Eric Lee / linux-smarc-t335x-v3.2

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Commit 8637c09901049f061b94f684915d4f18ecf91d79

Authored by Ingo Molnar
Committed by Linus Torvalds
1 parent f0a5c315eb
Exists in master and in 4 other branches v3.2_AM335xPSP_04.06.00.11, v3.2_NEWT335xPSP_04.06.00.11, v3.2_SBC_SMARTMEN, v3.2_SMARCT335xPSP_04.06.00.11

[PATCH] lockdep: stacktrace subsystem, core 

Framework to generate and save stacktraces quickly, without printing anything
to the console.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Showing 4 changed files with 50 additions and 1 deletions Side-by-side Diff

include/linux/stacktrace.h
Diff comments   View file @ 8637c09
  1 +#ifndef __LINUX_STACKTRACE_H
  2 +#define __LINUX_STACKTRACE_H
  3 +
  4 +#ifdef CONFIG_STACKTRACE
  5 +struct stack_trace {
  6 + unsigned int nr_entries, max_entries;
  7 + unsigned long *entries;
  8 +};
  9 +
  10 +extern void save_stack_trace(struct stack_trace *trace,
  11 + struct task_struct *task, int all_contexts,
  12 + unsigned int skip);
  13 +
  14 +extern void print_stack_trace(struct stack_trace *trace, int spaces);
  15 +#else
  16 +# define save_stack_trace(trace, task, all, skip) do { } while (0)
  17 +# define print_stack_trace(trace) do { } while (0)
  18 +#endif
  19 +
  20 +#endif
... ... @@ -10,6 +10,7 @@
10 10 kthread.o wait.o kfifo.o sys_ni.o posix-cpu-timers.o mutex.o \
11 11 hrtimer.o
12 12  
  13 +obj-$(CONFIG_STACKTRACE) += stacktrace.o
13 14 obj-y += time/
14 15 obj-$(CONFIG_DEBUG_MUTEXES) += mutex-debug.o
15 16 obj-$(CONFIG_FUTEX) += futex.o
  1 +/*
  2 + * kernel/stacktrace.c
  3 + *
  4 + * Stack trace management functions
  5 + *
  6 + * Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
  7 + */
  8 +#include <linux/sched.h>
  9 +#include <linux/kallsyms.h>
  10 +#include <linux/stacktrace.h>
  11 +
  12 +void print_stack_trace(struct stack_trace *trace, int spaces)
  13 +{
  14 + int i, j;
  15 +
  16 + for (i = 0; i < trace->nr_entries; i++) {
  17 + unsigned long ip = trace->entries[i];
  18 +
  19 + for (j = 0; j < spaces + 1; j++)
  20 + printk(" ");
  21 + print_ip_sym(ip);
  22 + }
  23 +}
... ... @@ -107,7 +107,7 @@
107 107  
108 108 config DEBUG_PREEMPT
109 109 bool "Debug preemptible kernel"
110   - depends on DEBUG_KERNEL && PREEMPT
  110 + depends on DEBUG_KERNEL && PREEMPT && TRACE_IRQFLAGS_SUPPORT
111 111 default y
112 112 help
113 113 If you say Y here then the kernel will use a debug variant of the
... ... @@ -148,6 +148,10 @@
148 148 help
149 149 If you say Y here, various routines which may sleep will become very
150 150 noisy if they are called with a spinlock held.
  151 +
  152 +config STACKTRACE
  153 + bool
  154 + depends on STACKTRACE_SUPPORT
151 155  
152 156 config DEBUG_KOBJECT
153 157 bool "kobject debugging"