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[PATCH] use cycle_t instead of u64 in struct time_interpolator

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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>
This commit is contained in:
Helge Deller 2007-02-10 01:45:40 -08:00 • committed by Linus Torvalds
parent fc0ecff698
commit 3db5db4fcd
2 changed files with 5 additions and 5 deletions
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6
kernel/timer.c
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@ -1624,7 +1624,7 @@ struct time_interpolator *time_interpolator __read_mostly;
static struct time_interpolator *time_interpolator_list __read_mostly;
static DEFINE_SPINLOCK(time_interpolator_lock);
static inline u64 time_interpolator_get_cycles(unsigned int src)
static inline cycles_t time_interpolator_get_cycles(unsigned int src)
{
unsigned long (*x)(void);
@ -1650,8 +1650,8 @@ static inline u64 time_interpolator_get_counter(int writelock)
if (time_interpolator->jitter)
{
u64 lcycle;
u64 now;
cycles_t lcycle;
cycles_t now;
do {
lcycle = time_interpolator->last_cycle;