linux-kernel - Re: [PATCH] generic-ipi: add lock context annotations

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Date:	Tue, 23 Nov 2010 09:49:56 +0100
From:	Jens Axboe <jaxboe@...ionio.com>
To:	Namhyung Kim <namhyung@...il.com>
CC:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] generic-ipi: add lock context annotations

On 2010-11-23 04:19, Namhyung Kim wrote:
> 2010-11-22 (월), 13:46 +0100, Peter Zijlstra:
>> On Mon, 2010-11-22 at 16:33 +0900, Namhyung Kim wrote:
>>> The ipi_call_[un]lock[_irq] functions grab/release a spin lock
>>> but were missing proper annotations. Add it.
>>
>> I really have to ask why bother? Why not add some smarts to whatever
>> uses these annotations?
> 
> I just thought that removing bogus warnings from sparse helps us focus
> on real issues when using it. Currently sparse emits too many messages
> and some (many?) of them might be removed trivially (or by adding bit of
> ugliness. :( )

It's not too big a deal, I have no problem adding the annotation.

> BTW, I didn't get what you mean about "some smarts". Could you explain
> them little more?

I guess what Peter means is that the fact that the function grabs the
lock is apparent in the code, if sparse was a bit "smarter", it would
see and note this itself.

-- 
Jens Axboe

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