linux-kernel - Re: [PATCH v2 2/6] oom: Get rid of sparse warnings

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Message-ID: <CAHGf_=rW-EJvj-hsKgEGw4F4uAKMv-U-iG6aROzw2rN4tXPFFQ@mail.gmail.com>
Date:	Tue, 7 Feb 2012 00:38:58 -0500
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	Anton Vorontsov <anton.vorontsov@...aro.org>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	Arve Hjønnevåg <arve@...roid.com>,
	San Mehat <san@...gle.com>, Colin Cross <ccross@...roid.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, kernel-team@...roid.com,
	linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH v2 2/6] oom: Get rid of sparse warnings

>> task struct only have allock_lock, not alloc_loc.
>
> Funnily, but sparse does not care. :-) __release(foo) will work as
> well. Seems like sparse counts locking balance globally.
>
> This is now fixed in the patch down below, thanks for catching.
>
>> Moreover we don't release
>> the lock in this code path. Seems odd.
>
> Indeed. That's exactly what sparse seeing is as well. We exit
> without releasing the lock, which is bad (in sparse' eyes). So
> we lie to sparse, telling it that we do release, so it shut ups.

Hmmm....

To be honest, I really dislike any lie annotation. Why? It is very
fragile and easily
become broken from unrelated but near line changes. Please consider to
enhance sparse at first.
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