linux-kernel - Re: [PATCH] ARM: __builtin_return

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Message-ID: <921ca19c0905130603g3823b213vdb2b62b75934104d@mail.gmail.com>
Date:	Wed, 13 May 2009 18:33:12 +0530
From:	Sujit Karataparambil <sjt.kar@...il.com>
To:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Cc:	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] ARM: __builtin_return_address works with argument 0

These seem to be required too. Mostly for optimizations the compiler can
provide. Seem to be supported in gnu.

__builtin_clz
__builtin_constant_p
__builtin_expect
__builtin_frame_address

http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0376a/Caceiddh.html



2009/5/13 Uwe Kleine-König <u.kleine-koenig@...gutronix.de>:
> This saves the function overhead for CALLER_ADDRESS0.
>
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> ---
> Hi Thomas,
>
> this applies to .29.3-rt12.  Feel free to squash this into
> arm-tracing-updates.patch.
>
> Best regards
> Uwe
>
>  arch/arm/include/asm/ftrace.h |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/arch/arm/include/asm/ftrace.h b/arch/arm/include/asm/ftrace.h
> index 900fc19..f7e8bac 100644
> --- a/arch/arm/include/asm/ftrace.h
> +++ b/arch/arm/include/asm/ftrace.h
> @@ -15,7 +15,7 @@ extern void mcount(void);
>  void *return_address(unsigned int);
>
>  #define HAVE_ARCH_CALLER_ADDR
> -#define CALLER_ADDR0 ((unsigned long)return_address(0))
> +#define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
>  #define CALLER_ADDR1 ((unsigned long)return_address(1))
>  #define CALLER_ADDR2 ((unsigned long)return_address(2))
>  #define CALLER_ADDR3 ((unsigned long)return_address(3))
> --
> 1.6.2.1
>
> --
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-- 
-- Sujit K M
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