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x86: Convert some devices to use DIE_NMIUNKNOWN

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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 <[email protected]>
Cc: Russ Anderson <[email protected]>
Cc: Corey Minyard <[email protected]>
Cc: [email protected]
Cc: dann frazier <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
LKML-Reference: <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Don Zickus 2011-01-06 16:18:48 -05:00 • committed by Ingo Molnar
commit 673a6092ce
3 changed files with 3 additions and 3 deletions
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2
drivers/watchdog/hpwdt.c
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@ -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)