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Commit ad118c54 authored by Vegard Nossum's avatar Vegard Nossum Committed by Ingo Molnar
Browse files

stacktrace: add saved stack traces to backtrace self-test 



This patch adds saved stack-traces to the backtrace suite of self-tests.

Note that we don't depend on or unconditionally enable CONFIG_STACKTRACE
because not all architectures may have it (and we still want to enable the
other tests for those architectures).

Cc: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: default avatarVegard Nossum <vegard.nossum@gmail.com>
Cc: Arjan van de Ven <arjan@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent a5a242dc

kernel/backtracetest.c

+29 −1
Original line number Diff line number Diff line
@@ -10,9 +10,10 @@ 
 * of the License.

 */



#include <linux/delay.h>

#include <linux/module.h>

#include <linux/sched.h>

#include <linux/delay.h>

#include <linux/stacktrace.h>



static struct timer_list backtrace_timer;
@@ -22,6 +23,31 @@ static void backtrace_test_timer(unsigned long data) 
	printk("The following trace is a kernel self test and not a bug!\n");

	dump_stack();

}



#ifdef CONFIG_STACKTRACE

static void backtrace_test_saved(void)

{

	struct stack_trace trace;

	unsigned long entries[8];



	printk("Testing a saved backtrace.\n");

	printk("The following trace is a kernel self test and not a bug!\n");



	trace.nr_entries = 0;

	trace.max_entries = ARRAY_SIZE(entries);

	trace.entries = entries;

	trace.skip = 0;



	save_stack_trace(&trace);

	print_stack_trace(&trace, 0);

}

#else

static void backtrace_test_saved(void)

{

	printk("Saved backtrace test skipped.\n");

}

#endif



static int backtrace_regression_test(void)

{

	printk("====[ backtrace testing ]===========\n");
@@ -29,6 +55,8 @@ static int backtrace_regression_test(void) 
	printk("The following trace is a kernel self test and not a bug!\n");

	dump_stack();



	backtrace_test_saved();



	init_timer(&backtrace_timer);

	backtrace_timer.function = backtrace_test_timer;

	mod_timer(&backtrace_timer, jiffies + 10);

lib/Kconfig.debug

+3 −0
Original line number Diff line number Diff line
@@ -562,6 +562,9 @@ config BACKTRACE_SELF_TEST 
	  for distributions or general kernels, but only for kernel

	  developers working on architecture code.



	  Note that if you want to also test saved backtraces, you will

	  have to enable STACKTRACE as well.



	  Say N if you are unsure.



config LKDTM