linux-kernel - Re: [PATCH 1/2] ftrace - add notrace to sched

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Date:	Sat, 6 Mar 2010 02:09:32 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Tim Bird <tim.bird@...sony.com>
Cc:	Tony Lindgren <tony@...mide.com>,
	Russell King <rmk@....linux.org.uk>,
	linux-arm-kernel <linux-arm-kernel@...ts.arm.linux.org.uk>,
	linux kernel <linux-kernel@...r.kernel.org>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [PATCH 1/2] ftrace - add notrace to sched_clock on various arm
	platforms

On Fri, Mar 05, 2010 at 04:29:05PM -0800, Tim Bird wrote:
> Add notrace attribute to sched_clock, and
> subsidiary clock routines, to avoid
> recursion within ftrace.
> 
> Signed-off-by: Tim Bird <tim.bird@...sony.com>
> ---
>  arch/arm/mach-mmp/time.c       |    2 +-
>  arch/arm/mach-pxa/time.c       |    2 +-
>  arch/arm/mach-realview/core.c  |    2 +-
>  arch/arm/mach-sa1100/generic.c |    2 +-
>  arch/arm/mach-versatile/core.c |    2 +-
>  arch/arm/plat-omap/common.c    |   14 +++++++-------
>  arch/arm/plat-omap/io.c        |    2 +-
>  7 files changed, 13 insertions(+), 13 deletions(-)
> 
> --- a/arch/arm/mach-mmp/time.c
> +++ b/arch/arm/mach-mmp/time.c
> @@ -72,7 +72,7 @@ static inline uint32_t timer_read(void)
>  	return __raw_readl(TIMERS_VIRT_BASE + TMR_CVWR(0));
>  }
> 
> -unsigned long long sched_clock(void)
> +unsigned long long notrace sched_clock(void)
>  {
>  	unsigned long long v = cnt32_to_63(timer_read());
>  	return (v * tcr2ns_scale) >> TCR2NS_SCALE_FACTOR;
> --- a/arch/arm/mach-pxa/time.c
> +++ b/arch/arm/mach-pxa/time.c
> @@ -51,7 +51,7 @@ static void __init set_oscr2ns_scale(uns
>  		oscr2ns_scale++;
>  }



sched_clock() already has notrace in its prototype in
sched.h

>  #ifdef CONFIG_ARCH_OMAP16XX
> -static cycle_t omap16xx_32k_read(struct clocksource *cs)
> +static cycle_t notrace omap16xx_32k_read(struct clocksource *cs)
>  {
>  	return omap_readl(OMAP16XX_TIMER_32K_SYNCHRONIZED);
>  }
> @@ -110,7 +110,7 @@ static cycle_t omap16xx_32k_read(struct
>  #endif



But for the things it calls yeah it's required.

Thanks.

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