diff options
| author | Mikulas Patocka <mpatocka@redhat.com> | 2014-01-24 16:41:36 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-02-22 13:34:59 -0800 |
| commit | 54c028419db7716c0a2bff9cbf438067609db6e5 (patch) | |
| tree | fdc73b17e174ecda15f61c3c7993f7dc092cb285 | |
| parent | 160e9e9caed114b965d29231c93b96452479e599 (diff) | |
| download | lwn-54c028419db7716c0a2bff9cbf438067609db6e5.tar.gz lwn-54c028419db7716c0a2bff9cbf438067609db6e5.zip | |
time: Fix overflow when HZ is smaller than 60
commit 80d767d770fd9c697e434fd080c2db7b5c60c6dd upstream.
When compiling for the IA-64 ski emulator, HZ is set to 32 because the
emulation is slow and we don't want to waste too many cycles processing
timers. Alpha also has an option to set HZ to 32.
This causes integer underflow in
kernel/time/jiffies.c:
kernel/time/jiffies.c:66:2: warning: large integer implicitly truncated to unsigned type [-Woverflow]
.mult = NSEC_PER_JIFFY << JIFFIES_SHIFT, /* details above */
^
This patch reduces the JIFFIES_SHIFT value to avoid the overflow.
Signed-off-by: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>
Link: http://lkml.kernel.org/r/alpine.LRH.2.02.1401241639100.23871@file01.intranet.prod.int.rdu2.redhat.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | kernel/time/jiffies.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/time/jiffies.c b/kernel/time/jiffies.c index 7a925ba456fb..a6a5bf53e86d 100644 --- a/kernel/time/jiffies.c +++ b/kernel/time/jiffies.c @@ -51,7 +51,13 @@ * HZ shrinks, so values greater than 8 overflow 32bits when * HZ=100. */ +#if HZ < 34 +#define JIFFIES_SHIFT 6 +#elif HZ < 67 +#define JIFFIES_SHIFT 7 +#else #define JIFFIES_SHIFT 8 +#endif static cycle_t jiffies_read(struct clocksource *cs) { |