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percpu: renew the max_contig if we merge the head and previous block 

During pcpu_alloc_area(), we might merge the current head with the
previous block. Since we have calculated the max_contig using the
size of previous block before we skip it, and now we update the size
of previous block, so we should renew the max_contig.

Signed-off-by: Jianyu Zhan <nasa4836@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Jianyu Zhan 2014-03-28 20:55:21 +08:00 committed by Tejun Heo
parent 2f69fa829c
commit 21ddfd38ee
1 changed files with 3 additions and 1 deletions
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4
mm/percpu.c
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@ -473,9 +473,11 @@ static int pcpu_alloc_area(struct pcpu_chunk *chunk, int size, int align)
* uncommon for percpu allocations.
*/
if (head && (head < sizeof(int) || !(p[-1] & 1))) {
*p = off += head;
if (p[-1] & 1)
chunk->free_size -= head;
*p = off += head;
else
max_contig = max(*p - p[-1], max_contig);
this_size -= head;
head = 0;
}