Messages in this thread Patch in this message | | | Date | Mon, 15 Nov 2021 09:56:30 +0100 | Subject | [PATCH] panic: use error_report_end tracepoint on warnings | From | Marco Elver <> |
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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.
Signed-off-by: Marco Elver <elver@google.com> --- include/trace/events/error_report.h | 8 +++++--- kernel/panic.c | 2 ++ 2 files changed, 7 insertions(+), 3 deletions(-)
diff --git a/include/trace/events/error_report.h b/include/trace/events/error_report.h index 96f64bf218b2..ed0164f8e79c 100644 --- a/include/trace/events/error_report.h +++ b/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 diff --git a/kernel/panic.c b/kernel/panic.c index cefd7d82366f..8e299cae1615 100644 --- a/kernel/panic.c +++ b/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, void *caller, unsigned taint, 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); -- 2.34.0.rc1.387.gb447b232ab-goog
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