Since implementing highres timers on powerpc the clock_getres syscall
has reported different resolutions due to the vdso using the a low res
value. In the patch d7f71674ad7c3c4467e48f6ab9e85516dae2720
([POWERPC] Use a sensible default for clock_getres() in the VDSO), the
powerpc vdso was updated to use the correct value.
This fix doesn't work on older compilers. Below is a fix for powerpc,
that introduces a new (generic) #define MONOTONIC_RES_NSEC which is
equal to the 64 value stored in KTIME_MONOTONIC_RES.
Signed-off-by: Tony Breeds <[EMAIL PROTECTED]>
---
Thomas, If this is okay with you can it go through Paul's tree?
arch/powerpc/kernel/asm-offsets.c | 2 +-
include/linux/hrtimer.h | 5 ++++-
include/linux/ktime.h | 3 ++-
3 files changed, 7 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/kernel/asm-offsets.c
b/arch/powerpc/kernel/asm-offsets.c
index e6e4928..4b749c4 100644
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -313,7 +313,7 @@ int main(void)
DEFINE(CLOCK_REALTIME, CLOCK_REALTIME);
DEFINE(CLOCK_MONOTONIC, CLOCK_MONOTONIC);
DEFINE(NSEC_PER_SEC, NSEC_PER_SEC);
- DEFINE(CLOCK_REALTIME_RES, (KTIME_MONOTONIC_RES).tv64);
+ DEFINE(CLOCK_REALTIME_RES, MONOTONIC_RES_NSEC);
#ifdef CONFIG_BUG
DEFINE(BUG_ENTRY_SIZE, sizeof(struct bug_entry));
diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 7a9398e..8dba081 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -223,11 +223,14 @@ static inline ktime_t hrtimer_cb_get_time(struct hrtimer
*timer)
* idea of the (in)accuracy of timers. Timer values are rounded up to
* this resolution values.
*/
-# define KTIME_HIGH_RES (ktime_t) { .tv64 = 1 }
+# define HIGH_RES_NSEC 1
+# define KTIME_HIGH_RES (ktime_t) { .tv64 = HIGH_RES_NSEC }
+# define MONOTONIC_RES_NSEC HIGH_RES_NSEC
# define KTIME_MONOTONIC_RES KTIME_HIGH_RES
#else
+# define MONOTONIC_RES_NSEC LOW_RES_NSEC
# define KTIME_MONOTONIC_RES KTIME_LOW_RES
/*
diff --git a/include/linux/ktime.h b/include/linux/ktime.h
index a6ddec1..36c542b 100644
--- a/include/linux/ktime.h
+++ b/include/linux/ktime.h
@@ -316,7 +316,8 @@ static inline ktime_t ktime_sub_us(const ktime_t kt, const
u64 usec)
* idea of the (in)accuracy of timers. Timer values are rounded up to
* this resolution values.
*/
-#define KTIME_LOW_RES (ktime_t){ .tv64 = TICK_NSEC }
+#define LOW_RES_NSEC TICK_NSEC
+#define KTIME_LOW_RES (ktime_t){ .tv64 = LOW_RES_NSEC }
/* Get the monotonic time in timespec format: */
extern void ktime_get_ts(struct timespec *ts);
Yours Tony
linux.conf.au http://linux.conf.au/ || http://lca2008.linux.org.au/
Jan 28 - Feb 02 2008 The Australian Linux Technical Conference!
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