From: Sujit Karataparambil <sjt.kar@gmail.com>
To: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
Cc: linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH] ARM: __builtin_return_address works with argument 0
Date: Wed, 13 May 2009 18:33:12 +0530 [thread overview]
Message-ID: <921ca19c0905130603g3823b213vdb2b62b75934104d@mail.gmail.com> (raw)
In-Reply-To: <1242205213-27452-1-git-send-email-u.kleine-koenig@pengutronix.de>
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@pengutronix.de>:
> This saves the function overhead for CALLER_ADDRESS0.
>
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
> Cc: Thomas Gleixner <tglx@linutronix.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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prev parent reply other threads:[~2009-05-13 13:03 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-13 9:00 [PATCH] ARM: __builtin_return_address works with argument 0 Uwe Kleine-König
2009-05-13 13:03 ` Sujit Karataparambil [this message]
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