From: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Subject: mm, page_alloc: simplify last cpupid reset
The current reset unnecessarily clears flags and makes pointless calculations.
Signed-off-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mm.h | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff -puN include/linux/mm.h~mm-page_alloc-simplify-last-cpupid-reset include/linux/mm.h
--- a/include/linux/mm.h~mm-page_alloc-simplify-last-cpupid-reset
+++ a/include/linux/mm.h
@@ -850,10 +850,7 @@ extern int page_cpupid_xchg_last(struct
static inline void page_cpupid_reset_last(struct page *page)
{
- int cpupid = (1 << LAST_CPUPID_SHIFT) - 1;
-
- page->flags &= ~(LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT);
- page->flags |= (cpupid & LAST_CPUPID_MASK) << LAST_CPUPID_PGSHIFT;
+ page->flags |= LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT;
}
#endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */
#else /* !CONFIG_NUMA_BALANCING */
_
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