linux-kernel - Re: [PATCH 2/2] ipc,sem: remove uneeded sem_undo_list lock usage in exit

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Message-ID: <55CA3F69.7040101@colorfullife.com>
Date:	Tue, 11 Aug 2015 20:31:05 +0200
From:	Manfred Spraul <manfred@...orfullife.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Herton R. Krzesinski" <herton@...hat.com>,
	linux-kernel@...r.kernel.org, Davidlohr Bueso <dave@...olabs.net>,
	Rafael Aquini <aquini@...hat.com>,
	Joe Perches <joe@...ches.com>,
	Aristeu Rozanski <aris@...hat.com>, djeffery@...hat.com
Subject: Re: [PATCH 2/2] ipc,sem: remove uneeded sem_undo_list lock usage in
 exit_sem()

On 08/11/2015 07:19 PM, Herton R. Krzesinski wrote:
> After we acquire the sma->sem_perm lock in exit_sem(), we are protected against
> a racing IPC_RMID operation. Also at that point, we are the last user of
> sem_undo_list. Therefore it isn't required that we acquire or use ulp->lock.
>
> Signed-off-by: Herton R. Krzesinski <herton@...hat.com>
Acked-by: Manfred Spraul <manfred@...orfullife.com>

-- 
     Manfred
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