lkml.org 
[lkml]   [2009]   [May]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 1/2] ftrace: add notrace to ARM sched_clock routines
On Fri, May 01, 2009 at 03:30:05PM -0700, Tim Bird wrote:
> Add notrace attribute to sched_clock, to avoid
> recursion with ftrace function_graph tracing.
>
> Signed-off-by: Tim Bird <tim.bird@am.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 | 4 ++--
> 6 files changed, 7 insertions(+), 7 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++;
> }
>
> -unsigned long long sched_clock(void)
> +unsigned long long notrace sched_clock(void)
> {
> unsigned long long v = cnt32_to_63(OSCR);
> return (v * oscr2ns_scale) >> OSCR2NS_SCALE_FACTOR;
> --- a/arch/arm/mach-realview/core.c
> +++ b/arch/arm/mach-realview/core.c
> @@ -60,7 +60,7 @@ void __iomem *gic_cpu_base_addr;
> * This is the RealView sched_clock implementation. This has
> * a resolution of 41.7ns, and a maximum value of about 179s.
> */
> -unsigned long long sched_clock(void)
> +unsigned long long notrace sched_clock(void)
> {
> unsigned long long v;
>
> --- a/arch/arm/mach-sa1100/generic.c
> +++ b/arch/arm/mach-sa1100/generic.c
> @@ -131,7 +131,7 @@ EXPORT_SYMBOL(cpufreq_get);
> *
> * ( * 1E9 / 3686400 => * 78125 / 288)
> */
> -unsigned long long sched_clock(void)
> +unsigned long long notrace sched_clock(void)
> {
> unsigned long long v = cnt32_to_63(OSCR);
>
> --- a/arch/arm/mach-versatile/core.c
> +++ b/arch/arm/mach-versatile/core.c
> @@ -237,7 +237,7 @@ void __init versatile_map_io(void)
> * long as there is always less than 89 seconds between successive
> * calls to this function.
> */
> -unsigned long long sched_clock(void)
> +unsigned long long notrace sched_clock(void)
> {
> unsigned long long v = cnt32_to_63(readl(VERSATILE_REFCOUNTER));
>
> --- a/arch/arm/plat-omap/common.c
> +++ b/arch/arm/plat-omap/common.c
> @@ -185,7 +185,7 @@ console_initcall(omap_add_serial_console
>
> #include <linux/clocksource.h>
>
> -static cycle_t omap_32k_read(struct clocksource *cs)
> +static cycle_t notrace omap_32k_read(struct clocksource *cs)
> {
> return omap_readl(TIMER_32K_SYNCHRONIZED);
> }
> @@ -203,7 +203,7 @@ static struct clocksource clocksource_32
> * Returns current time from boot in nsecs. It's OK for this to wrap
> * around for now, as it's just a relative time stamp.
> */
> -unsigned long long sched_clock(void)
> +unsigned long long notrace sched_clock(void)
> {
> unsigned long long ret;


I've looked into all of these functions and they don't seem to call
anything that could be traced. I could have missed something though
but it looks good.

Acked-by: Frederic Weisbecker <fweisbec@gmail.com>



\
 
 \ /
  Last update: 2009-05-02 01:41    [W:0.824 / U:0.232 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site