[PATCH] remove set_page_count() outside mm/

set_page_count usage outside mm/ is limited to setting the refcount to 1.
Remove set_page_count from outside mm/, and replace those users with
init_page_count() and set_page_refcounted().

This allows more debug checking, and tighter control on how code is allowed
to play around with page->_count.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

4 files changed, 7 insertions, 7 deletions

diff --git a/arch/powerpc/mm/init_32.c b/arch/powerpc/mm/init_32.c
index 7d0d75c11848..b57fb3a2b7bb 100644
--- a/arch/powerpc/mm/init_32.c
+++ b/arch/powerpc/mm/init_32.c
@@ -216,7 +216,7 @@ static void free_sec(unsigned long start, unsigned long end, const char *name)
 
         while (start < end) {
                 ClearPageReserved(virt_to_page(start));
-                set_page_count(virt_to_page(start), 1);
+                init_page_count(virt_to_page(start));
                 free_page(start);
                 cnt++;
                 start += PAGE_SIZE;
@@ -248,7 +248,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
                 printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
         for (; start < end; start += PAGE_SIZE) {
                 ClearPageReserved(virt_to_page(start));
-                set_page_count(virt_to_page(start), 1);
+                init_page_count(virt_to_page(start));
                 free_page(start);
                 totalram_pages++;
         }
diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c
index 81cfb0c2ec58..bacb71c89811 100644
--- a/arch/powerpc/mm/init_64.c
+++ b/arch/powerpc/mm/init_64.c
@@ -140,7 +140,7 @@ void free_initmem(void)
         for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) {
                 memset((void *)addr, 0xcc, PAGE_SIZE);
                 ClearPageReserved(virt_to_page(addr));
-                set_page_count(virt_to_page(addr), 1);
+                init_page_count(virt_to_page(addr));
                 free_page(addr);
                 totalram_pages++;
         }
@@ -155,7 +155,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
                 printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
         for (; start < end; start += PAGE_SIZE) {
                 ClearPageReserved(virt_to_page(start));
-                set_page_count(virt_to_page(start), 1);
+                init_page_count(virt_to_page(start));
                 free_page(start);
                 totalram_pages++;
         }
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 6ae5c130d0db..454cac01d8cc 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -108,7 +108,7 @@ EXPORT_SYMBOL(phys_mem_access_prot);
 void online_page(struct page *page)
 {
         ClearPageReserved(page);
-        set_page_count(page, 1);
+        init_page_count(page);
         __free_page(page);
         totalram_pages++;
         num_physpages++;
@@ -376,7 +376,7 @@ void __init mem_init(void)
                         struct page *page = pfn_to_page(pfn);
 
                         ClearPageReserved(page);
-                        set_page_count(page, 1);
+                        init_page_count(page);
                         __free_page(page);
                         totalhigh_pages++;
                 }
diff --git a/arch/powerpc/platforms/cell/setup.c b/arch/powerpc/platforms/cell/setup.c
index b33a4443f5a9..fec8e65b36ea 100644
--- a/arch/powerpc/platforms/cell/setup.c
+++ b/arch/powerpc/platforms/cell/setup.c
@@ -115,7 +115,7 @@ static void __init cell_spuprop_present(struct device_node *spe,
                 for (pfn = start_pfn; pfn < end_pfn; pfn++) {
                         struct page *page = pfn_to_page(pfn);
                         set_page_links(page, ZONE_DMA, node_id, pfn);
-                        set_page_count(page, 1);
+                        init_page_count(page);
                         reset_page_mapcount(page);
                         SetPageReserved(page);
                         INIT_LIST_HEAD(&page->lru);