linux-kernel - Re: [PATCH 1/2] irq_flags_t: intro and core annotations

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Date:	Thu, 25 Oct 2007 17:40:03 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Alexey Dobriyan <adobriyan@...il.com>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] irq_flags_t: intro and core annotations

Hi,

On Oct 21 2007, Alexey Dobriyan wrote:
>
>One of type of bugs steadily being fought is the following one:
>
>	unsigned int flags;
>	spin_lock_irqsave(&lock, flags);
>
>where "flags" should be "unsigned long". Here is far from complete list 
>of commits fixing such bugs:
>

How about making spin_lock_irqsave actually take a pointer to flags? 
(Which would be the logical choice if it were a function and not a 
macro...) That would flag up all violations ("without cast to different 
pointer" or so) while usually not breaking compilation.

Of course, irq_flags_t is probably the best long-term solution if one 
wants to hide a struct. (Even then perhaps, use a pointer instead?)
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