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(parent: 4e193bd) | patch
perf_counter: fix crash on perfmon v1 systems
authorIngo Molnar <mingo@elte.hu>
Wed, 18 Mar 2009 07:59:21 +0000 (08:59 +0100)
committerIngo Molnar <mingo@elte.hu>
Mon, 6 Apr 2009 07:30:14 +0000 (09:30 +0200)
commit7bb497bd885eedd0f56dfe3cc1b5ff20710d33b9
tree4f743d26a10f0a978ad2cfd0ef23c936c5ea0034tree | snapshot (tar.gz zip)
parent4e193bd4dfdc983d12969b51439b4a1fbaf2daadcommit | diff
perf_counter: fix crash on perfmon v1 systems

Impact: fix boot crash on Intel Perfmon Version 1 systems

Intel Perfmon v1 does not support the global MSRs, nor does
it offer the generalized MSR ranges. So support v2 and later
CPUs only.

Also mark pmc_ops as read-mostly - to avoid false cacheline
sharing.

Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
arch/x86/kernel/cpu/perf_counter.c diff | blob | blame | history