifndef percpu_xor
  # define percpu_xor(var, val)		__percpu_generic_to_op(var, (val), ^=)
  #endif

  /*
   * Branching function to split up a function into a set of functions that
   * are called for different scalar sizes of the objects handled.
   */
  
  extern void __bad_size_call_parameter(void);

  #define __pcpu_size_call_return(stem, variable)				\
  ({	typeof(variable) pscr_ret__;					\

  	__verify_pcpu_ptr(&(variable));					\

  	switch(sizeof(variable)) {					\

  	case 1: pscr_ret__ = stem##1(variable);break;			\
  	case 2: pscr_ret__ = stem##2(variable);break;			\
  	case 4: pscr_ret__ = stem##4(variable);break;			\
  	case 8: pscr_ret__ = stem##8(variable);break;			\

  	default:							\
  		__bad_size_call_parameter();break;			\
  	}								\

  	pscr_ret__;							\

  })

  #define __pcpu_size_call_return2(stem, variable, ...)			\
  ({									\
  	typeof(variable) pscr2_ret__;					\
  	__verify_pcpu_ptr(&(variable));					\
  	switch(sizeof(variable)) {					\
  	case 1: pscr2_ret__ = stem##1(variable, __VA_ARGS__); break;	\
  	case 2: pscr2_ret__ = stem##2(variable, __VA_ARGS__); break;	\
  	case 4: pscr2_ret__ = stem##4(variable, __VA_ARGS__); break;	\
  	case 8: pscr2_ret__ = stem##8(variable, __VA_ARGS__); break;	\
  	default:							\
  		__bad_size_call_parameter(); break;			\
  	}								\
  	pscr2_ret__;							\
  })

  /*
   * Special handling for cmpxchg_double.  cmpxchg_double is passed two
   * percpu variables.  The first has to be aligned to a double word
   * boundary and the second has to follow directly thereafter.

   * We enforce this on all architectures even if they don't support
   * a double cmpxchg instruction, since it's a cheap requirement, and it
   * avoids breaking the requirement for architectures with the instruction.

   */
  #define __pcpu_double_call_return_bool(stem, pcp1, pcp2, ...)		\
  ({									\
  	bool pdcrb_ret__;						\
  	__verify_pcpu_ptr(&pcp1);					\
  	BUILD_BUG_ON(sizeof(pcp1) != sizeof(pcp2));			\
  	VM_BUG_ON((unsigned long)(&pcp1) % (2 * sizeof(pcp1)));		\
  	VM_BUG_ON((unsigned long)(&pcp2) !=				\
  		  (unsigned long)(&pcp1) + sizeof(pcp1));		\
  	switch(sizeof(pcp1)) {						\
  	case 1: pdcrb_ret__ = stem##1(pcp1, pcp2, __VA_ARGS__); break;	\
  	case 2: pdcrb_ret__ = stem##2(pcp1, pcp2, __VA_ARGS__); break;	\
  	case 4: pdcrb_ret__ = stem##4(pcp1, pcp2, __VA_ARGS__); break;	\
  	case 8: pdcrb_ret__ = stem##8(pcp1, pcp2, __VA_ARGS__); break;	\
  	default:							\
  		__bad_size_call_parameter(); break;			\
  	}								\
  	pdcrb_ret__;							\
  })

  #define __pcpu_size_call(stem, variable, ...)				\

  do {									\

  	__verify_pcpu_ptr(&(variable));					\

  	switch(sizeof(variable)) {					\
  		case 1: stem##1(variable, __VA_ARGS__);break;		\
  		case 2: stem##2(variable, __VA_ARGS__);break;		\
  		case 4: stem##4(variable, __VA_ARGS__);break;		\
  		case 8: stem##8(variable, __VA_ARGS__);break;		\
  		default: 						\
  			__bad_size_call_parameter();break;		\
  	}								\
  } while (0)
  
  /*
   * Optimized manipulation for memory allocated through the per cpu

   * allocator or for addresses of per cpu variables.

   *
   * These operation guarantee exclusivity of access for other operations
   * on the *same* processor. The assumption is that per cpu data is only
   * accessed by a single processor instance (the current one).
   *
   * The first group is used for accesses that must be done in a
   * preemption safe way since we know that the context is not preempt
   * safe. Interrupts may occur. If the interrupt modifies the variable
   * too then RMW actions will not be reliable.
   *
   * The arch code can provide optimized functions in two ways:
   *
   * 1. Override the function completely. F.e. define this_cpu_add().
   *    The arch must then ensure that the various scalar format passed
   *    are handled correctly.
   *
   * 2. Provide functions for certain scalar sizes. F.e. provide
   *    this_cpu_add_2() to provide per cpu atomic operations for 2 byte
   *    sized RMW actions. If arch code does not provide operations for
   *    a scalar size then the fallback in the generic code will be
   *    used.
   */
  
  #define _this_cpu_generic_read(pcp)					\
  ({	typeof(pcp) ret__;						\
  	preempt_disable();						\
  	ret__ = *this_cpu_ptr(&(pcp));					\
  	preempt_enable();						\
  	ret__;								\
  })
  
  #ifndef this_cpu_read
  # ifndef this_cpu_read_1
  #  define this_cpu_read_1(pcp)	_this_cpu_generic_read(pcp)
  # endif
  # ifndef this_cpu_read_2
  #  define this_cpu_read_2(pcp)	_this_cpu_generic_read(pcp)
  # endif
  # ifndef this_cpu_read_4
  #  define this_cpu_read_4(pcp)	_this_cpu_generic_read(pcp)
  # endif
  # ifndef this_cpu_read_8
  #  define this_cpu_read_8(pcp)	_this_cpu_generic_read(pcp)
  # endif

  # define this_cpu_read(pcp)	__pcpu_size_call_return(this_cpu_read_, (pcp))

  #endif
  
  #define _this_cpu_generic_to_op(pcp, val, op)				\
  do {									\

  	unsigned long flags;						\
  	local_irq_save(flags);						\

  	*__this_cpu_ptr(&(pcp)) op val;					\

  	local_irq_restore(flags);					\

  } while (0)
  
  #ifndef this_cpu_write
  # ifndef this_cpu_write_1
  #  define this_cpu_write_1(pcp, val)	_this_cpu_generic_to_op((pcp), (val), =)
  # endif
  # ifndef this_cpu_write_2
  #  define this_cpu_write_2(pcp, val)	_this_cpu_generic_to_op((pcp), (val), =)
  # endif
  # ifndef this_cpu_write_4
  #  define this_cpu_write_4(pcp, val)	_this_cpu_generic_to_op((pcp), (val), =)
  # endif
  # ifndef this_cpu_write_8
  #  define this_cpu_write_8(pcp, val)	_this_cpu_generic_to_op((pcp), (val), =)
  # endif

  # define this_cpu_write(pcp, val)	__pcpu_size_call(this_cpu_write_, (pcp), (val))

  #endif
  
  #ifndef this_cpu_add
  # ifndef this_cpu_add_1
  #  define this_cpu_add_1(pcp, val)	_this_cpu_generic_to_op((pcp), (val), +=)
  # endif
  # ifndef this_cpu_add_2
  #  define this_cpu_add_2(pcp, val)	_this_cpu_generic_to_op((pcp), (val), +=)
  # endif
  # ifndef this_cpu_add_4
  #  define this_cpu_add_4(pcp, val)	_this_cpu_generic_to_op((pcp), (val), +=)
  # endif
  # ifndef this_cpu_add_8
  #  define this_cpu_add_8(pcp, val)	_this_cpu_generic_to_op((pcp), (val), +=)
  # endif

  # define this_cpu_add(pcp, val)		__pcpu_size_call(this_cpu_add_, (pcp), (val))

  #endif
  
  #ifndef this_cpu_sub
  # define this_cpu_sub(pcp, val)		this_cpu_add((pcp), -(val))
  #endif
  
  #ifndef this_cpu_inc
  # define this_cpu_inc(pcp)		this_cpu_add((pcp), 1)
  #endif
  
  #ifndef this_cpu_dec
  # define this_cpu_dec(pcp)		this_cpu_sub((pcp), 1)
  #endif
  
  #ifndef this_cpu_and
  # ifndef this_cpu_and_1
  #  define this_cpu_and_1(pcp, val)	_this_cpu_generic_to_op((pcp), (val), &=)
  # endif
  # ifndef this_cpu_and_2
  #  define this_cpu_and_2(pcp, val)	_this_cpu_generic_to_op((pcp), (val), &=)
  # endif
  # ifndef this_cpu_and_4
  #  define this_cpu_and_4(pcp, val)	_this_cpu_generic_to_op((pcp), (val), &=)
  # endif
  # ifndef this_cpu_and_8
  #  define this_cpu_and_8(pcp, val)	_this_cpu_generic_to_op((pcp), (val), &=)
  # endif

  # define this_cpu_and(pcp, val)		__pcpu_size_call(this_cpu_and_, (pcp), (val))

  #endif
  
  #ifndef this_cpu_or
  # ifndef this_cpu_or_1
  #  define this_cpu_or_1(pcp, val)	_this_cpu_generic_to_op((pcp), (val), |=)
  # endif
  # ifndef this_cpu_or_2
  #  define this_cpu_or_2(pcp, val)	_this_cpu_generic_to_op((pcp), (val), |=)
  # endif
  # ifndef this_cpu_or_4
  #  define this_cpu_or_4(pcp, val)	_this_cpu_generic_to_op((pcp), (val), |=)
  # endif
  # ifndef this_cpu_or_8
  #  define this_cpu_or_8(pcp, val)	_this_cpu_generic_to_op((pcp), (val), |=)
  # endif

  # define this_cpu_or(pcp, val)		__pcpu_size_call(this_cpu_or_, (pcp), (val))

  #endif
  
  #ifndef this_cpu_xor
  # ifndef this_cpu_xor_1
  #  define this_cpu_xor_1(pcp, val)	_this_cpu_generic_to_op((pcp), (val), ^=)
  # endif
  # ifndef this_cpu_xor_2
  #  define this_cpu_xor_2(pcp, val)	_this_cpu_generic_to_op((pcp), (val), ^=)
  # endif
  # ifndef this_cpu_xor_4
  #  define this_cpu_xor_4(pcp, val)	_this_cpu_generic_to_op((pcp), (val), ^=)
  # endif
  # ifndef this_cpu_xor_8
  #  define this_cpu_xor_8(pcp, val)	_this_cpu_generic_to_op((pcp), (val), ^=)
  # endif

  # define this_cpu_xor(pcp, val)		__pcpu_size_call(this_cpu_or_, (pcp), (val))

  #endif

  #define _this_cpu_generic_add_return(pcp, val)				\
  ({									\
  	typeof(pcp) ret__;						\

  	unsigned long flags;						\
  	local_irq_save(flags);						\

  	__this_cpu_add(pcp, val);					\
  	ret__ = __this_cpu_read(pcp);					\

  	local_irq_restore(flags);					\

  	ret__;								\
  })
  
  #ifndef this_cpu_add_return
  # ifndef this_cpu_add_return_1
  #  define this_cpu_add_return_1(pcp, val)	_this_cpu_generic_add_return(pcp, val)
  # endif
  # ifndef this_cpu_add_return_2
  #  define this_cpu_add_return_2(pcp, val)	_this_cpu_generic_add_return(pcp, val)
  # endif
  # ifndef this_cpu_add_return_4
  #  define this_cpu_add_return_4(pcp, val)	_this_cpu_generic_add_return(pcp, val)
  # endif
  # ifndef this_cpu_add_return_8
  #  define this_cpu_add_return_8(pcp, val)	_this_cpu_generic_add_return(pcp, val)
  # endif
  # define this_cpu_add_return(pcp, val)	__pcpu_size_call_return2(this_cpu_add_return_, pcp, val)
  #endif
  
  #define this_cpu_sub_return(pcp, val)	this_cpu_add_return(pcp, -(val))
  #define this_cpu_inc_return(pcp)	this_cpu_add_return(pcp, 1)
  #define this_cpu_dec_return(pcp)	this_cpu_add_return(pcp, -1)

  #define _this_cpu_generic_xchg(pcp, nval)				\
  ({	typeof(pcp) ret__;						\

  	unsigned long flags;						\
  	local_irq_save(flags);						\

  	ret__ = __this_cpu_read(pcp);					\
  	__this_cpu_write(pcp, nval);					\

  	local_irq_restore(flags);					\

  	ret__;								\
  })
  
  #ifndef this_cpu_xchg
  # ifndef this_cpu_xchg_1
  #  define this_cpu_xchg_1(pcp, nval)	_this_cpu_generic_xchg(pcp, nval)
  # endif
  # ifndef this_cpu_xchg_2
  #  define this_cpu_xchg_2(pcp, nval)	_this_cpu_generic_xchg(pcp, nval)
  # endif
  # ifndef this_cpu_xchg_4
  #  define this_cpu_xchg_4(pcp, nval)	_this_cpu_generic_xchg(pcp, nval)
  # endif
  # ifndef this_cpu_xchg_8
  #  define this_cpu_xchg_8(pcp, nval)	_this_cpu_generic_xchg(pcp, nval)
  # endif
  # define this_cpu_xchg(pcp, nval)	\
  	__pcpu_size_call_return2(this_cpu_xchg_, (pcp), nval)
  #endif
  
  #define _this_cpu_generic_cmpxchg(pcp, oval, nval)			\

  ({									\
  	typeof(pcp) ret__;						\
  	unsigned long flags;						\
  	local_irq_save(flags);						\

  	ret__ = __this_cpu_read(pcp);					\
  	if (ret__ == (oval))						\
  		__this_cpu_write(pcp, nval);				\

  	local_irq_restore(flags);					\

  	ret__;								\
  })
  
  #ifndef this_cpu_cmpxchg
  # ifndef this_cpu_cmpxchg_1
  #  define this_cpu_cmpxchg_1(pcp, oval, nval)	_this_cpu_generic_cmpxchg(pcp, oval, nval)
  # endif
  # ifndef this_cpu_cmpxchg_2
  #  define this_cpu_cmpxchg_2(pcp, oval, nval)	_this_cpu_generic_cmpxchg(pcp, oval, nval)
  # endif
  # ifndef this_cpu_cmpxchg_4
  #  define this_cpu_cmpxchg_4(pcp, oval, nval)	_this_cpu_generic_cmpxchg(pcp, oval, nval)
  # endif
  # ifndef this_cpu_cmpxchg_8
  #  define this_cpu_cmpxchg_8(pcp, oval, nval)	_this_cpu_generic_cmpxchg(pcp, oval, nval)
  # endif
  # define this_cpu_cmpxchg(pcp, oval, nval)	\
  	__pcpu_size_call_return2(this_cpu_cmpxchg_, pcp, oval, nval)
  #endif

  /*

   * cmpxchg_double replaces two adjacent scalars at once.  The first
   * two parameters are per cpu variables which have to be of the same
   * size.  A truth value is returned to indicate success or failure
   * (since a double register result is difficult to handle).  There is
   * very limited hardware support for these operations, so only certain
   * sizes may work.
   */
  #define _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)	\
  ({									\
  	int ret__;							\

  	unsigned long flags;						\
  	local_irq_save(flags);						\

  	ret__ = __this_cpu_generic_cmpxchg_double(pcp1, pcp2,		\
  			oval1, oval2, nval1, nval2);			\

  	local_irq_restore(flags);					\

  	ret__;								\
  })
  
  #ifndef this_cpu_cmpxchg_double
  # ifndef this_cpu_cmpxchg_double_1
  #  define this_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2)	\
  	_this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
  # endif
  # ifndef this_cpu_cmpxchg_double_2
  #  define this_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2)	\
  	_this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
  # endif
  # ifndef this_cpu_cmpxchg_double_4
  #  define this_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2)	\
  	_this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
  # endif
  # ifndef this_cpu_cmpxchg_double_8
  #  define this_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2)	\
  	_this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
  # endif
  # define this_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)	\
  	__pcpu_double_call_return_bool(this_cpu_cmpxchg_double_, (pcp1), (pcp2), (oval1), (oval2), (nval1), (nval2))
  #endif
  
  /*

   * Generic percpu operations for context that are safe from preemption/interrupts.

   * Either we do not care about races or the caller has the

   * responsibility of handling preemption/interrupt issues. Arch code can still

   * override these instructions since the arch per cpu code may be more
   * efficient and may actually get race freeness for free (that is the
   * case for x86 for example).
   *
   * If there is no other protection through preempt disable and/or
   * disabling interupts then one of these RMW operations can show unexpected
   * behavior because the execution thread was rescheduled on another processor
   * or an interrupt occurred and the same percpu variable was modified from
   * the interrupt context.
   */
  #ifndef __this_cpu_read
  # ifndef __this_cpu_read_1
  #  define __this_cpu_read_1(pcp)	(*__this_cpu_ptr(&(pcp)))
  # endif
  # ifndef __this_cpu_read_2
  #  define __this_cpu_read_2(pcp)	(*__this_cpu_ptr(&(pcp)))
  # endif
  # ifndef __this_cpu_read_4
  #  define __this_cpu_read_4(pcp)	(*__this_cpu_ptr(&(pcp)))
  # endif
  # ifndef __this_cpu_read_8
  #  define __this_cpu_read_8(pcp)	(*__this_cpu_ptr(&(pcp)))
  # endif

  # define __this_cpu_read(pcp)	__pcpu_size_call_return(__this_cpu_read_, (pcp))

  #endif
  
  #define __this_cpu_generic_to_op(pcp, val, op)				\
  do {									\
  	*__this_cpu_ptr(&(pcp)) op val;					\
  } while (0)
  
  #ifndef __this_cpu_write
  # ifndef __this_cpu_write_1
  #  define __this_cpu_write_1(pcp, val)	__this_cpu_generic_to_op((pcp), (val), =)
  # endif
  # ifndef __this_cpu_write_2
  #  define __this_cpu_write_2(pcp, val)	__this_cpu_generic_to_op((pcp), (val), =)
  # endif
  # ifndef __this_cpu_write_4
  #  define __this_cpu_write_4(pcp, val)	__this_cpu_generic_to_op((pcp), (val), =)
  # endif
  # ifndef __this_cpu_write_8
  #  define __this_cpu_write_8(pcp, val)	__this_cpu_generic_to_op((pcp), (val), =)
  # endif

  # define __this_cpu_write(pcp, val)	__pcpu_size_call(__this_cpu_write_, (pcp), (val))

  #endif
  
  #ifndef __this_cpu_add
  # ifndef __this_cpu_add_1
  #  define __this_cpu_add_1(pcp, val)	__this_cpu_generic_to_op((pcp), (val), +=)
  # endif
  # ifndef __this_cpu_add_2
  #  define __this_cpu_add_2(pcp, val)	__this_cpu_generic_to_op((pcp), (val), +=)
  # endif
  # ifndef __this_cpu_add_4
  #  define __this_cpu_add_4(pcp, val)	__this_cpu_generic_to_op((pcp), (val), +=)
  # endif
  # ifndef __this_cpu_add_8
  #  define __this_cpu_add_8(pcp, val)	__this_cpu_generic_to_op((pcp), (val), +=)
  # endif

  # define __this_cpu_add(pcp, val)	__pcpu_size_call(__this_cpu_add_, (pcp), (val))

  #endif
  
  #ifndef __this_cpu_sub
  # define __this_cpu_sub(pcp, val)	__this_cpu_add((pcp), -(val))
  #endif
  
  #ifndef __this_cpu_inc
  # define __this_cpu_inc(pcp)		__this_cpu_add((pcp), 1)
  #endif
  
  #ifndef __this_cpu_dec
  # define __this_cpu_dec(pcp)		__this_cpu_sub((pcp), 1)
  #endif
  
  #ifndef __this_cpu_and
  # ifndef __this_cpu_and_1
  #  define __this_cpu_and_1(pcp, val)	__this_cpu_generic_to_op((pcp), (val), &=)
  # endif
  # ifndef __this_cpu_and_2
  #  define __this_cpu_and_2(pcp, val)	__this_cpu_generic_to_op((pcp), (val), &=)
  # endif
  # ifndef __this_cpu_and_4
  #  define __this_cpu_and_4(pcp, val)	__this_cpu_generic_to_op((pcp), (val), &=)
  # endif
  # ifndef __this_cpu_and_8
  #  define __this_cpu_and_8(pcp, val)	__this_cpu_generic_to_op((pcp), (val), &=)
  # endif

  # define __this_cpu_and(pcp, val)	__pcpu_size_call(__this_cpu_and_, (pcp), (val))

  #endif
  
  #ifndef __this_cpu_or
  # ifndef __this_cpu_or_1
  #  define __this_cpu_or_1(pcp, val)	__this_cpu_generic_to_op((pcp), (val), |=)
  # endif
  # ifndef __this_cpu_or_2
  #  define __this_cpu_or_2(pcp, val)	__this_cpu_generic_to_op((pcp), (val), |=)
  # endif
  # ifndef __this_cpu_or_4
  #  define __this_cpu_or_4(pcp, val)	__this_cpu_generic_to_op((pcp), (val), |=)
  # endif
  # ifndef __this_cpu_or_8
  #  define __this_cpu_or_8(pcp, val)	__this_cpu_generic_to_op((pcp), (val), |=)
  # endif

  # define __this_cpu_or(pcp, val)	__pcpu_size_call(__this_cpu_or_, (pcp), (val))

  #endif
  
  #ifndef __this_cpu_xor
  # ifndef __this_cpu_xor_1
  #  define __this_cpu_xor_1(pcp, val)	__this_cpu_generic_to_op((pcp), (val), ^=)
  # endif
  # ifndef __this_cpu_xor_2
  #  define __this_cpu_xor_2(pcp, val)	__this_cpu_generic_to_op((pcp), (val), ^=)
  # endif
  # ifndef __this_cpu_xor_4
  #  define __this_cpu_xor_4(pcp, val)	__this_cpu_generic_to_op((pcp), (val), ^=)
  # endif
  # ifndef __this_cpu_xor_8
  #  define __this_cpu_xor_8(pcp, val)	__this_cpu_generic_to_op((pcp), (val), ^=)
  # endif

  # define __this_cpu_xor(pcp, val)	__pcpu_size_call(__this_cpu_xor_, (pcp), (val))

  #endif

  #define __this_cpu_generic_add_return(pcp, val)				\
  ({									\
  	__this_cpu_add(pcp, val);					\
  	__this_cpu_read(pcp);						\
  })
  
  #ifndef __this_cpu_add_return
  # ifndef __this_cpu_add_return_1
  #  define __this_cpu_add_return_1(pcp, val)	__this_cpu_generic_add_return(pcp, val)
  # endif
  # ifndef __this_cpu_add_return_2
  #  define __this_cpu_add_return_2(pcp, val)	__this_cpu_generic_add_return(pcp, val)
  # endif
  # ifndef __this_cpu_add_return_4
  #  define __this_cpu_add_return_4(pcp, val)	__this_cpu_generic_add_return(pcp, val)
  # endif
  # ifndef __this_cpu_add_return_8
  #  define __this_cpu_add_return_8(pcp, val)	__this_cpu_generic_add_return(pcp, val)
  # endif
  # define __this_cpu_add_return(pcp, val)	__pcpu_size_call_return2(this_cpu_add_return_, pcp, val)
  #endif
  
  #define __this_cpu_sub_return(pcp, val)	this_cpu_add_return(pcp, -(val))
  #define __this_cpu_inc_return(pcp)	this_cpu_add_return(pcp, 1)
  #define __this_cpu_dec_return(pcp)	this_cpu_add_return(pcp, -1)

  #define __this_cpu_generic_xchg(pcp, nval)				\
  ({	typeof(pcp) ret__;						\
  	ret__ = __this_cpu_read(pcp);					\
  	__this_cpu_write(pcp, nval);					\
  	ret__;								\
  })
  
  #ifndef __this_cpu_xchg
  # ifndef __this_cpu_xchg_1
  #  define __this_cpu_xchg_1(pcp, nval)	__this_cpu_generic_xchg(pcp, nval)
  # endif
  # ifndef __this_cpu_xchg_2
  #  define __this_cpu_xchg_2(pcp, nval)	__this_cpu_generic_xchg(pcp, nval)
  # endif
  # ifndef __this_cpu_xchg_4
  #  define __this_cpu_xchg_4(pcp, nval)	__this_cpu_generic_xchg(pcp, nval)
  # endif
  # ifndef __this_cpu_xchg_8
  #  define __this_cpu_xchg_8(pcp, nval)	__this_cpu_generic_xchg(pcp, nval)
  # endif
  # define __this_cpu_xchg(pcp, nval)	\
  	__pcpu_size_call_return2(__this_cpu_xchg_, (pcp), nval)
  #endif
  
  #define __this_cpu_generic_cmpxchg(pcp, oval, nval)			\
  ({									\
  	typeof(pcp) ret__;						\
  	ret__ = __this_cpu_read(pcp);					\
  	if (ret__ == (oval))						\
  		__this_cpu_write(pcp, nval);				\
  	ret__;								\
  })
  
  #ifndef __this_cpu_cmpxchg
  # ifndef __this_cpu_cmpxchg_1
  #  define __this_cpu_cmpxchg_1(pcp, oval, nval)	__this_cpu_generic_cmpxchg(pcp, oval, nval)
  # endif
  # ifndef __this_cpu_cmpxchg_2
  #  define __this_cpu_cmpxchg_2(pcp, oval, nval)	__this_cpu_generic_cmpxchg(pcp, oval, nval)
  # endif
  # ifndef __this_cpu_cmpxchg_4
  #  define __this_cpu_cmpxchg_4(pcp, oval, nval)	__this_cpu_generic_cmpxchg(pcp, oval, nval)
  # endif
  # ifndef __this_cpu_cmpxchg_8
  #  define __this_cpu_cmpxchg_8(pcp, oval, nval)	__this_cpu_generic_cmpxchg(pcp, oval, nval)
  # endif
  # define __this_cpu_cmpxchg(pcp, oval, nval)	\
  	__pcpu_size_call_return2(__this_cpu_cmpxchg_, pcp, oval, nval)
  #endif

  #define __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)	\
  ({									\
  	int __ret = 0;							\
  	if (__this_cpu_read(pcp1) == (oval1) &&				\
  			 __this_cpu_read(pcp2)  == (oval2)) {		\
  		__this_cpu_write(pcp1, (nval1));			\
  		__this_cpu_write(pcp2, (nval2));			\
  		__ret = 1;						\
  	}								\
  	(__ret);							\
  })
  
  #ifndef __this_cpu_cmpxchg_double
  # ifndef __this_cpu_cmpxchg_double_1
  #  define __this_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2)	\
  	__this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
  # endif
  # ifndef __this_cpu_cmpxchg_double_2
  #  define __this_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2)	\
  	__this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
  # endif
  # ifndef __this_cpu_cmpxchg_double_4
  #  define __this_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2)	\
  	__this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
  # endif
  # ifndef __this_cpu_cmpxchg_double_8
  #  define __this_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2)	\
  	__this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
  # endif
  # define __this_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)	\
  	__pcpu_double_call_return_bool(__this_cpu_cmpxchg_double_, (pcp1), (pcp2), (oval1), (oval2), (nval1), (nval2))
  #endif

  #endif /* __LINUX_PERCPU_H */