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SubjectRe: [PATCH] panic: Call console_verbose in panic
On Tue, 11 May 2010 08:59:59 +1000
Anton Blanchard <anton@samba.org> wrote:

>
> Most distros turn the console verbosity down and that means a backtrace after
> a panic never makes it to the console. I assume we haven't seen this because
> a panic is often preceeded by an oops which will have called console_verbose.
> There are however a lot of places we call panic directly, and they are
> broken.
>
> Use console_verbose like we do in the oops path to ensure a directly called
> panic will print a backtrace.
>
> Signed-off-by: Anton Blanchard <anton@samba.org>
> ---
>
> Index: linux-2.6/kernel/panic.c
> ===================================================================
> --- linux-2.6.orig/kernel/panic.c 2010-05-09 09:13:06.000000000 +1000
> +++ linux-2.6/kernel/panic.c 2010-05-09 09:14:13.000000000 +1000
> @@ -87,6 +87,7 @@ NORET_TYPE void panic(const char * fmt,
> */
> preempt_disable();
>
> + console_verbose();
> bust_spinlocks(1);
> va_start(args, fmt);
> vsnprintf(buf, sizeof(buf), fmt, args);

hm, console_verbose() is interesting:

: static inline void console_verbose(void)
: {
: if (console_loglevel)
: console_loglevel = 15;
: }

so if someone has run console_silent():

: static inline void console_silent(void)
: {
: console_loglevel = 0;
: }

then console_verbose() doesn't work.


The sole caller of console_silent() is
arch/mn10300/kernel/mn10300-watchdog.c:watchdog_interrupt(), which
makes me wonder if mn10300 is doing something wrong or outdated?



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