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| author |   Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com> | 2009-11-26 14:49:27 +0900 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2009-11-26 12:59:20 +0100 |
| commit | b7b20df91d43d5e59578b8fc16e895c0c8cbd9b5 (patch) | |
| tree | 9ad1a2347264db548a161575080ed3bdc32f6d51 /include/linux/jiffies.h | |
| parent | sched: Remove task_{u,s,g}time() (diff) | |
| download | linux-dev-b7b20df91d43d5e59578b8fc16e895c0c8cbd9b5.tar.xz linux-dev-b7b20df91d43d5e59578b8fc16e895c0c8cbd9b5.zip | |
sched, time: Define nsecs_to_jiffies()
Use of msecs_to_jiffies() for nsecs_to_cputime() have some
problems:
- The type of msecs_to_jiffies()'s argument is unsigned int, so
it cannot convert msecs greater than UINT_MAX = about 49.7 days.
- msecs_to_jiffies() returns MAX_JIFFY_OFFSET if MSB of argument
is set, assuming that input was negative value. So it cannot
convert msecs greater than INT_MAX = about 24.8 days too.
This patch defines a new function nsecs_to_jiffies() that can
deal greater values, and that can deal all incoming values as
unsigned.
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: Spencer Candland <spencer@bluehost.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Amrico Wang <xiyou.wangcong@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: John Stultz <johnstul@linux.vnet.ibm.com>
LKML-Reference: <4B0E16E7.5070307@jp.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/jiffies.h')
| -rw-r--r-- | include/linux/jiffies.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/jiffies.h b/include/linux/jiffies.h index 1a9cf78bfce5..6811f4bfc6e7 100644 --- a/include/linux/jiffies.h +++ b/include/linux/jiffies.h @@ -307,6 +307,7 @@ extern clock_t jiffies_to_clock_t(long x); extern unsigned long clock_t_to_jiffies(unsigned long x); extern u64 jiffies_64_to_clock_t(u64 x); extern u64 nsec_to_clock_t(u64 x); +extern unsigned long nsecs_to_jiffies(u64 n); #define TIMESTAMP_SIZE 30 |