From 45486f81c9aa07218b73a38cbcf62ffa66e99088 Mon Sep 17 00:00:00 2001 From: Keith Owens Date: Mon, 26 Jun 2006 13:59:41 +0200 Subject: [PATCH] x86_64: Standardize i386/x86_64 handling of NMI_VECTOR x86_64 and i386 behave inconsistently when sending an IPI on vector 2 (NMI_VECTOR). Make both behave the same, so IPI 2 is sent as NMI. The crash code was abusing send_IPI_allbutself() by passing a code instead of a vector, it only worked because crash knew about the internal code of send_IPI_allbutself(). Change crash to use NMI_VECTOR instead, and remove the comment about how crash was abusing the function. This patch is a pre-requisite for fixing the problem where sending an IPI as NMI would reboot some Dell Xeon systems. I cannot fix that problem while crash continus to abuse send_IPI_allbutself(). It also removes the inconsistency between i386 and x86_64 for NMI_VECTOR. That will simplify all the RAS code that needs to bring all the cpus to a clean stop, even when one or more cpus are spinning disabled. Signed-off-by: Keith Owens Signed-off-by: Andi Kleen Signed-off-by: Linus Torvalds --- arch/i386/kernel/crash.c | 7 +------ arch/i386/kernel/smp.c | 12 +++++++++++- 2 files changed, 12 insertions(+), 7 deletions(-) (limited to 'arch/i386') diff --git a/arch/i386/kernel/crash.c b/arch/i386/kernel/crash.c index 21dc1bbb806..0c88d3ec8c1 100644 --- a/arch/i386/kernel/crash.c +++ b/arch/i386/kernel/crash.c @@ -120,14 +120,9 @@ static int crash_nmi_callback(struct pt_regs *regs, int cpu) return 1; } -/* - * By using the NMI code instead of a vector we just sneak thru the - * word generator coming out with just what we want. AND it does - * not matter if clustered_apic_mode is set or not. - */ static void smp_send_nmi_allbutself(void) { - send_IPI_allbutself(APIC_DM_NMI); + send_IPI_allbutself(NMI_VECTOR); } static void nmi_shootdown_cpus(void) diff --git a/arch/i386/kernel/smp.c b/arch/i386/kernel/smp.c index d134e9643a5..c10789d7a9d 100644 --- a/arch/i386/kernel/smp.c +++ b/arch/i386/kernel/smp.c @@ -114,7 +114,17 @@ DEFINE_PER_CPU(struct tlb_state, cpu_tlbstate) ____cacheline_aligned = { &init_m static inline int __prepare_ICR (unsigned int shortcut, int vector) { - return APIC_DM_FIXED | shortcut | vector | APIC_DEST_LOGICAL; + unsigned int icr = shortcut | APIC_DEST_LOGICAL; + + switch (vector) { + default: + icr |= APIC_DM_FIXED | vector; + break; + case NMI_VECTOR: + icr |= APIC_DM_NMI; + break; + } + return icr; } static inline int __prepare_ICR2 (unsigned int mask) -- cgit v1.2.3