[PATCH] change alloc function in pcpu_alloc_pages

[Minchan Kim]

alloc_pages_node is called with cpu_to_node(cpu).
I think cpu_to_node(cpu) never returns -1.
(But I am not sure we need double check.)

So we can use alloc_pages_exact_node instead of alloc_pages_node.
It could avoid comparison and branch as 6484eb3e2a81807722 tried.

Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Minchan Kim <minchan.kim@xxxxxxxxx>
---
 mm/percpu.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/mm/percpu.c b/mm/percpu.c
index 768419d..ec3e671 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -720,7 +720,7 @@ static int pcpu_alloc_pages(struct pcpu_chunk *chunk,
 		for (i = page_start; i < page_end; i++) {
 			struct page **pagep = &pages[pcpu_page_idx(cpu, i)];
 
-			*pagep = alloc_pages_node(cpu_to_node(cpu), gfp, 0);
+			*pagep = alloc_pages_exact_node(cpu_to_node(cpu), gfp, 0);
 			if (!*pagep) {
 				pcpu_free_pages(chunk, pages, populated,
 						page_start, page_end);
-- 
1.7.0.5

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