From: Mel Gorman <mgorman@techsingularity.net>
Date: Fri, 20 May 2016 00:13:53 +0000 (-0700)
Subject: mm, page_alloc: simplify last cpupid reset
X-Git-Tag: v4.7-rc1~110^2~18
X-Git-Url: http://git.cascardo.eti.br/?a=commitdiff_plain;h=09940a4f1e816abe3248fa0d185fc0e7f54c8c12;p=cascardo%2Flinux.git

mm, page_alloc: simplify last cpupid reset

The current reset unnecessarily clears flags and makes pointless
calculations.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 9c2852cabf01..2b97be1147ec 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -850,10 +850,7 @@ extern int page_cpupid_xchg_last(struct page *page, int cpupid);
 
 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 */