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memory-hotplug: remove redundant call of page_to_pfn

PATCH New Zhang Zhen 1 participant 1 message Nov 12, 2014 1 message not in the archive

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Memory management Driver core Memory hot(un)plug
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Zhang Zhen

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PATCH v2 1/1 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.

v2:
added the purpose of the patch to the description.

Signed-off-by Zhang Zhen <[email protected]>
Acked-by Yasuaki Ishimatsu <[email protected]>
---
 drivers/base/memory.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
drivers/base/memory.c +2 -2
index 7c5d871..85be040 100644
@@ -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:
Signature · 13 lines
1.8.1.4


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