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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 /kernel/sched.c | |
| parent | d5b7c78e975302a1bab28263266c39ecb71acad4 (diff) | |
| download | linux-b7b20df91d43d5e59578b8fc16e895c0c8cbd9b5.tar.bz2 | |
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 'kernel/sched.c')
| -rw-r--r-- | kernel/sched.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 82251c21f785..b3d4e2be95aa 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -5192,8 +5192,7 @@ void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st) #else #ifndef nsecs_to_cputime -# define nsecs_to_cputime(__nsecs) \ - msecs_to_cputime(div_u64((__nsecs), NSEC_PER_MSEC)) +# define nsecs_to_cputime(__nsecs) nsecs_to_jiffies(__nsecs) #endif void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st) |