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| author | Sergey Senozhatsky <sergey.senozhatsky@gmail.com> | 2015-04-16 12:48:04 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-04-17 09:04:08 -0400 |
| commit | 534b483a86e6b96f1b5cc03bbe4b696f3daead6d (patch) | |
| tree | ec18ce40af0aa37b9f4144a4f77de335d54f7c25 /lib/cpumask.c | |
| parent | dfcce791fb0ad06f3f0b745a23160b9d8858fe39 (diff) | |
| download | lwn-534b483a86e6b96f1b5cc03bbe4b696f3daead6d.tar.gz lwn-534b483a86e6b96f1b5cc03bbe4b696f3daead6d.zip | |
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')
| -rw-r--r-- | lib/cpumask.c | 9 |
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; } EXPORT_SYMBOL(cpumask_next_and); |