[PATCH] Consolidate default sched_clock()

Use attribute(weak).

Signed-off-by: Alexey Dobriyan <adobriyan@openvz.org>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/alpha/kernel/time.c

@@ -90,17 +90,6 @@ static inline __u32 rpcc(void)
     return result;
 }
 
-/*
- * Scheduler clock - returns current time in nanosec units.
- *
- * Copied from ARM code for expediency... ;-}
- */
-unsigned long long sched_clock(void)
-{
-        return (unsigned long long)jiffies * (1000000000 / HZ);
-}
-
-
 /*
  * timer_interrupt() needs to keep up the real-time clock,
  * as well as call the "do_timer()" routine every clocktick

arch/arm/kernel/time.c

@@ -77,16 +77,6 @@ static unsigned long dummy_gettimeoffset(void)
 }
 #endif
 
-/*
- * Scheduler clock - returns current time in nanosec units.
- * This is the default implementation.  Sub-architecture
- * implementations can override this.
- */
-unsigned long long __attribute__((weak)) sched_clock(void)
-{
-	return (unsigned long long)jiffies * (1000000000 / HZ);
-}
-
 /*
  * An implementation of printk_clock() independent from
  * sched_clock().  This avoids non-bootable kernels when

arch/arm26/kernel/time.c

@@ -89,14 +89,6 @@ static unsigned long gettimeoffset(void)
         return (offset + LATCH/2) / LATCH;
 }
 
-/*
- * Scheduler clock - returns current time in nanosec units.
- */
-unsigned long long sched_clock(void)
-{
-	return (unsigned long long)jiffies * (1000000000 / HZ);
-}
-
 static unsigned long next_rtc_update;
 
 /*

arch/avr32/kernel/time.c

@@ -109,15 +109,6 @@ static void avr32_hpt_init(unsigned int count)
 	sysreg_write(COUNT, count);
 }
 
-/*
- * Scheduler clock - returns current time in nanosec units.
- */
-unsigned long long sched_clock(void)
-{
-	/* There must be better ways...? */
-	return (unsigned long long)jiffies * (1000000000 / HZ);
-}
-
 /*
  * local_timer_interrupt() does profiling and process accounting on a
  * per-CPU basis.

arch/cris/kernel/time.c

@@ -216,14 +216,6 @@ cris_do_profile(struct pt_regs* regs)
 #endif
 }
 
-/*
- * Scheduler clock - returns current time in nanosec units.
- */
-unsigned long long sched_clock(void)
-{
-	return (unsigned long long)jiffies * (1000000000 / HZ);
-}
-
 static int
 __init init_udelay(void)
 {

arch/h8300/kernel/time.c

@@ -118,9 +118,3 @@ int do_settimeofday(struct timespec *tv)
 }
 
 EXPORT_SYMBOL(do_settimeofday);
-
-unsigned long long sched_clock(void)
-{
-	return (unsigned long long)jiffies * (1000000000 / HZ);
-
-}

arch/m32r/kernel/time.c

@@ -286,11 +286,3 @@ void __init time_init(void)
 #error no chip configuration
 #endif
 }
-
-/*
- *  Scheduler clock - returns current time in nanosec units.
- */
-unsigned long long sched_clock(void)
-{
-	return (unsigned long long)jiffies * (1000000000 / HZ);
-}

arch/m68k/kernel/time.c

@@ -159,12 +159,3 @@ int do_settimeofday(struct timespec *tv)
 }
 
 EXPORT_SYMBOL(do_settimeofday);
-
-/*
- * Scheduler clock - returns current time in ns units.
- */
-unsigned long long sched_clock(void)
-{
-       return (unsigned long long)jiffies*(1000000000/HZ);
-}
-

arch/m68knommu/kernel/time.c

@@ -174,13 +174,4 @@ int do_settimeofday(struct timespec *tv)
 	clock_was_set();
 	return 0;
 }
-
-/*
- * Scheduler clock - returns current time in nanosec units.
- */
-unsigned long long sched_clock(void)
-{
-	return (unsigned long long)jiffies * (1000000000 / HZ);
-}
-
 EXPORT_SYMBOL(do_settimeofday);

arch/mips/kernel/time.c

@@ -455,8 +455,3 @@ EXPORT_SYMBOL(rtc_lock);
 EXPORT_SYMBOL(to_tm);
 EXPORT_SYMBOL(rtc_mips_set_time);
 EXPORT_SYMBOL(rtc_mips_get_time);
-
-unsigned long long sched_clock(void)
-{
-	return (unsigned long long)jiffies*(1000000000/HZ);
-}

arch/parisc/kernel/time.c

@@ -288,17 +288,6 @@ do_settimeofday (struct timespec *tv)
 }
 EXPORT_SYMBOL(do_settimeofday);
 
-/*
- * XXX: We can do better than this.
- * Returns nanoseconds
- */
-
-unsigned long long sched_clock(void)
-{
-	return (unsigned long long)jiffies * (1000000000 / HZ);
-}
-
-
 void __init start_cpu_itimer(void)
 {
 	unsigned int cpu = smp_processor_id();

arch/sh/kernel/time.c

@@ -41,14 +41,6 @@ static int null_rtc_set_time(const time_t secs)
 void (*rtc_sh_get_time)(struct timespec *) = null_rtc_get_time;
 int (*rtc_sh_set_time)(const time_t) = null_rtc_set_time;
 
-/*
- * Scheduler clock - returns current time in nanosec units.
- */
-unsigned long long __attribute__ ((weak)) sched_clock(void)
-{
-	return (unsigned long long)jiffies * (1000000000 / HZ);
-}
-
 #ifndef CONFIG_GENERIC_TIME
 void do_gettimeofday(struct timeval *tv)
 {

arch/sh64/kernel/time.c

@@ -579,12 +579,3 @@ void enter_deep_standby(void)
 	asm __volatile__ ("nop");
 	panic("Unexpected wakeup!\n");
 }
-
-/*
- * Scheduler clock - returns current time in nanosec units.
- */
-unsigned long long sched_clock(void)
-{
-	return (unsigned long long)jiffies * (1000000000 / HZ);
-}
-

arch/sparc/kernel/time.c

@@ -436,15 +436,6 @@ static inline unsigned long do_gettimeoffset(void)
 	return (*master_l10_counter >> 10) & 0x1fffff;
 }
 
-/*
- * Returns nanoseconds
- * XXX This is a suboptimal implementation.
- */
-unsigned long long sched_clock(void)
-{
-	return (unsigned long long)jiffies * (1000000000 / HZ);
-}
-
 /* Ok, my cute asm atomicity trick doesn't work anymore.
  * There are just too many variables that need to be protected
  * now (both members of xtime, et al.)

arch/v850/kernel/time.c

@@ -27,14 +27,6 @@
 
 #define TICK_SIZE	(tick_nsec / 1000)
 
-/*
- * Scheduler clock - returns current time in nanosec units.
- */
-unsigned long long sched_clock(void)
-{
-	return (unsigned long long)jiffies * (1000000000 / HZ);
-}
-
 /*
  * timer_interrupt() needs to keep up the real-time clock,
  * as well as call the "do_timer()" routine every clocktick

arch/xtensa/kernel/time.c

@@ -38,15 +38,6 @@ unsigned long ccount_nsec;		/* nsec per ccount increment */
 unsigned int last_ccount_stamp;
 static long last_rtc_update = 0;
 
-/*
- * Scheduler clock - returns current tim in nanosec units.
- */
-
-unsigned long long sched_clock(void)
-{
-	return (unsigned long long)jiffies * (1000000000 / HZ);
-}
-
 static irqreturn_t timer_interrupt(int irq, void *dev_id);
 static struct irqaction timer_irqaction = {
 	.handler =	timer_interrupt,

kernel/sched.c

@@ -56,6 +56,16 @@
 
 #include <asm/unistd.h>
 
+/*
+ * Scheduler clock - returns current time in nanosec units.
+ * This is default implementation.
+ * Architectures and sub-architectures can override this.
+ */
+unsigned long long __attribute__((weak)) sched_clock(void)
+{
+	return (unsigned long long)jiffies * (1000000000 / HZ);
+}
+
 /*
  * Convert user-nice values [ -20 ... 0 ... 19 ]
  * to static priority [ MAX_RT_PRIO..MAX_PRIO-1 ],