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SubjectRe: [RFC][PATCH] locking/refcount: Provide __refcount API to obtain the old value
On Wed, Jul 29, 2020 at 01:11:20PM +0200, peterz@infradead.org wrote:
> Subject: locking/refcount: Provide __refcount API to obtain the old value
> From: Peter Zijlstra <peterz@infradead.org>
> Date: Wed Jul 29 13:00:57 CEST 2020
>
> David requested means to obtain the old/previous value from the
> refcount API for tracing purposes.
>
> Duplicate (most of) the API as __refcount*() with an additional
> 'int *' argument into which, if !NULL, the old value will be stored.
>
> Requested-by: David Howells <dhowells@redhat.com>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>

This looks good to me. Thanks for poking at it!

Reviewed-by: Kees Cook <keescook@chromium.org>

--
Kees Cook

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