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Commit 8637c099 authored by Ingo Molnar's avatar Ingo Molnar Committed by Linus Torvalds
Browse files

[PATCH] lockdep: stacktrace subsystem, core 



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

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarArjan van de Ven <arjan@linux.intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent f0a5c315

include/linux/stacktrace.h

0 → 100644
+20 −0
Original line number Diff line number Diff line 
#ifndef __LINUX_STACKTRACE_H

#define __LINUX_STACKTRACE_H



#ifdef CONFIG_STACKTRACE

struct stack_trace {

	unsigned int nr_entries, max_entries;

	unsigned long *entries;

};



extern void save_stack_trace(struct stack_trace *trace,

			     struct task_struct *task, int all_contexts,

			     unsigned int skip);



extern void print_stack_trace(struct stack_trace *trace, int spaces);

#else

# define save_stack_trace(trace, task, all, skip)	do { } while (0)

# define print_stack_trace(trace)			do { } while (0)

#endif



#endif

kernel/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ obj-y = sched.o fork.o exec_domain.o panic.o printk.o profile.o \ 
	    kthread.o wait.o kfifo.o sys_ni.o posix-cpu-timers.o mutex.o \

	    hrtimer.o



obj-$(CONFIG_STACKTRACE) += stacktrace.o

obj-y += time/

obj-$(CONFIG_DEBUG_MUTEXES) += mutex-debug.o

obj-$(CONFIG_FUTEX) += futex.o

kernel/stacktrace.c

0 → 100644
+24 −0
Original line number Diff line number Diff line 
/*

 * kernel/stacktrace.c

 *

 * Stack trace management functions

 *

 *  Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>

 */

#include <linux/sched.h>

#include <linux/kallsyms.h>

#include <linux/stacktrace.h>



void print_stack_trace(struct stack_trace *trace, int spaces)

{

	int i, j;



	for (i = 0; i < trace->nr_entries; i++) {

		unsigned long ip = trace->entries[i];



		for (j = 0; j < spaces + 1; j++)

			printk(" ");

		print_ip_sym(ip);

	}

}

lib/Kconfig.debug

+5 −1
Original line number Diff line number Diff line
@@ -107,7 +107,7 @@ config DEBUG_SLAB_LEAK 


config DEBUG_PREEMPT

	bool "Debug preemptible kernel"

	depends on DEBUG_KERNEL && PREEMPT

	depends on DEBUG_KERNEL && PREEMPT && TRACE_IRQFLAGS_SUPPORT

	default y

	help

	  If you say Y here then the kernel will use a debug variant of the
@@ -149,6 +149,10 @@ config DEBUG_SPINLOCK_SLEEP 
	  If you say Y here, various routines which may sleep will become very

	  noisy if they are called with a spinlock held.



config STACKTRACE

	bool

	depends on STACKTRACE_SUPPORT



config DEBUG_KOBJECT

	bool "kobject debugging"

	depends on DEBUG_KERNEL