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authorGustavo A. R. Silva <garsilva@embeddedor.com>2017-06-29 21:41:28 +0300
committerIngo Molnar <mingo@kernel.org>2017-06-30 10:37:59 +0300
commit72298e5c92c50edd8cb7cfda4519483ce65fa166 (patch)
treecd927a0333b4b8c66ec619acdfcee4525ff46ff5 /kernel/sched
parent48365b38849fdb1ee6dc65beac044ca59f669683 (diff)
downloadlinux-72298e5c92c50edd8cb7cfda4519483ce65fa166.tar.xz
sched/cputime: Refactor the cputime_adjust() code
Address a Coverity false positive, which is caused by overly convoluted code: Value assigned to variable 'utime' at line 619:utime = rtime; is overwritten at line 642:utime = rtime - stime; before it can be used. This makes such variable assignment useless. Remove this variable assignment and refactor the code related. Addresses-Coverity-ID: 1371643 Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com> Cc: Frans Klaver <fransklaver@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Stanislaw Gruszka <sgruszka@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Wanpeng Li <wanpeng.li@hotmail.com> Link: http://lkml.kernel.org/r/20170629184128.GA5271@embeddedgus Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched')
-rw-r--r--kernel/sched/cputime.c16
1 files changed, 5 insertions, 11 deletions
diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
index aea3135c5d90..67c70e287647 100644
--- a/kernel/sched/cputime.c
+++ b/kernel/sched/cputime.c
@@ -615,19 +615,13 @@ static void cputime_adjust(struct task_cputime *curr,
* userspace. Once a task gets some ticks, the monotonicy code at
* 'update' will ensure things converge to the observed ratio.
*/
- if (stime == 0) {
- utime = rtime;
- goto update;
+ if (stime != 0) {
+ if (utime == 0)
+ stime = rtime;
+ else
+ stime = scale_stime(stime, rtime, stime + utime);
}
- if (utime == 0) {
- stime = rtime;
- goto update;
- }
-
- stime = scale_stime(stime, rtime, stime + utime);
-
-update:
/*
* Make sure stime doesn't go backwards; this preserves monotonicity
* for utime because rtime is monotonic.