[PATCH] mm/sparse: remove duplicated pfn_to_section_nr()

[qiwuchen55@gmail.com]

From: chenqiwu <chenqiwu@xiaomi.com>

Remove duplicated pfn_to_section_nr() in pfn_valid() and pfn_present()
to increase executing efficiency of code.

Signed-off-by: chenqiwu <chenqiwu@xiaomi.com>
---
 include/linux/mmzone.h | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 462f687..c2b7868 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -1358,10 +1358,11 @@ static inline int pfn_section_valid(struct mem_section *ms, unsigned long pfn)
 static inline int pfn_valid(unsigned long pfn)
 {
 	struct mem_section *ms;
+	unsigned long sec_nr = pfn_to_section_nr(pfn);
 
-	if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS)
+	if (pfn >= NR_MEM_SECTIONS)
 		return 0;
-	ms = __nr_to_section(pfn_to_section_nr(pfn));
+	ms = __nr_to_section(sec_nr);
 	if (!valid_section(ms))
 		return 0;
 	/*
@@ -1374,9 +1375,11 @@ static inline int pfn_valid(unsigned long pfn)
 
 static inline int pfn_present(unsigned long pfn)
 {
-	if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS)
+	unsigned long sec_nr = pfn_to_section_nr(pfn);
+
+	if (sec_nr >= NR_MEM_SECTIONS)
 		return 0;
-	return present_section(__nr_to_section(pfn_to_section_nr(pfn)));
+	return present_section(__nr_to_section(sec_nr));
 }
 
 static inline unsigned long next_present_section_nr(unsigned long section_nr)
-- 
1.9.1