linux-kernel - Re: [PATCH 6/6] ipc/sem.c: make semctl(,,{GETNCNT,GETZCNT}) standard compliant

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Message-Id: <20140519154639.5570a30f8b47872a323dcdfd@linux-foundation.org>
Date:	Mon, 19 May 2014 15:46:39 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Manfred Spraul <manfred@...orfullife.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Davidlohr Bueso <davidlohr.bueso@...com>,
	Michael Kerrisk <mtk.manpages@...il.com>, 1vier1@....de
Subject: Re: [PATCH 6/6] ipc/sem.c: make semctl(,,{GETNCNT,GETZCNT})
 standard compliant

On Sun, 18 May 2014 09:58:37 +0200 Manfred Spraul <manfred@...orfullife.com> wrote:

> SUSv4 clearly defines how semncnt and semzcnt must be calculated:
> A task waits on exactly one semaphore:
> The semaphore from the first operation in the sop array that cannot proceed.
> 
> The Linux implementation never followed the standard, it tried to count all
> semaphores that might be the reason why a task sleeps.
> 
> This patch fixes that.

What are the back-compatibility implications of this change?
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