The patch titled
Subject: panic: use error_report_end tracepoint on warnings
has been added to the -mm tree. Its filename is
panic-use-error_report_end-tracepoint-on-warnings.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/panic-use-error_report_end-tracepoint-on-warnings.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/panic-use-error_report_end-tracepoint-on-warnings.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Marco Elver <elver@xxxxxxxxxx>
Subject: panic: use error_report_end tracepoint on warnings
Introduce the error detector "warning" to the error_report event and use
the error_report_end tracepoint at the end of a warning report.
This allows in-kernel tests but also userspace to more easily determine
if a warning occurred without polling kernel logs.
Link: https://lkml.kernel.org/r/20211115085630.1756817-1-elver@xxxxxxxxxx
Signed-off-by: Marco Elver <elver@xxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Petr Mladek <pmladek@xxxxxxxx>
Cc: Luis Chamberlain <mcgrof@xxxxxxxxxx>
Cc: Wei Liu <wei.liu@xxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: John Ogness <john.ogness@xxxxxxxxxxxxx>
Cc: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Cc: Alexander Popov <alex.popov@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/trace/events/error_report.h | 8 +++++---
kernel/panic.c | 2 ++
2 files changed, 7 insertions(+), 3 deletions(-)
--- a/include/trace/events/error_report.h~panic-use-error_report_end-tracepoint-on-warnings
+++ a/include/trace/events/error_report.h
@@ -17,14 +17,16 @@
enum error_detector {
ERROR_DETECTOR_KFENCE,
- ERROR_DETECTOR_KASAN
+ ERROR_DETECTOR_KASAN,
+ ERROR_DETECTOR_WARN
};
#endif /* __ERROR_REPORT_DECLARE_TRACE_ENUMS_ONCE_ONLY */
-#define error_detector_list \
+#define error_detector_list \
EM(ERROR_DETECTOR_KFENCE, "kfence") \
- EMe(ERROR_DETECTOR_KASAN, "kasan")
+ EM(ERROR_DETECTOR_KASAN, "kasan") \
+ EMe(ERROR_DETECTOR_WARN, "warning")
/* Always end the list with an EMe. */
#undef EM
--- a/kernel/panic.c~panic-use-error_report_end-tracepoint-on-warnings
+++ a/kernel/panic.c
@@ -32,6 +32,7 @@
#include <linux/bug.h>
#include <linux/ratelimit.h>
#include <linux/debugfs.h>
+#include <trace/events/error_report.h>
#include <asm/sections.h>
#define PANIC_TIMER_STEP 100
@@ -609,6 +610,7 @@ void __warn(const char *file, int line,
print_irqtrace_events(current);
print_oops_end_marker();
+ trace_error_report_end(ERROR_DETECTOR_WARN, (unsigned long)caller);
/* Just a warning, don't kill lockdep. */
add_taint(taint, LOCKDEP_STILL_OK);
_
Patches currently in -mm which might be from elver@xxxxxxxxxx are
panic-use-error_report_end-tracepoint-on-warnings.patch
