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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>
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@ -615,19 +615,13 @@ static void cputime_adjust(struct task_cputime *curr,
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* userspace. Once a task gets some ticks, the monotonicy code at
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* 'update' will ensure things converge to the observed ratio.
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*/
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if (stime == 0) {
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utime = rtime;
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goto update;
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if (stime != 0) {
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if (utime == 0)
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stime = rtime;
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else
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stime = scale_stime(stime, rtime, stime + utime);
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}
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if (utime == 0) {
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stime = rtime;
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goto update;
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}
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stime = scale_stime(stime, rtime, stime + utime);
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update:
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/*
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* Make sure stime doesn't go backwards; this preserves monotonicity
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* for utime because rtime is monotonic.
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