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| author | Frederic Weisbecker <fweisbec@gmail.com> | 2017-01-31 04:09:17 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-02-01 09:13:45 +0100 |
| commit | 07e5f5e353aaa61696c8353d87050994a0c4648a (patch) | |
| tree | 6a4dc46f3e3f6f9e347ce98054174504d3d789e1 /kernel/time/time.c | |
| parent | jiffies: Reuse TICK_NSEC instead of NSEC_PER_JIFFY (diff) | |
| download | linux-07e5f5e353aaa61696c8353d87050994a0c4648a.tar.xz linux-07e5f5e353aaa61696c8353d87050994a0c4648a.zip | |
time: Introduce jiffies64_to_nsecs()
This will be needed for the cputime_t to nsec conversion.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: Wanpeng Li <wanpeng.li@hotmail.com>
Link: http://lkml.kernel.org/r/1485832191-26889-2-git-send-email-fweisbec@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/time/time.c')
| -rw-r--r-- | kernel/time/time.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/time/time.c b/kernel/time/time.c index a3a9a8a029dc..25bdd2504571 100644 --- a/kernel/time/time.c +++ b/kernel/time/time.c @@ -702,6 +702,16 @@ u64 nsec_to_clock_t(u64 x) #endif } +u64 jiffies64_to_nsecs(u64 j) +{ +#if !(NSEC_PER_SEC % HZ) + return (NSEC_PER_SEC / HZ) * j; +# else + return div_u64(j * HZ_TO_NSEC_NUM, HZ_TO_NSEC_DEN); +#endif +} +EXPORT_SYMBOL(jiffies64_to_nsecs); + /** * nsecs_to_jiffies64 - Convert nsecs in u64 to jiffies64 * |