From 42ac8ff2ce58138ba1339296406bde6636792bd8 Mon Sep 17 00:00:00 2001 From: Jan Beulich Date: Tue, 13 Sep 2005 01:25:51 -0700 Subject: [PATCH] [PATCH] x86_64: NMI watchdog frequency calculation adjustments Like previously done for i386, get the x86_64 watchdog tick calculation into a state where it can also be used on CPUs with frequencies beyond 4GHz. Signed-off-by: Jan Beulich Acked-by: Andi Kleen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/x86_64/kernel/nmi.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/x86_64/kernel/nmi.c b/arch/x86_64/kernel/nmi.c index 4388b8a5bae..39d445e16f2 100644 --- a/arch/x86_64/kernel/nmi.c +++ b/arch/x86_64/kernel/nmi.c @@ -366,7 +366,7 @@ static void setup_k7_watchdog(void) | K7_NMI_EVENT; wrmsr(MSR_K7_EVNTSEL0, evntsel, 0); - wrmsr(MSR_K7_PERFCTR0, -(cpu_khz/nmi_hz*1000), -1); + wrmsrl(MSR_K7_PERFCTR0, -((u64)cpu_khz * 1000 / nmi_hz)); apic_write(APIC_LVTPC, APIC_DM_NMI); evntsel |= K7_EVNTSEL_ENABLE; wrmsr(MSR_K7_EVNTSEL0, evntsel, 0); @@ -407,8 +407,8 @@ static int setup_p4_watchdog(void) wrmsr(MSR_P4_CRU_ESCR0, P4_NMI_CRU_ESCR0, 0); wrmsr(MSR_P4_IQ_CCCR0, P4_NMI_IQ_CCCR0 & ~P4_CCCR_ENABLE, 0); - Dprintk("setting P4_IQ_COUNTER0 to 0x%08lx\n", -(cpu_khz/nmi_hz*1000)); - wrmsr(MSR_P4_IQ_COUNTER0, -(cpu_khz/nmi_hz*1000), -1); + Dprintk("setting P4_IQ_COUNTER0 to 0x%08lx\n", -(cpu_khz * 1000UL / nmi_hz)); + wrmsrl(MSR_P4_IQ_COUNTER0, -((u64)cpu_khz * 1000 / nmi_hz)); apic_write(APIC_LVTPC, APIC_DM_NMI); wrmsr(MSR_P4_IQ_CCCR0, nmi_p4_cccr_val, 0); return 1; @@ -506,7 +506,7 @@ void nmi_watchdog_tick (struct pt_regs * regs, unsigned reason) wrmsr(MSR_P4_IQ_CCCR0, nmi_p4_cccr_val, 0); apic_write(APIC_LVTPC, APIC_DM_NMI); } - wrmsr(nmi_perfctr_msr, -(cpu_khz/nmi_hz*1000), -1); + wrmsrl(nmi_perfctr_msr, -((u64)cpu_khz * 1000 / nmi_hz)); } } -- 2.41.0