linux-kernel - [PATCH] memory-hotplug: remove redundant call of page_to

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Date:	Tue, 11 Nov 2014 17:13:39 +0800
From:	Zhang Zhen <zhenzhang.zhang@...wei.com>
To:	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Hansen <dave.hansen@...el.com>,
	Linux MM <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
CC:	<wangnan0@...wei.com>
Subject: [PATCH] memory-hotplug: remove redundant call of page_to_pfn

The start_pfn can be obtained directly by
phys_index << PFN_SECTION_SHIFT.

Signed-off-by: Zhang Zhen <zhenzhang.zhang@...wei.com>
---
 drivers/base/memory.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index 7c5d871..85be040 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -228,8 +228,8 @@ memory_block_action(unsigned long phys_index, unsigned long action, int online_t
 	struct page *first_page;
 	int ret;

-	first_page = pfn_to_page(phys_index << PFN_SECTION_SHIFT);
-	start_pfn = page_to_pfn(first_page);
+	start_pfn = phys_index << PFN_SECTION_SHIFT;
+	first_page = pfn_to_page(start_pfn);

 	switch (action) {
 		case MEM_ONLINE:
-- 
1.8.1.4


.




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