[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>

17 files changed, 10 insertions, 137 deletions

diff --git a/arch/alpha/kernel/time.c b/arch/alpha/kernel/time.c
index d7053eb4ffcf..4748e14a28bc 100644
--- a/arch/alpha/kernel/time.c
+++ b/arch/alpha/kernel/time.c
@@ -91,17 +91,6 @@ static inline __u32 rpcc(void)
 }
 
 /*
- * 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
  */
diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c
index 3c8cdcfe8d4a..ee47c532e210 100644
--- a/arch/arm/kernel/time.c
+++ b/arch/arm/kernel/time.c
@@ -78,16 +78,6 @@ 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
  * printk_clock is enabled.
diff --git a/arch/arm26/kernel/time.c b/arch/arm26/kernel/time.c
index 1206469b2b86..0f1d57fbd3d7 100644
--- a/arch/arm26/kernel/time.c
+++ b/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;
 
 /*
diff --git a/arch/avr32/kernel/time.c b/arch/avr32/kernel/time.c
index 5a247ba71a72..a2f74affaa98 100644
--- a/arch/avr32/kernel/time.c
+++ b/arch/avr32/kernel/time.c
@@ -110,15 +110,6 @@ static void avr32_hpt_init(unsigned int 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.
  *
diff --git a/arch/cris/kernel/time.c b/arch/cris/kernel/time.c
index 22a1aa511aea..acfd04559405 100644
--- a/arch/cris/kernel/time.c
+++ b/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)
 {
diff --git a/arch/h8300/kernel/time.c b/arch/h8300/kernel/time.c
index 8abab3bc2b6f..d1ef615ba895 100644
--- a/arch/h8300/kernel/time.c
+++ b/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);
-
-}
diff --git a/arch/m32r/kernel/time.c b/arch/m32r/kernel/time.c
index a09038282c78..3858c9f39ba5 100644
--- a/arch/m32r/kernel/time.c
+++ b/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);
-}
diff --git a/arch/m68k/kernel/time.c b/arch/m68k/kernel/time.c
index 2a599c3ed787..4c065f9ceffc 100644
--- a/arch/m68k/kernel/time.c
+++ b/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);
-}
-
diff --git a/arch/m68knommu/kernel/time.c b/arch/m68knommu/kernel/time.c
index 11ea217ed5cf..467053da2d08 100644
--- a/arch/m68knommu/kernel/time.c
+++ b/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);
diff --git a/arch/mips/kernel/time.c b/arch/mips/kernel/time.c
index 8aa544f73a5e..545fcbc8cea2 100644
--- a/arch/mips/kernel/time.c
+++ b/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);
-}
diff --git a/arch/parisc/kernel/time.c b/arch/parisc/kernel/time.c
index bad7d1eb62b9..5f1b51af06a9 100644
--- a/arch/parisc/kernel/time.c
+++ b/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();
diff --git a/arch/sh/kernel/time.c b/arch/sh/kernel/time.c
index c206c9504c4b..d47e775962e9 100644
--- a/arch/sh/kernel/time.c
+++ b/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)
 {
diff --git a/arch/sh64/kernel/time.c b/arch/sh64/kernel/time.c
index 9c4a38a8698c..390b40de7cef 100644
--- a/arch/sh64/kernel/time.c
+++ b/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);
-}
-
diff --git a/arch/sparc/kernel/time.c b/arch/sparc/kernel/time.c
index 2fcce000d877..9bb1240aaf8a 100644
--- a/arch/sparc/kernel/time.c
+++ b/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.)
diff --git a/arch/v850/kernel/time.c b/arch/v850/kernel/time.c
index cd06f47c0ea7..486e3a441c86 100644
--- a/arch/v850/kernel/time.c
+++ b/arch/v850/kernel/time.c
@@ -28,14 +28,6 @@
 #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
  */
diff --git a/arch/xtensa/kernel/time.c b/arch/xtensa/kernel/time.c
index a350431363a0..22949be4a5d8 100644
--- a/arch/xtensa/kernel/time.c
+++ b/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,
diff --git a/kernel/sched.c b/kernel/sched.c
index cca93cc0dd7d..1cd4ee769e20 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -57,6 +57,16 @@
 #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 ],
  * and back.