linux-kernel - Re: [PATCH] __used is needed for function referenced only from inline asm

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Message-ID: <Pine.LNX.4.64.0811240948130.30025@anakin>
Date:	Mon, 24 Nov 2008 09:57:20 +0100 (CET)
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Török Edwin <edwintorok@...il.com>
cc:	Ingo Molnar <mingo@...e.hu>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	David Howells <dhowells@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] __used is needed for function referenced only from inline
 asm

On Mon, 24 Nov 2008, Török Edwin wrote:
> According to the gcc manual, the 'used' attribute should be applied to
> functions referenced only from inline assembly.
> This fixes a build failure with llvm-gcc-4.2, which deleted
> __mutex_lock_slowpath, __mutex_unlock_slowpath.
> 
> Signed-off-by: Török Edwin <edwintorok@...il.com>
> ---
>  kernel/mutex.c |    8 ++++----
>  1 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/kernel/mutex.c b/kernel/mutex.c
> index 39a3816..4f45d4b 100644
> --- a/kernel/mutex.c
> +++ b/kernel/mutex.c
> @@ -59,7 +59,7 @@ EXPORT_SYMBOL(__mutex_init);
>   * We also put the fastpath first in the kernel image, to make sure the
>   * branch is predicted by the CPU as default-untaken.
>   */
> -static void noinline __sched
> +static __used noinline void __sched

Perhaps we should incorporate it into `noinline'?

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds
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