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>
diff --git a/kernel/backtracetest.c b/kernel/backtracetest.c
index d1a7605..50f7abd 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 @@
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 @@
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 9c17fb9..6263e2d 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -562,6 +562,9 @@
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