From e273e6e12ab1db3eb57712bd60655744d0091fa3 Mon Sep 17 00:00:00 2001 From: Gabriele Paoloni Date: Fri, 27 Nov 2020 16:18:16 +0000 Subject: [PATCH] x86/mce: Move the mce_panic() call and 'kill_it' assignments to the right places Right now, for local MCEs the machine calls panic(), if needed, right after lmce is set. For MCE broadcasting, mce_reign() takes care of calling mce_panic(). Hence: - improve readability by moving the conditional evaluation of tolerant up to when kill_it is set first; - move the mce_panic() call up into the statement where mce_end() fails. [ bp: Massage, remove comment in the mce_end() failure case because it is superfluous; use local ptr 'cfg' in both tests. ] Signed-off-by: Gabriele Paoloni Signed-off-by: Borislav Petkov Reviewed-by: Tony Luck Link: https://lkml.kernel.org/r/20201127161819.3106432-3-gabriele.paoloni@intel.com --- arch/x86/kernel/cpu/mce/core.c | 15 ++++----------- 1 file changed, 4 insertions(+), 11 deletions(-) diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c index f319bed1c59d2..ebaa52a0c0247 100644 --- a/arch/x86/kernel/cpu/mce/core.c +++ b/arch/x86/kernel/cpu/mce/core.c @@ -1351,8 +1351,7 @@ noinstr void do_machine_check(struct pt_regs *regs) * severity is MCE_AR_SEVERITY we have other options. */ if (!(m.mcgstatus & MCG_STATUS_RIPV)) - kill_it = 1; - + kill_it = (cfg->tolerant == 3) ? 0 : 1; /* * Check if this MCE is signaled to only this logical processor, * on Intel, Zhaoxin only. @@ -1388,6 +1387,9 @@ noinstr void do_machine_check(struct pt_regs *regs) if (mce_end(order) < 0) { if (!no_way_out) no_way_out = worst >= MCE_PANIC_SEVERITY; + + if (no_way_out && cfg->tolerant < 3) + mce_panic("Fatal machine check on current CPU", &m, msg); } } else { /* @@ -1404,15 +1406,6 @@ noinstr void do_machine_check(struct pt_regs *regs) } } - /* - * If tolerant is at an insane level we drop requests to kill - * processes and continue even when there is no way out. - */ - if (cfg->tolerant == 3) - kill_it = 0; - else if (no_way_out) - mce_panic("Fatal machine check on current CPU", &m, msg); - if (worst > 0) irq_work_queue(&mce_irq_work); -- 2.30.2