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revert "cpumask: don't perform while loop in cpumask_next_and()"

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Revert commit 534b483a86 ("cpumask: don't perform while loop in
cpumask_next_and()").

This was a minor optimization, but it puts a `struct cpumask' on the
stack, which consumes too much stack space.

Sergey Senozhatsky <[email protected]>
Reported-by: Peter Zijlstra <[email protected]>
Cc: Sergey Senozhatsky <[email protected]>
Cc: Tejun Heo <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Amir Vadai <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Andrew Morton authored and Linus Torvalds committed 2015-06-18 17:00:23 -10:00
1 parent 17fda38f15
commit 5ca62d6503
1 file changed
+4 -5
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lib/cpumask.c
+4 -5
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@@ -16,11 +16,10 @@
int cpumask_next_and(int n, const struct cpumask *src1p,
const struct cpumask *src2p)
{
struct cpumask tmp;
if (cpumask_and(&tmp, src1p, src2p))
return cpumask_next(n, &tmp);
return nr_cpu_ids;
while ((n = cpumask_next(n, src1p)) < nr_cpu_ids)
if (cpumask_test_cpu(n, src2p))
break;
return n;
}
EXPORT_SYMBOL(cpumask_next_and);