linux-kernel - Re: [opensuse-kernel] Re: [PATCH] include/log2.h: Fix rounddown_pow_of

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Message-ID: <4EC5966A.4000106@opensuse.org>
Date:	Thu, 17 Nov 2011 20:19:06 -0300
From:	Cristian Rodríguez <crrodriguez@...nsuse.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Andrei Warkentin <andreiw@...are.com>,
	linux-kernel@...r.kernel.org,
	Rolf Eike Beer <eike-kernel@...tec.de>,
	opensuse-kernel@...nsuse.org,
	Sergiu Iordache <sergiu@...omium.org>,
	Marco Stornelli <marco.stornelli@...il.com>,
	Eddie Wai <eddie.wai@...adcom.com>,
	Jayamohan Kallickal <jayamohan.kallickal@...lex.com>,
	Guennadi Liakhovetski <g.liakhovetski@....de>
Subject: Re: [opensuse-kernel] Re: [PATCH] include/log2.h: Fix rounddown_pow_of_two(1)

On 17/11/11 20:05, Andrew Morton wrote:

> I assume that nobody has gone off and checked whether all current
> callers will survive this change.  If they had, they'd have looked in
> drivers/char/ramoops.c and seen:
> 
> 	rounddown_pow_of_two(pdata->mem_size);
> 	rounddown_pow_of_two(pdata->record_size);
> 
> These operations are no-ops.  It should be
> 
> 	pdata->mem_size = rounddown_pow_of_two(pdata->mem_size);
> 	pdata->record_size = rounddown_pow_of_two(pdata->record_size);
> 
> That we have this many warts using these interfaces is an indication
> that the interfaces aren't very good.  Poorly documented, at least.
> 

making that macro an inline function and annotating with
__attribute__((warn_unused_result)) looks like a good start for me.

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