path: root/lib
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authorAndrew Morton <akpm@linux-foundation.org>2015-06-18 11:01:11 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-06-18 17:00:23 -1000
commit5ca62d65030d8295f54c490d2072563545dbd9d9 (patch)
tree1066a7809df4d33cf64220a9358993d9050b4690 /lib
parent17fda38f15953c398a2a0ae427928873c5c8c47c (diff)
revert "cpumask: don't perform while loop in cpumask_next_and()"
Revert commit 534b483a86e6 ("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>
Diffstat (limited to 'lib')
1 files changed, 4 insertions, 5 deletions
diff --git a/lib/cpumask.c b/lib/cpumask.c
index 5f627084f2e9..5a70f6196f57 100644
--- a/lib/cpumask.c
+++ b/lib/cpumask.c
@@ -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;

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