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