linux-kernel - Re: [PATCH] check spinlock_t/rwlock_t argument type on non-SMP builds

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Message-ID: <20090703073801.GA10191@elte.hu>
Date:	Fri, 3 Jul 2009 09:38:01 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	David Kilroy <kilroyd@...glemail.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] check spinlock_t/rwlock_t argument type on non-SMP
	builds


* David Kilroy <kilroyd@...glemail.com> wrote:

> When writing code for UP without CONFIG_DEBUG_SPINLOCK it's easy 
> to get the first argument to the spinlock/rwlock functions wrong. 
> This is because the parameter is not actually used in this 
> configuration.
> 
> Typically you will only find out it's wrong
>  * by rebuilding with CONFIG_SMP or CONFIG_DEBUG_SPINLOCK
>  * after you've submitted your beautiful patch series.
> 
> The first means a long wait, and the latter is a bit late.
> 
> Add typechecking on the first argument of these macro functions. 
> Note that since the typecheck now references the variable, the 
> explicit read is redundant and can be removed.
> 
> This change causes compiler warnings in net/ipv4/route.c, as this 
> passes NULL as the first argument in the UP configuration. Simply 
> cast this.

Wondering - can the wrappers be moved from CPP land to C land by 
turning them into inlines? (i havent checked all usages so there 
might be some surprises, but by and large it ought to be possible.)

	Ingo
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