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authorHidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>2009-11-26 14:49:27 +0900
committerIngo Molnar <mingo@elte.hu>2009-11-26 12:59:20 +0100
commitb7b20df91d43d5e59578b8fc16e895c0c8cbd9b5 (patch)
tree9ad1a2347264db548a161575080ed3bdc32f6d51 /include/linux/jiffies.h
parentd5b7c78e975302a1bab28263266c39ecb71acad4 (diff)
downloadop-kernel-dev-b7b20df91d43d5e59578b8fc16e895c0c8cbd9b5.zip
op-kernel-dev-b7b20df91d43d5e59578b8fc16e895c0c8cbd9b5.tar.gz
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.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/jiffies.h b/include/linux/jiffies.h
index 1a9cf78bf..6811f4b 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
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