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| author | Thomas Gleixner <tglx@linutronix.de> | 2019-08-21 21:09:19 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2019-08-28 11:50:40 +0200 |
| commit | 2bbdbdae05167c688b6d3499a7dab74208b80a22 (patch) | |
| tree | 7731020cb6763b1c4fd314b39acff07855b2a894 /kernel/sys.c | |
| parent | 24db4dd90dd53ad6e3331b6f01cb985e466cface (diff) | |
| download | linux-2bbdbdae05167c688b6d3499a7dab74208b80a22.tar.gz linux-2bbdbdae05167c688b6d3499a7dab74208b80a22.tar.bz2 linux-2bbdbdae05167c688b6d3499a7dab74208b80a22.zip | |
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 'kernel/sys.c')
| -rw-r--r-- | kernel/sys.c | 9 |
1 files changed, 0 insertions, 9 deletions
diff --git a/kernel/sys.c b/kernel/sys.c index c578b75d7923..2462aa84247f 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -1557,15 +1557,6 @@ int do_prlimit(struct task_struct *tsk, unsigned int resource, retval = -EPERM; if (!retval) retval = security_task_setrlimit(tsk, resource, new_rlim); - if (resource == RLIMIT_CPU && new_rlim->rlim_cur == 0) { - /* - * The caller is asking for an immediate RLIMIT_CPU - * expiry. But we use the zero value to mean "it was - * never set". So let's cheat and make it one second - * instead - */ - new_rlim->rlim_cur = 1; - } } if (!retval) { if (old_rlim) |