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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 <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:
Sergey Senozhatsky 2015-04-16 12:48:04 -07:00 committed by Linus Torvalds
parent dfcce791fb
commit 534b483a86
1 changed files with 5 additions and 4 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

9
lib/cpumask.c
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@ -37,10 +37,11 @@ EXPORT_SYMBOL(__next_cpu_nr);
int cpumask_next_and(int n, const struct cpumask *src1p, int cpumask_next_and(int n, const struct cpumask *src1p,
const struct cpumask *src2p) const struct cpumask *src2p)
{ {
while ((n = cpumask_next(n, src1p)) < nr_cpu_ids) struct cpumask tmp;
if (cpumask_test_cpu(n, src2p))
break; if (cpumask_and(&tmp, src1p, src2p))
return n; return cpumask_next(n, &tmp);
return nr_cpu_ids;
} }
EXPORT_SYMBOL(cpumask_next_and); EXPORT_SYMBOL(cpumask_next_and);