Re: [PATCH] x86 spinlock: Fix memory corruption on completing completions

From: Peter Zijlstra
Date: Mon Feb 09 2015 - 07:02:57 EST

On Mon, Feb 09, 2015 at 03:04:22PM +0530, Raghavendra K T wrote:
> So we have 3 choices,
> 1. xadd
> 2. continue with current approach.
> 3. a read before unlock and also after that.

For the truly paranoid we have probe_kernel_address(), suppose the lock
was in module space and the module just got unloaded under us.

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