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authorHidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>2009-11-26 00:49:27 -0500
committerIngo Molnar <mingo@elte.hu>2009-11-26 06:59:20 -0500
commitb7b20df91d43d5e59578b8fc16e895c0c8cbd9b5 (patch)
tree9ad1a2347264db548a161575080ed3bdc32f6d51 /kernel/sched.c
parentd5b7c78e975302a1bab28263266c39ecb71acad4 (diff)
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.c3
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)
5192#else 5192#else
5193 5193
5194#ifndef nsecs_to_cputime 5194#ifndef nsecs_to_cputime
5195# define nsecs_to_cputime(__nsecs) \ 5195# define nsecs_to_cputime(__nsecs) nsecs_to_jiffies(__nsecs)
5196 msecs_to_cputime(div_u64((__nsecs), NSEC_PER_MSEC))
5197#endif 5196#endif
5198 5197
5199void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st) 5198void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st)