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| author | Vegard Nossum <vegard.nossum@gmail.com> | 2008-06-27 18:04:48 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-06-27 18:09:15 +0200 |
| commit | ad118c54a3587b2c69a769d0ba37d4d8dce4559d (patch) | |
| tree | 779557f1734da19951e3d7d82167926bdaefd080 | |
| parent | a5a242dceed5d1c74fe46088762a9e4312c2d000 (diff) | |
| download | linux-ad118c54a3587b2c69a769d0ba37d4d8dce4559d.tar.bz2 | |
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: Vegard Nossum <vegard.nossum@gmail.com>
Cc: Arjan van de Ven <arjan@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | kernel/backtracetest.c | 30 | ||||
| -rw-r--r-- | lib/Kconfig.debug | 3 |
2 files changed, 32 insertions, 1 deletions
diff --git a/kernel/backtracetest.c b/kernel/backtracetest.c index d1a7605c5b8f..50f7abd0813d 100644 --- a/kernel/backtracetest.c +++ b/kernel/backtracetest.c @@ -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); diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 9c17fb9d1d5e..6263e2d851f1 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -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 |