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memory-hotplug: remove redundant call of page_to_pfn

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This is just a small optimization.  The start_pfn can be obtained directly
by phys_index << PFN_SECTION_SHIFT.  So the call of page_to_pfn() is
redundant and remove it.

Signed-off-by: Zhang Zhen <zhenzhang.zhang@huawei.com>
Acked-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Dave Hansen <dave@sr71.net>
Cc: Wang Nan <wangnan0@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Zhang Zhen 2014-12-12 16:55:33 -08:00 committed by Linus Torvalds
parent 9dc00f4c4f
commit 71fbd556ad
1 changed files with 2 additions and 2 deletions
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4
drivers/base/memory.c
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@ -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: