Re: [PATCH 4/6] x86-mce: Add spinlocks to prevent duplicated MCP and CMCI reports.

From: Andi Kleen
Date: Wed Jul 09 2014 - 16:35:34 EST

Havard Skinnemoen <hskinnemoen@xxxxxxxxxx> writes:

> machine_check_poll() was modified to use spin_lock_irqsave independently
> per bank when a valid MCE is found to prevent duplicated MCE reports by
> the CMCI and polling methods. In the common case no MCE will be found,
> so the lock is not acquired until a valid MCE is found. The status is
> reread after the lock is acquired in case the MCE was already handled by
> a different thread. A unique spinlock is used per bank number, so
> contention should be mostly limited to non-shared banks.

This doesn't make sense. Banks are either owned by CMCI or by poll,
not by both. If you have true duplicates the bug must be somewhere else.


ak@xxxxxxxxxxxxxxx -- Speaking for myself only
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