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x86/mce: Remove mce_report_event() 

Calling this function has been wrong for a while now:

* Can't call schedule_work() in #MC context.

* mce_notify_irq() either.

* None of that noodling is needed anymore - all it needs to do is kick
the IRQ work which would self-IPI so that once the #MC handler is done,
the work queue will run and process queued MCE records.

So remove it.

Reported-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: x86@kernel.org
Link: https://lkml.kernel.org/r/20190325172121.7926-1-bp@alien8.de
This commit is contained in:
Borislav Petkov 2019-03-12 19:39:23 +01:00
parent 006c077041
commit 39f0584ee6
1 changed files with 2 additions and 18 deletions
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20
arch/x86/kernel/cpu/mce/core.c
View File

@ -460,23 +460,6 @@ static void mce_irq_work_cb(struct irq_work *entry)
mce_schedule_work();
}
static void mce_report_event(struct pt_regs *regs)
{
if (regs->flags & (X86_VM_MASK|X86_EFLAGS_IF)) {
mce_notify_irq();
/*
* Triggering the work queue here is just an insurance
* policy in case the syscall exit notify handler
* doesn't run soon enough or ends up running on the
* wrong CPU (can happen when audit sleeps)
*/
mce_schedule_work();
return;
}
irq_work_queue(&mce_irq_work);
}
/*
* Check if the address reported by the CPU is in a format we can parse.
* It would be possible to add code for most other cases, but all would
@ -1331,7 +1314,8 @@ void do_machine_check(struct pt_regs *regs, long error_code)
mce_panic("Fatal machine check on current CPU", &m, msg);
if (worst > 0)
mce_report_event(regs);
irq_work_queue(&mce_irq_work);
mce_wrmsrl(MSR_IA32_MCG_STATUS, 0);
sync_core();