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authorJohn Stultz <johnstul@us.ibm.com>2010-07-14 00:56:21 (GMT)
committerThomas Gleixner <tglx@linutronix.de>2010-07-27 10:40:54 (GMT)
commitb0797b60d0067fe437baa97a743c7d9de98fd769 (patch)
tree65aa0c890ad3fa0b19554b6d0c6326dfb186270e /arch/powerpc/kernel/time.c
parent592913ecb87a9e06f98ddb55b298f1a66bf94c6b (diff)
downloadlinux-b0797b60d0067fe437baa97a743c7d9de98fd769.tar.xz
powerpc: Simplify update_vsyscall
Currently powerpc's update_vsyscall calls an inline update_gtod. However, both are straightforward, and there are no other users, so this patch merges update_gtod into update_vsyscall. Signed-off-by: John Stultz <johnstul@us.ibm.com> Cc: Anton Blanchard <anton@samba.org> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <1279068988-21864-5-git-send-email-johnstul@us.ibm.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/powerpc/kernel/time.c')
-rw-r--r--arch/powerpc/kernel/time.c55
1 files changed, 25 insertions, 30 deletions
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index 0441bbd..6fcd648 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -423,30 +423,6 @@ void udelay(unsigned long usecs)
}
EXPORT_SYMBOL(udelay);
-static inline void update_gtod(u64 new_tb_stamp, u64 new_stamp_xsec,
- u64 new_tb_to_xs)
-{
- /*
- * tb_update_count is used to allow the userspace gettimeofday code
- * to assure itself that it sees a consistent view of the tb_to_xs and
- * stamp_xsec variables. It reads the tb_update_count, then reads
- * tb_to_xs and stamp_xsec and then reads tb_update_count again. If
- * the two values of tb_update_count match and are even then the
- * tb_to_xs and stamp_xsec values are consistent. If not, then it
- * loops back and reads them again until this criteria is met.
- * We expect the caller to have done the first increment of
- * vdso_data->tb_update_count already.
- */
- vdso_data->tb_orig_stamp = new_tb_stamp;
- vdso_data->stamp_xsec = new_stamp_xsec;
- vdso_data->tb_to_xs = new_tb_to_xs;
- vdso_data->wtom_clock_sec = wall_to_monotonic.tv_sec;
- vdso_data->wtom_clock_nsec = wall_to_monotonic.tv_nsec;
- vdso_data->stamp_xtime = xtime;
- smp_wmb();
- ++(vdso_data->tb_update_count);
-}
-
#ifdef CONFIG_SMP
unsigned long profile_pc(struct pt_regs *regs)
{
@@ -876,7 +852,7 @@ static cycle_t timebase_read(struct clocksource *cs)
void update_vsyscall(struct timespec *wall_time, struct clocksource *clock,
u32 mult)
{
- u64 t2x, stamp_xsec;
+ u64 new_tb_to_xs, new_stamp_xsec;
if (clock != &clocksource_timebase)
return;
@@ -887,11 +863,30 @@ void update_vsyscall(struct timespec *wall_time, struct clocksource *clock,
/* XXX this assumes clock->shift == 22 */
/* 4611686018 ~= 2^(20+64-22) / 1e9 */
- t2x = (u64) mult * 4611686018ULL;
- stamp_xsec = (u64) xtime.tv_nsec * XSEC_PER_SEC;
- do_div(stamp_xsec, 1000000000);
- stamp_xsec += (u64) xtime.tv_sec * XSEC_PER_SEC;
- update_gtod(clock->cycle_last, stamp_xsec, t2x);
+ new_tb_to_xs = (u64) mult * 4611686018ULL;
+ new_stamp_xsec = (u64) xtime.tv_nsec * XSEC_PER_SEC;
+ do_div(new_stamp_xsec, 1000000000);
+ new_stamp_xsec += (u64) xtime.tv_sec * XSEC_PER_SEC;
+
+ /*
+ * tb_update_count is used to allow the userspace gettimeofday code
+ * to assure itself that it sees a consistent view of the tb_to_xs and
+ * stamp_xsec variables. It reads the tb_update_count, then reads
+ * tb_to_xs and stamp_xsec and then reads tb_update_count again. If
+ * the two values of tb_update_count match and are even then the
+ * tb_to_xs and stamp_xsec values are consistent. If not, then it
+ * loops back and reads them again until this criteria is met.
+ * We expect the caller to have done the first increment of
+ * vdso_data->tb_update_count already.
+ */
+ vdso_data->tb_orig_stamp = clock->cycle_last;
+ vdso_data->stamp_xsec = new_stamp_xsec;
+ vdso_data->tb_to_xs = new_tb_to_xs;
+ vdso_data->wtom_clock_sec = wall_to_monotonic.tv_sec;
+ vdso_data->wtom_clock_nsec = wall_to_monotonic.tv_nsec;
+ vdso_data->stamp_xtime = xtime;
+ smp_wmb();
+ ++(vdso_data->tb_update_count);
}
void update_vsyscall_tz(void)