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ARM: make sched_clock just call a function pointer

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This converts sched_clock to simply a call to a function pointer in order
to allow overriding it. This will allow for use with 64-bit counters where
overflow handling is not needed.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
This commit is contained in:
Rob Herring 2013-04-01 13:53:38 -05:00
parent c115739da8
commit 7e48c0b9d9
2 changed files with 10 additions and 1 deletions
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2
arch/arm/include/asm/sched_clock.h
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@ -11,4 +11,6 @@
extern void sched_clock_postinit(void); extern void sched_clock_postinit(void);
extern void setup_sched_clock(u32 (*read)(void), int bits, unsigned long rate); extern void setup_sched_clock(u32 (*read)(void), int bits, unsigned long rate);
extern unsigned long long (*sched_clock_func)(void);
#endif #endif

9
arch/arm/kernel/sched_clock.c
View file

@ -165,12 +165,19 @@ void __init setup_sched_clock(u32 (*read)(void), int bits, unsigned long rate)
pr_debug("Registered %pF as sched_clock source\n", read); pr_debug("Registered %pF as sched_clock source\n", read);
} }
unsigned long long notrace sched_clock(void) static unsigned long long notrace sched_clock_32(void)
{ {
u32 cyc = read_sched_clock(); u32 cyc = read_sched_clock();
return cyc_to_sched_clock(cyc, sched_clock_mask); return cyc_to_sched_clock(cyc, sched_clock_mask);
} }
unsigned long long __read_mostly (*sched_clock_func)(void) = sched_clock_32;
unsigned long long notrace sched_clock(void)
{
return sched_clock_func();
}
void __init sched_clock_postinit(void) void __init sched_clock_postinit(void)
{ {
/* /*