diff mbox series

[148/156] panic: dump registers on panic_on_warn

Message ID 20201016025018.o2XSfGQXU%akpm@linux-foundation.org (mailing list archive)
State New
Headers show
Series [001/156] device-dax/kmem: fix resource release | expand

Commit Message

Andrew Morton Oct. 16, 2020, 2:50 a.m. UTC
From: Alexey Kardashevskiy <aik@ozlabs.ru>
Subject: panic: dump registers on panic_on_warn

Currently we print stack and registers for ordinary warnings but we do not
for panic_on_warn which looks as oversight - panic() will reboot the
machine but won't print registers.

This moves printing of registers and modules earlier.

This does not move the stack dumping as panic() dumps it.

Link: https://lkml.kernel.org/r/20200804095054.68724-1-aik@ozlabs.ru
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: Douglas Anderson <dianders@chromium.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Rafael Aquini <aquini@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

 kernel/panic.c |   12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)
diff mbox series


--- a/kernel/panic.c~panic-dump-registers-on-panic_on_warn
+++ a/kernel/panic.c
@@ -589,6 +589,11 @@  void __warn(const char *file, int line,
 	if (args)
 		vprintk(args->fmt, args->args);
+	print_modules();
+	if (regs)
+		show_regs(regs);
 	if (panic_on_warn) {
 		 * This thread may hit another WARN() in the panic path.
@@ -600,12 +605,7 @@  void __warn(const char *file, int line,
 		panic("panic_on_warn set ...\n");
-	print_modules();
-	if (regs)
-		show_regs(regs);
-	else
-		dump_stack();
+	dump_stack();