path: root/lib/cpumask.c
diff options
authorSergey Senozhatsky <sergey.senozhatsky@gmail.com>2015-04-16 12:48:04 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-04-17 09:04:08 -0400
commit534b483a86e6b96f1b5cc03bbe4b696f3daead6d (patch)
treeec18ce40af0aa37b9f4144a4f77de335d54f7c25 /lib/cpumask.c
parentdfcce791fb0ad06f3f0b745a23160b9d8858fe39 (diff)
cpumask: don't perform while loop in cpumask_next_and()
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>
Diffstat (limited to 'lib/cpumask.c')
1 files changed, 5 insertions, 4 deletions
diff --git a/lib/cpumask.c b/lib/cpumask.c
index b6513a9f2892..5ab1553fd076 100644
--- a/lib/cpumask.c
+++ b/lib/cpumask.c
@@ -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;

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