https://github.com/torvalds/linux
Revision 23d5ea5d3edcfe899cd91fca87a4af799bcc5794 authored by Stephane Eranian on 06 September 2007, 14:59:51 UTC, committed by Linus Torvalds on 11 September 2007, 01:57:47 UTC
Fix the NMI watchdog on Intel CoreDuo processor where the kernel would
get stuck during boot.  The issue is related to errata AE49, where the
PERFEVTSEL1 counter does not have a working enable bit.  Thus it is not
possible to use it for NMI.

The patch creates a dedicated wd_ops for CoreDuo which falls back to
using PERFEVTSEL0.  The other Intel processors supporting the
architectural PMU will keep on using PERFEVTSEL1 as this allows other
subsystems, such as perfmon, to use PERFEVTSEL0 for PEBS monitoring in
particular.  Bug initially reported by Daniel Walker.

AK: Added comments

Signed-off-by: Stephane Eranian <eranian@hpl.hp.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent b8da0d1
History
Tip revision: 23d5ea5d3edcfe899cd91fca87a4af799bcc5794 authored by Stephane Eranian on 06 September 2007, 14:59:51 UTC
i386: Fix perfctr watchdog on core duo
Tip revision: 23d5ea5
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arch
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crypto
drivers
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include
init
ipc
kernel
lib
mm
net
scripts
security
sound
usr
.gitignore -rw-r--r-- 607 bytes
.mailmap -rw-r--r-- 3.6 KB
COPYING -rw-r--r-- 18.3 KB
CREDITS -rw-r--r-- 89.3 KB
Kbuild -rw-r--r-- 1.5 KB
MAINTAINERS -rw-r--r-- 91.2 KB
Makefile -rw-r--r-- 50.1 KB
README -rw-r--r-- 16.5 KB
REPORTING-BUGS -rw-r--r-- 3.0 KB

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