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percpu: move common parts out of pcpu_[de]populate_chunk()

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percpu-vm and percpu-km implement separate versions of
pcpu_[de]populate_chunk() and some part which is or should be common
are currently in the specific implementations.  Make the following
changes.

* Allocate area clearing is moved from the pcpu_populate_chunk()
  implementations to pcpu_alloc().  This makes percpu-km's version
  noop.

* Quick exit tests in pcpu_[de]populate_chunk() of percpu-vm are moved
  to their respective callers so that they are applied to percpu-km
  too.  This doesn't make any meaningful difference as both functions
  are noop for percpu-km; however, this is more consistent and will
  help implementing atomic allocation support.

Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo 2014-09-02 14:46:01 -04:00
parent cdb4cba5a3
commit dca496451b
3 changed files with 31 additions and 40 deletions
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5
mm/percpu-km.c
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@ -35,11 +35,6 @@
static int pcpu_populate_chunk(struct pcpu_chunk *chunk, int off, int size)
{
unsigned int cpu;
for_each_possible_cpu(cpu)
memset((void *)pcpu_chunk_addr(chunk, cpu, 0) + off, 0, size);
return 0;
}