Messages in this thread | | | Date | Fri, 28 Nov 2008 18:00:29 +0100 | From | Ingo Molnar <> | Subject | Re: [PATCH 2/2] warn: print the DMI board info name in a WARN/WARN_ON |
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* Arjan van de Ven <arjan@linux.intel.com> wrote:
> From acdc8771dfaf6e8236b9122364301f65f46d4b59 Mon Sep 17 00:00:00 2001 > From: Arjan van de Ven <arjan@linux.intel.com> > Date: Fri, 28 Nov 2008 08:32:44 -0800 > Subject: [PATCH] warn: print the DMI board info name in a WARN/WARN_ON > > it's very useful for many low level WARN_ON's to find out which > motherboard has the broken BIOS etc... this patch adds a printk > to the WARN_ON code for this. > On architectures without DMI, gcc should optimize the code out. > > Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> > --- > kernel/panic.c | 5 +++++ > 1 files changed, 5 insertions(+), 0 deletions(-) > > diff --git a/kernel/panic.c b/kernel/panic.c > index 2b913aa..9c1b7e0 100644 > --- a/kernel/panic.c > +++ b/kernel/panic.c > @@ -21,6 +21,7 @@ > #include <linux/debug_locks.h> > #include <linux/random.h> > #include <linux/kallsyms.h> > +#include <linux/dmi.h> > > int panic_on_oops; > static unsigned long tainted_mask; > @@ -328,12 +329,16 @@ void warn_slowpath(const char *file, int line, const char *fmt, ...) > { > va_list args; > char function[KSYM_SYMBOL_LEN]; > + const char *board; > unsigned long caller = (unsigned long)__builtin_return_address(0); > sprint_symbol(function, caller); > > printk(KERN_WARNING "------------[ cut here ]------------\n"); > printk(KERN_WARNING "WARNING: at %s:%d %s()\n", file, > line, function); > + board = dmi_get_system_info(DMI_PRODUCT_NAME); > + if (board) > + printk(KERN_WARNING "Hardware name: %s\n", board); > > if (fmt) { > va_start(args, fmt);
nice idea - applied to tip/core/debug.
On architectures (or systems) where there's no DMI_PRODUCT_NAME string available, we'll print nothing. It's also a simple lockless call so can be called from any context.
Andrew, any objections?
Ingo
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