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

1 files changed, 2 insertions, 18 deletions

diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
index c3498732ba28..58925e7ccb27 100644
--- a/arch/x86/kernel/cpu/mce/core.c
+++ b/arch/x86/kernel/cpu/mce/core.c
@@ -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();