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authorThomas Gleixner <tglx@linutronix.de>2019-08-21 22:09:19 +0300
committerThomas Gleixner <tglx@linutronix.de>2019-08-28 12:50:40 +0300
commit2bbdbdae05167c688b6d3499a7dab74208b80a22 (patch)
tree7731020cb6763b1c4fd314b39acff07855b2a894 /include/linux/posix-timers.h
parent24db4dd90dd53ad6e3331b6f01cb985e466cface (diff)
downloadlinux-2bbdbdae05167c688b6d3499a7dab74208b80a22.tar.xz
posix-cpu-timers: Get rid of zero checks
Deactivation of the expiry cache is done by setting all clock caches to 0. That requires to have a check for zero in all places which update the expiry cache: if (cache == 0 || new < cache) cache = new; Use U64_MAX as the deactivated value, which allows to remove the zero checks when updating the cache and reduces it to the obvious check: if (new < cache) cache = new; This also removes the weird workaround in do_prlimit() which was required to convert a RLIMIT_CPU value of 0 (immediate expiry) to 1 because handing in 0 to the posix CPU timer code would have effectively disarmed it. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Frederic Weisbecker <frederic@kernel.org> Link: https://lkml.kernel.org/r/20190821192922.275086128@linutronix.de
Diffstat (limited to 'include/linux/posix-timers.h')
-rw-r--r--include/linux/posix-timers.h7
1 files changed, 5 insertions, 2 deletions
diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h
index 64bd10d251fe..3ea920e8fe7f 100644
--- a/include/linux/posix-timers.h
+++ b/include/linux/posix-timers.h
@@ -86,7 +86,9 @@ struct posix_cputimers {
static inline void posix_cputimers_init(struct posix_cputimers *pct)
{
- memset(pct->bases, 0, sizeof(pct->bases));
+ pct->bases[0].nextevt = U64_MAX;
+ pct->bases[1].nextevt = U64_MAX;
+ pct->bases[2].nextevt = U64_MAX;
INIT_LIST_HEAD(&pct->bases[0].cpu_timers);
INIT_LIST_HEAD(&pct->bases[1].cpu_timers);
INIT_LIST_HEAD(&pct->bases[2].cpu_timers);
@@ -102,7 +104,8 @@ static inline void posix_cputimers_rt_watchdog(struct posix_cputimers *pct,
/* Init task static initializer */
#define INIT_CPU_TIMERBASE(b) { \
- .cpu_timers = LIST_HEAD_INIT(b.cpu_timers), \
+ .nextevt = U64_MAX, \
+ .cpu_timers = LIST_HEAD_INIT(b.cpu_timers), \
}
#define INIT_CPU_TIMERBASES(b) { \