The patch titled
Subject: memory-hotplug: remove redundant call of page_to_pfn
has been added to the -mm tree. Its filename is
memory-hotplug-remove-redundant-call-of-page_to_pfn.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/memory-hotplug-remove-redundant-call-of-page_to_pfn.patch
echo and later at
echo http://ozlabs.org/~akpm/mmotm/broken-out/memory-hotplug-remove-redundant-call-of-page_to_pfn.patch
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------------------------------------------------------
From: Zhang Zhen <zhenzhang.zhang@xxxxxxxxxx>
Subject: memory-hotplug: remove redundant call of page_to_pfn
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@xxxxxxxxxx>
Acked-by: Yasuaki Ishimatsu <isimatu.yasuaki@xxxxxxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Dave Hansen <dave@xxxxxxxx>
Cc: Wang Nan <wangnan0@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/base/memory.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff -puN drivers/base/memory.c~memory-hotplug-remove-redundant-call-of-page_to_pfn drivers/base/memory.c
--- a/drivers/base/memory.c~memory-hotplug-remove-redundant-call-of-page_to_pfn
+++ a/drivers/base/memory.c
@@ -228,8 +228,8 @@ memory_block_action(unsigned long phys_i
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:
_
Patches currently in -mm which might be from zhenzhang.zhang@xxxxxxxxxx are
memory-hotplug-remove-redundant-call-of-page_to_pfn.patch
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