linux-kernel - Re: [PATCH 1/2] compiler: Introduce __always

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Message-ID: <4AEE3E39.4070403@cn.fujitsu.com>
Date:	Mon, 02 Nov 2009 10:04:41 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Arjan van de Ven <arjan@...radead.org>
CC:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] compiler: Introduce __always_unused

Arjan van de Ven wrote:
> On Mon, 02 Nov 2009 08:50:52 +0800
> Li Zefan <lizf@...fujitsu.com> wrote:
> 
> Hi,
> 
>> I wrote some code which is used as compile-time checker, and the
>> code should be elided after compile.
>> +#define __always_unused
>> __attribute__((unused)) 
> 
> I have a suggestion.
> In addition to marking it attribute unused, would it be useful to also
> put a section attribute as part of this, to a section that we can then
> drop from the binary by way of the linker script ?
> 

__unused is used to suppress define-but-unused warning. If the
annotated symbol is really unused, it will be optimized out,
so I think we don't need to add a section for this.

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