Better safe than sorry: Clear all per-CPU perfctr_msr values so that
no one can rearm the NMI watchdog after we released it.
Signed-off-by: Jan Kiszka <jan.kis...@web.de>
---
ksrc/arch/x86/nmi_32.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/ksrc/arch/x86/nmi_32.c b/ksrc/arch/x86/nmi_32.c
index 78ba905..69a392a 100644
--- a/ksrc/arch/x86/nmi_32.c
+++ b/ksrc/arch/x86/nmi_32.c
@@ -264,6 +264,7 @@ int rthal_nmi_request(void (*emergency) (struct pt_regs *))
void rthal_nmi_release(void)
{
rthal_nmi_wd_t *wd = &rthal_nmi_wds[rthal_processor_id()];
+ int i;
if (!rthal_linux_nmi_tick)
return;
@@ -276,6 +277,8 @@ void rthal_nmi_release(void)
wrmsr(wd->perfctr_msr, (u32)(0 - RTHAL_CPU_FREQ), 0);
else
wrmsrl(wd->perfctr_msr, 0 - RTHAL_CPU_FREQ);
+ for (i = 0; i < NR_CPUS; i++)
+ rthal_nmi_wds[i].perfctr_msr = 0;
touch_nmi_watchdog();
wmb();
nmi_watchdog_tick = rthal_linux_nmi_tick;
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