[PATCH] mm/sparse: rename pfn_present() as pfn_to_section_present()

[Pingfan Liu <kernelfans@gmail.com>]

After introducing mem sub section concept, pfn_present() loses its literal
meaning, and will not be necessary a truth on partial populated mem section.

Since all of the callers use it to judge an absent section, it is better to
rename pfn_present() as pfn_to_section_present().

Signed-off-by: Pingfan Liu <kernelfans@gmail.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Leonardo Bras <leonardo@linux.ibm.com>
Cc: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Cc: Nathan Lynch <nathanl@linux.ibm.com>
To: linux-mm@kvack.org
---
 arch/powerpc/platforms/pseries/hotplug-memory.c | 2 +-
 drivers/base/node.c                             | 2 +-
 include/linux/mmzone.h                          | 4 ++--
 mm/page_ext.c                                   | 2 +-
 mm/shuffle.c                                    | 2 +-
 5 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c
index a4d40a3..5088132 100644
--- a/arch/powerpc/platforms/pseries/hotplug-memory.c
+++ b/arch/powerpc/platforms/pseries/hotplug-memory.c
@@ -360,7 +360,7 @@ static bool lmb_is_removable(struct drmem_lmb *lmb)
 
 	for (i = 0; i < scns_per_block; i++) {
 		pfn = PFN_DOWN(phys_addr);
-		if (!pfn_present(pfn)) {
+		if (!pfn_to_section_present(pfn)) {
 			phys_addr += MIN_MEMORY_BLOCK_SIZE;
 			continue;
 		}
diff --git a/drivers/base/node.c b/drivers/base/node.c
index 98a31ba..6f98568 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -772,7 +772,7 @@ static int register_mem_sect_under_node(struct memory_block *mem_blk,
 		 * memory block could have several absent sections from start.
 		 * skip pfn range from absent section
 		 */
-		if (!pfn_present(pfn)) {
+		if (!pfn_to_section_present(pfn)) {
 			pfn = round_down(pfn + PAGES_PER_SECTION,
 					 PAGES_PER_SECTION) - 1;
 			continue;
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 462f687..eca2db7 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -1372,7 +1372,7 @@ static inline int pfn_valid(unsigned long pfn)
 }
 #endif
 
-static inline int pfn_present(unsigned long pfn)
+static inline int pfn_to_section_present(unsigned long pfn)
 {
 	if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS)
 		return 0;
@@ -1409,7 +1409,7 @@ void sparse_init(void);
 #else
 #define sparse_init()	do {} while (0)
 #define sparse_index_init(_sec, _nid)  do {} while (0)
-#define pfn_present pfn_valid
+#define pfn_to_section_present pfn_valid
 #define subsection_map_init(_pfn, _nr_pages) do {} while (0)
 #endif /* CONFIG_SPARSEMEM */
 
diff --git a/mm/page_ext.c b/mm/page_ext.c
index 4ade843..df0e55e 100644
--- a/mm/page_ext.c
+++ b/mm/page_ext.c
@@ -304,7 +304,7 @@ static int __meminit online_page_ext(unsigned long start_pfn,
 	}
 
 	for (pfn = start; !fail && pfn < end; pfn += PAGES_PER_SECTION) {
-		if (!pfn_present(pfn))
+		if (!pfn_to_section_present(pfn))
 			continue;
 		fail = init_section_page_ext(pfn, nid);
 	}
diff --git a/mm/shuffle.c b/mm/shuffle.c
index b3fe97f..9242cc8 100644
--- a/mm/shuffle.c
+++ b/mm/shuffle.c
@@ -72,7 +72,7 @@ static struct page * __meminit shuffle_valid_page(unsigned long pfn, int order)
 		return NULL;
 
 	/* ...is the pfn in a present section or a hole? */
-	if (!pfn_present(pfn))
+	if (!pfn_to_section_present(pfn))
 		return NULL;
 
 	/* ...is the page free and currently on a free_area list? */
-- 
2.7.5