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| author | Andi Kleen <ak@suse.de> | 2006-04-07 19:49:57 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-04-09 11:53:52 -0700 |
| commit | 553f265fe883a23502ee351845f09334790f18b8 (patch) | |
| tree | 1fd60e72d7d5cbed34812eb6763899d2bd37c152 /arch/x86_64/kernel | |
| parent | be56db6186999a8571ae480cf2b929578f6dfd68 (diff) | |
| download | linux-stable-553f265fe883a23502ee351845f09334790f18b8.tar.gz linux-stable-553f265fe883a23502ee351845f09334790f18b8.tar.bz2 linux-stable-553f265fe883a23502ee351845f09334790f18b8.zip | |
[PATCH] x86_64: Don't run NMI watchdog during machine checks
Machine checks can stall the machine for a long time and
it's not good to trigger the nmi watchdog during that.
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/x86_64/kernel')
| -rw-r--r-- | arch/x86_64/kernel/mce.c | 8 | ||||
| -rw-r--r-- | arch/x86_64/kernel/nmi.c | 7 |
2 files changed, 14 insertions, 1 deletions
diff --git a/arch/x86_64/kernel/mce.c b/arch/x86_64/kernel/mce.c index 10b3e348fc99..6f0790e8b6d3 100644 --- a/arch/x86_64/kernel/mce.c +++ b/arch/x86_64/kernel/mce.c @@ -29,6 +29,8 @@ #define MISC_MCELOG_MINOR 227 #define NR_BANKS 6 +atomic_t mce_entry; + static int mce_dont_init; /* 0: always panic, 1: panic if deadlock possible, 2: try to avoid panic, @@ -172,10 +174,12 @@ void do_machine_check(struct pt_regs * regs, long error_code) int i; int panicm_found = 0; + atomic_inc(&mce_entry); + if (regs) notify_die(DIE_NMI, "machine check", regs, error_code, 18, SIGKILL); if (!banks) - return; + goto out2; memset(&m, 0, sizeof(struct mce)); m.cpu = safe_smp_processor_id(); @@ -266,6 +270,8 @@ void do_machine_check(struct pt_regs * regs, long error_code) out: /* Last thing done in the machine check exception to clear state. */ wrmsrl(MSR_IA32_MCG_STATUS, 0); + out2: + atomic_dec(&mce_entry); } /* diff --git a/arch/x86_64/kernel/nmi.c b/arch/x86_64/kernel/nmi.c index d9e4067faf05..4e6357fe0ec3 100644 --- a/arch/x86_64/kernel/nmi.c +++ b/arch/x86_64/kernel/nmi.c @@ -34,6 +34,7 @@ #include <asm/proto.h> #include <asm/kdebug.h> #include <asm/local.h> +#include <asm/mce.h> /* * lapic_nmi_owner tracks the ownership of the lapic NMI hardware: @@ -480,6 +481,12 @@ void __kprobes nmi_watchdog_tick(struct pt_regs * regs, unsigned reason) __get_cpu_var(nmi_touch) = 0; touched = 1; } +#ifdef CONFIG_X86_MCE + /* Could check oops_in_progress here too, but it's safer + not too */ + if (atomic_read(&mce_entry) > 0) + touched = 1; +#endif if (!touched && __get_cpu_var(last_irq_sum) == sum) { /* * Ayiee, looks like this CPU is stuck ... |