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Date: Wed, 15 Aug 2007 12:38:58 +0200 (CEST) From: Andi Kleen <ak@...e.de> To: avi@...ranet.com, patches@...-64.org, linux-kernel@...r.kernel.org, stable@...nel.org Subject: [PATCH 2.6.22] [5/5] i386: Handle P6s without performance counters in nmi watchdog I got an oops while booting a 32bit kernel on KVM because it doesn't implement performance counters used by the NMI watchdog. Handle this case. Cc: avi@...ranet.com Signed-off-by: Andi Kleen <ak@...e.de> --- arch/i386/kernel/cpu/perfctr-watchdog.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) Index: linux-2.6.22-stable/arch/i386/kernel/cpu/perfctr-watchdog.c =================================================================== --- linux-2.6.22-stable.orig/arch/i386/kernel/cpu/perfctr-watchdog.c +++ linux-2.6.22-stable/arch/i386/kernel/cpu/perfctr-watchdog.c @@ -346,7 +346,9 @@ static int setup_p6_watchdog(unsigned nm perfctr_msr = MSR_P6_PERFCTR0; evntsel_msr = MSR_P6_EVNTSEL0; - wrmsrl(perfctr_msr, 0UL); + /* KVM doesn't implement this MSR */ + if (wrmsr_safe(perfctr_msr, 0, 0) < 0) + return 0; evntsel = P6_EVNTSEL_INT | P6_EVNTSEL_OS - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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