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

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cpumask_next_and() is looking for cpumask_next() in src1 in a loop and
tests if found cpu is also present in src2. remove that loop, perform
cpumask_and() of src1 and src2 first and use that new mask to find
cpumask_next().

Apart from removing while loop, ./bloat-o-meter on x86_64 shows
add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-8 (-8)
function                                     old     new   delta
cpumask_next_and                              62      54      -8

Signed-off-by: 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:
Sergey Senozhatsky authored and Linus Torvalds committed 2015-04-17 09:04:08 -04:00
1 parent dfcce791fb
commit 534b483a86
1 file changed
+5 -4
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lib/cpumask.c
+5 -4
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@@ -37,10 +37,11 @@ EXPORT_SYMBOL(__next_cpu_nr);
int cpumask_next_and(int n, const struct cpumask *src1p,
const struct cpumask *src2p)
{
while ((n = cpumask_next(n, src1p)) < nr_cpu_ids)
if (cpumask_test_cpu(n, src2p))
break;
return n;
struct cpumask tmp;
if (cpumask_and(&tmp, src1p, src2p))
return cpumask_next(n, &tmp);
return nr_cpu_ids;
}
EXPORT_SYMBOL(cpumask_next_and);