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x86: Convert some devices to use DIE_NMIUNKNOWN 

They are a handful of places in the code that register a die_notifier
as a catch all in case no claims the NMI.  Unfortunately, they trigger
on events like DIE_NMI and DIE_NMI_IPI, which depending on when they
registered may collide with other handlers that have the ability to
determine if the NMI is theirs or not.

The function unknown_nmi_error() makes one last effort to walk the
die_chain when no one else has claimed the NMI before spitting out
messages that the NMI is unknown.

This is a better spot for these devices to execute any code without
colliding with the other handlers.

The two drivers modified are only compiled on x86 arches I believe, so
they shouldn't be affected by other arches that may not have
DIE_NMIUNKNOWN defined.

Signed-off-by: Don Zickus <dzickus@redhat.com>
Cc: Russ Anderson <rja@sgi.com>
Cc: Corey Minyard <minyard@acm.org>
Cc: openipmi-developer@lists.sourceforge.net
Cc: dann frazier <dannf@hp.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1294348732-15030-3-git-send-email-dzickus@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Don Zickus 2011-01-06 16:18:48 -05:00 committed by Ingo Molnar
parent 1c7b74d46f
commit 673a6092ce
3 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/kernel/apic/x2apic_uv_x.c
View File

@ -639,7 +639,7 @@ void __cpuinit uv_cpu_init(void)
*/
int uv_handle_nmi(struct notifier_block *self, unsigned long reason, void *data)
{
if (reason != DIE_NMI_IPI)
if (reason != DIE_NMIUNKNOWN)
return NOTIFY_OK;
if (in_crash_kexec)

2
drivers/char/ipmi/ipmi_watchdog.c
View File

@ -1081,7 +1081,7 @@ ipmi_nmi(struct notifier_block *self, unsigned long val, void *data)
{
struct die_args *args = data;
if (val != DIE_NMI)
if (val != DIE_NMIUNKNOWN)
return NOTIFY_OK;
/* Hack, if it's a memory or I/O error, ignore it. */

2
drivers/watchdog/hpwdt.c
View File

@ -469,7 +469,7 @@ static int hpwdt_pretimeout(struct notifier_block *nb, unsigned long ulReason,
unsigned long rom_pl;
static int die_nmi_called;
if (ulReason != DIE_NMI && ulReason != DIE_NMI_IPI)
if (ulReason != DIE_NMIUNKNOWN)
goto out;
if (!hpwdt_nmi_decoding)