linux-kernel - Re: [patch 4/4] ipc: sem optimise simple operations

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Message-ID: <20090811200711.GA24213@lenovo>
Date:	Wed, 12 Aug 2009 00:07:11 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	npiggin@...e.de
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Manfred Spraul <manfred@...orfullife.com>,
	Nadia Derbey <Nadia.Derbey@...l.net>,
	Pierre Peiffer <peifferp@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 4/4] ipc: sem optimise simple operations

[npiggin@...e.de - Tue, Aug 11, 2009 at 09:09:06PM +1000]
...
| +static void update_queue_simple(struct sem_array *sma, ushort semnum)
| +{
| +	if (unlikely(sma->complex_count)) {
| +		update_queue(sma);
| +	} else {
| +		struct sem *sem;
| +
| +		sem = &sma->sem_base[semnum];
| +		if (sem->semval > 0)
| +			update_negv_queue(sma, sem);
| +		if (sem->semval == 0)
| +			update_zero_queue(sma, sem);
| +	}
| +}
| +
...

Hi Nick,

mostly probably miss something but can't we trgigger BUG_ON at updating
zero queue if semaphore was created with undo list and via new operation
reached -ERANGE on undo value?

Again, I could be missing something or plain wrong. Just a thought.

	-- Cyrill
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