diff options
| author | Zwane Mwaikambo <zwane@arm.linux.org.uk> | 2005-01-11 01:51:57 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-01-11 01:51:57 -0800 |
| commit | ffc8a499efb64e72fe76d5454ec6abc5c22f8556 (patch) | |
| tree | 38746440eb41fa0ed1130fecbcd6dbf1e8954fa2 /arch | |
| parent | bbb4828f1400f563571da6e7f65d8b828249dea5 (diff) | |
| download | history-ffc8a499efb64e72fe76d5454ec6abc5c22f8556.tar.gz | |
[PATCH] x86_64: Notify user of MCE events.
x86_64 uses a userspace mce utility to decode MCEs, this patch will ensure
that the user is notified of MCE events being logged too.
Signed-off-by: Zwane Mwaikambo <zwane@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86_64/kernel/mce.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/mce.c b/arch/x86_64/kernel/mce.c index 6e717e4704602b..b05d3b19278d5e 100644 --- a/arch/x86_64/kernel/mce.c +++ b/arch/x86_64/kernel/mce.c @@ -31,6 +31,8 @@ static int mce_dont_init; static int tolerant = 1; static int banks; static unsigned long bank[NR_BANKS] = { [0 ... NR_BANKS-1] = ~0UL }; +static unsigned long console_logged; +static int notify_user; /* * Lockless MCE logging infrastructure. @@ -68,6 +70,9 @@ void mce_log(struct mce *mce) smp_wmb(); mcelog.entry[entry].finished = 1; smp_wmb(); + + if (!test_and_set_bit(0, &console_logged)) + notify_user = 1; } static void print_mce(struct mce *m) @@ -252,6 +257,19 @@ static void mcheck_timer(void *data) { on_each_cpu(mcheck_check_cpu, NULL, 1, 1); schedule_delayed_work(&mcheck_work, check_interval * HZ); + + /* + * It's ok to read stale data here for notify_user and + * console_logged as we'll simply get the updated versions + * on the next mcheck_timer execution and atomic operations + * on console_logged act as synchronization for notify_user + * writes. + */ + if (notify_user && console_logged) { + notify_user = 0; + clear_bit(0, &console_logged); + printk(KERN_INFO "Machine check events logged\n"); + } } |