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

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 <sergey.senozhatsky@gmail.com>
Reported-by: Peter Zijlstra <peterz@infradead.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Amir Vadai <amirv@mellanox.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrew Morton 2015-06-18 11:01:11 -07:00 committed by Linus Torvalds
parent 17fda38f15
commit 5ca62d6503
1 changed files with 4 additions and 5 deletions
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9
lib/cpumask.c
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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);