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-rw-r--r--arch/arm/kernel/stacktrace.c1
-rw-r--r--arch/avr32/kernel/stacktrace.c1
-rw-r--r--arch/mips/kernel/stacktrace.c1
-rw-r--r--arch/powerpc/kernel/stacktrace.c2
-rw-r--r--arch/s390/kernel/stacktrace.c2
-rw-r--r--arch/sh/kernel/stacktrace.c1
-rw-r--r--arch/sparc64/kernel/stacktrace.c2
-rw-r--r--arch/x86/kernel/stacktrace.c2
-rw-r--r--kernel/backtracetest.c65
-rw-r--r--kernel/stacktrace.c14
-rw-r--r--lib/Kconfig.debug4
11 files changed, 77 insertions, 18 deletions
diff --git a/arch/arm/kernel/stacktrace.c b/arch/arm/kernel/stacktrace.c
index 90e0c35..fc650f6 100644
--- a/arch/arm/kernel/stacktrace.c
+++ b/arch/arm/kernel/stacktrace.c
@@ -92,4 +92,5 @@ void save_stack_trace(struct stack_trace *trace)
{
save_stack_trace_tsk(current, trace);
}
+EXPORT_SYMBOL_GPL(save_stack_trace);
#endif
diff --git a/arch/avr32/kernel/stacktrace.c b/arch/avr32/kernel/stacktrace.c
index 9a68190..f4bdb44 100644
--- a/arch/avr32/kernel/stacktrace.c
+++ b/arch/avr32/kernel/stacktrace.c
@@ -51,3 +51,4 @@ void save_stack_trace(struct stack_trace *trace)
fp = frame->fp;
}
}
+EXPORT_SYMBOL_GPL(save_stack_trace);
diff --git a/arch/mips/kernel/stacktrace.c b/arch/mips/kernel/stacktrace.c
index ebd9db8..5eb4681 100644
--- a/arch/mips/kernel/stacktrace.c
+++ b/arch/mips/kernel/stacktrace.c
@@ -73,3 +73,4 @@ void save_stack_trace(struct stack_trace *trace)
prepare_frametrace(regs);
save_context_stack(trace, regs);
}
+EXPORT_SYMBOL_GPL(save_stack_trace);
diff --git a/arch/powerpc/kernel/stacktrace.c b/arch/powerpc/kernel/stacktrace.c
index 9629440..3cf0d94 100644
--- a/arch/powerpc/kernel/stacktrace.c
+++ b/arch/powerpc/kernel/stacktrace.c
@@ -12,6 +12,7 @@
#include <linux/sched.h>
#include <linux/stacktrace.h>
+#include <linux/module.h>
#include <asm/ptrace.h>
/*
@@ -44,3 +45,4 @@ void save_stack_trace(struct stack_trace *trace)
sp = newsp;
}
}
+EXPORT_SYMBOL_GPL(save_stack_trace);
diff --git a/arch/s390/kernel/stacktrace.c b/arch/s390/kernel/stacktrace.c
index 85e46a5..57571f1 100644
--- a/arch/s390/kernel/stacktrace.c
+++ b/arch/s390/kernel/stacktrace.c
@@ -81,6 +81,7 @@ void save_stack_trace(struct stack_trace *trace)
S390_lowcore.thread_info,
S390_lowcore.thread_info + THREAD_SIZE, 1);
}
+EXPORT_SYMBOL_GPL(save_stack_trace);
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
{
@@ -93,3 +94,4 @@ void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = ULONG_MAX;
}
+EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
diff --git a/arch/sh/kernel/stacktrace.c b/arch/sh/kernel/stacktrace.c
index d41e561..1b2ae35 100644
--- a/arch/sh/kernel/stacktrace.c
+++ b/arch/sh/kernel/stacktrace.c
@@ -34,3 +34,4 @@ void save_stack_trace(struct stack_trace *trace)
}
}
}
+EXPORT_SYMBOL_GPL(save_stack_trace);
diff --git a/arch/sparc64/kernel/stacktrace.c b/arch/sparc64/kernel/stacktrace.c
index c73ce3f..b3e3737 100644
--- a/arch/sparc64/kernel/stacktrace.c
+++ b/arch/sparc64/kernel/stacktrace.c
@@ -1,6 +1,7 @@
#include <linux/sched.h>
#include <linux/stacktrace.h>
#include <linux/thread_info.h>
+#include <linux/module.h>
#include <asm/ptrace.h>
#include <asm/stacktrace.h>
@@ -47,3 +48,4 @@ void save_stack_trace(struct stack_trace *trace)
trace->entries[trace->nr_entries++] = pc;
} while (trace->nr_entries < trace->max_entries);
}
+EXPORT_SYMBOL_GPL(save_stack_trace);
diff --git a/arch/x86/kernel/stacktrace.c b/arch/x86/kernel/stacktrace.c
index c28c342..a03e7f6 100644
--- a/arch/x86/kernel/stacktrace.c
+++ b/arch/x86/kernel/stacktrace.c
@@ -74,6 +74,7 @@ void save_stack_trace(struct stack_trace *trace)
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = ULONG_MAX;
}
+EXPORT_SYMBOL_GPL(save_stack_trace);
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
{
@@ -81,3 +82,4 @@ void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = ULONG_MAX;
}
+EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
diff --git a/kernel/backtracetest.c b/kernel/backtracetest.c
index d1a7605..a5e026b 100644
--- a/kernel/backtracetest.c
+++ b/kernel/backtracetest.c
@@ -10,30 +10,73 @@
* of the License.
*/
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/sched.h>
-#include <linux/delay.h>
+#include <linux/stacktrace.h>
+
+static void backtrace_test_normal(void)
+{
+ printk("Testing a backtrace from process context.\n");
+ printk("The following trace is a kernel self test and not a bug!\n");
-static struct timer_list backtrace_timer;
+ dump_stack();
+}
-static void backtrace_test_timer(unsigned long data)
+static DECLARE_COMPLETION(backtrace_work);
+
+static void backtrace_test_irq_callback(unsigned long data)
+{
+ dump_stack();
+ complete(&backtrace_work);
+}
+
+static DECLARE_TASKLET(backtrace_tasklet, &backtrace_test_irq_callback, 0);
+
+static void backtrace_test_irq(void)
{
printk("Testing a backtrace from irq context.\n");
printk("The following trace is a kernel self test and not a bug!\n");
- dump_stack();
+
+ init_completion(&backtrace_work);
+ tasklet_schedule(&backtrace_tasklet);
+ wait_for_completion(&backtrace_work);
+}
+
+#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");
- printk("Testing a backtrace from process context.\n");
- printk("The following trace is a kernel self test and not a bug!\n");
- dump_stack();
- init_timer(&backtrace_timer);
- backtrace_timer.function = backtrace_test_timer;
- mod_timer(&backtrace_timer, jiffies + 10);
+ backtrace_test_normal();
+ backtrace_test_irq();
+ backtrace_test_saved();
- msleep(10);
printk("====[ end of backtrace testing ]====\n");
return 0;
}
diff --git a/kernel/stacktrace.c b/kernel/stacktrace.c
index b71816e..94b527e 100644
--- a/kernel/stacktrace.c
+++ b/kernel/stacktrace.c
@@ -6,19 +6,21 @@
* Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
*/
#include <linux/sched.h>
+#include <linux/module.h>
#include <linux/kallsyms.h>
#include <linux/stacktrace.h>
void print_stack_trace(struct stack_trace *trace, int spaces)
{
- int i, j;
+ int i;
- for (i = 0; i < trace->nr_entries; i++) {
- unsigned long ip = trace->entries[i];
+ if (WARN_ON(!trace->entries))
+ return;
- for (j = 0; j < spaces + 1; j++)
- printk(" ");
- print_ip_sym(ip);
+ for (i = 0; i < trace->nr_entries; i++) {
+ printk("%*c", 1 + spaces, ' ');
+ print_ip_sym(trace->entries[i]);
}
}
+EXPORT_SYMBOL_GPL(print_stack_trace);
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index d8b6279..c459e85 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -419,7 +419,6 @@ config DEBUG_LOCKING_API_SELFTESTS
config STACKTRACE
bool
- depends on DEBUG_KERNEL
depends on STACKTRACE_SUPPORT
config DEBUG_KOBJECT
@@ -563,6 +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
generated by cgit v1.1 at 2024-12-28 09:55:09 +0000