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authorHelge Deller <deller@gmx.de>2007-02-10 04:45:40 -0500
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-11 13:51:31 -0500
commit3db5db4fcdafc85b99d171336a7d2f25765ccd13 (patch)
tree5fb1f991a7eb0de9fcab48d1a889f4324c823077 /kernel/timer.c
parentfc0ecff698165ae8e178efa086e0dd1f385206b1 (diff)
[PATCH] use cycle_t instead of u64 in struct time_interpolator
The 32bit and 64bit PARISC Linux kernels suffers from the problem, that the gettimeofday() call sometimes returns non-monotonic times. The easiest way to fix this, is to drop the PARISC-specific implementation and switch over to the generic TIME_INTERPOLATION framework. But in order to make it even compile on 32bit PARISC, the patch below which touches the generic Linux code, is mandatory. More information and the full patch with the parisc-specific changes is included in this thread: http://lists.parisc-linux.org/pipermail/parisc-linux/2006-December/031003.html As far as I could see, this patch does not change anything for the existing architectures which use this framework (IA64 and SPARC64), since "cycles_t" is defined there as unsigned 64bit-integer anyway (which then makes this patch a no-change for them). Signed-off-by: Helge Deller <deller@gmx.de> Cc: <linux-arch@vger.kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/timer.c')
-rw-r--r--kernel/timer.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/timer.c b/kernel/timer.c
index c2a8ccfc2882..d38801a95866 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -1624,7 +1624,7 @@ struct time_interpolator *time_interpolator __read_mostly;
1624static struct time_interpolator *time_interpolator_list __read_mostly; 1624static struct time_interpolator *time_interpolator_list __read_mostly;
1625static DEFINE_SPINLOCK(time_interpolator_lock); 1625static DEFINE_SPINLOCK(time_interpolator_lock);
1626 1626
1627static inline u64 time_interpolator_get_cycles(unsigned int src) 1627static inline cycles_t time_interpolator_get_cycles(unsigned int src)
1628{ 1628{
1629 unsigned long (*x)(void); 1629 unsigned long (*x)(void);
1630 1630
@@ -1650,8 +1650,8 @@ static inline u64 time_interpolator_get_counter(int writelock)
1650 1650
1651 if (time_interpolator->jitter) 1651 if (time_interpolator->jitter)
1652 { 1652 {
1653 u64 lcycle; 1653 cycles_t lcycle;
1654 u64 now; 1654 cycles_t now;
1655 1655
1656 do { 1656 do {
1657 lcycle = time_interpolator->last_cycle; 1657 lcycle = time_interpolator->last_cycle;