From 3adbbcce9a49b900d4cc118cdccfdefa78bf1afb Mon Sep 17 00:00:00 2001 From: Don Zickus Date: Tue, 26 Sep 2006 10:52:26 +0200 Subject: [PATCH] x86: Cleanup NMI interrupt path This patch cleans up the NMI interrupt path. Instead of being gated by if the 'nmi callback' is set, the interrupt handler now calls everyone who is registered on the die_chain and additionally checks the nmi watchdog, reseting it if enabled. This allows more subsystems to hook into the NMI if they need to (without being block by set_nmi_callback). Signed-off-by: Don Zickus Signed-off-by: Andi Kleen --- arch/i386/kernel/nmi.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) (limited to 'arch/i386/kernel/nmi.c') diff --git a/arch/i386/kernel/nmi.c b/arch/i386/kernel/nmi.c index d880043..bd96ea4 100644 --- a/arch/i386/kernel/nmi.c +++ b/arch/i386/kernel/nmi.c @@ -781,7 +781,7 @@ EXPORT_SYMBOL(touch_nmi_watchdog); extern void die_nmi(struct pt_regs *, const char *msg); -void nmi_watchdog_tick (struct pt_regs * regs, unsigned reason) +int nmi_watchdog_tick (struct pt_regs * regs, unsigned reason) { /* @@ -794,10 +794,12 @@ void nmi_watchdog_tick (struct pt_regs * regs, unsigned reason) int cpu = smp_processor_id(); struct nmi_watchdog_ctlblk *wd = &__get_cpu_var(nmi_watchdog_ctlblk); u64 dummy; + int rc=0; /* check for other users first */ if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP) { + rc = 1; touched = 1; } @@ -850,10 +852,18 @@ void nmi_watchdog_tick (struct pt_regs * regs, unsigned reason) } /* start the cycle over again */ write_watchdog_counter(wd->perfctr_msr, NULL); - } + rc = 1; + } else if (nmi_watchdog == NMI_IO_APIC) { + /* don't know how to accurately check for this. + * just assume it was a watchdog timer interrupt + * This matches the old behaviour. + */ + rc = 1; + } else + printk(KERN_WARNING "Unknown enabled NMI hardware?!\n"); } done: - return; + return rc; } #ifdef CONFIG_SYSCTL -- cgit v1.1