From eef4dfa0cb83899c782935ac5345532f47073cea Mon Sep 17 00:00:00 2001 From: Borislav Petkov Date: Wed, 12 Aug 2015 18:29:38 +0200 Subject: x86/mce: Kill drain_mcelog_buffer() This used to flush out MCEs logged during early boot and which were in the MCA registers from a previous system run. No need for that now, since we've moved to a genpool. Suggested-by: Tony Luck Signed-off-by: Borislav Petkov Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/1439396985-12812-7-git-send-email-bp@alien8.de Signed-off-by: Ingo Molnar --- arch/x86/kernel/cpu/mcheck/mce.c | 44 ++-------------------------------------- 1 file changed, 2 insertions(+), 42 deletions(-) (limited to 'arch/x86/kernel/cpu') diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c index 9568bb55bfe2..32b586ee006a 100644 --- a/arch/x86/kernel/cpu/mcheck/mce.c +++ b/arch/x86/kernel/cpu/mcheck/mce.c @@ -199,55 +199,15 @@ void mce_log(struct mce *mce) set_bit(0, &mce_need_notify); } -static void drain_mcelog_buffer(void) -{ - unsigned int next, i, prev = 0; - - next = ACCESS_ONCE(mcelog.next); - - do { - struct mce *m; - - /* drain what was logged during boot */ - for (i = prev; i < next; i++) { - unsigned long start = jiffies; - unsigned retries = 1; - - m = &mcelog.entry[i]; - - while (!m->finished) { - if (time_after_eq(jiffies, start + 2*retries)) - retries++; - - cpu_relax(); - - if (!m->finished && retries >= 4) { - pr_err("skipping error being logged currently!\n"); - break; - } - } - smp_rmb(); - atomic_notifier_call_chain(&x86_mce_decoder_chain, 0, m); - } - - memset(mcelog.entry + prev, 0, (next - prev) * sizeof(*m)); - prev = next; - next = cmpxchg(&mcelog.next, prev, 0); - } while (next != prev); -} - static struct notifier_block mce_srao_nb; -void mce_register_decode_chain(struct notifier_block *nb, bool drain) +void mce_register_decode_chain(struct notifier_block *nb) { /* Ensure SRAO notifier has the highest priority in the decode chain. */ if (nb != &mce_srao_nb && nb->priority == INT_MAX) nb->priority -= 1; atomic_notifier_chain_register(&x86_mce_decoder_chain, nb); - - if (drain) - drain_mcelog_buffer(); } EXPORT_SYMBOL_GPL(mce_register_decode_chain); @@ -2028,7 +1988,7 @@ __setup("mce", mcheck_enable); int __init mcheck_init(void) { mcheck_intel_therm_init(); - mce_register_decode_chain(&mce_srao_nb, false); + mce_register_decode_chain(&mce_srao_nb); mcheck_vendor_init_severity(); INIT_WORK(&mce_work, mce_process_work); -- cgit v1.2.1