lib, arch: add filter argument to show_mem and fix private implementations

Commit ddd588b5dd55 ("oom: suppress nodes that are not allowed from
meminfo on oom kill") moved lib/show_mem.o out of lib/lib.a, which
resulted in build warnings on all architectures that implement their own
versions of show_mem():

	lib/lib.a(show_mem.o): In function `show_mem':
	show_mem.c:(.text+0x1f4): multiple definition of `show_mem'
	arch/sparc/mm/built-in.o:(.text+0xd70): first defined here

The fix is to remove __show_mem() and add its argument to show_mem() in
all implementations to prevent this breakage.

Architectures that implement their own show_mem() actually don't do
anything with the argument yet, but they could be made to filter nodes
that aren't allowed in the current context in the future just like the
generic implementation.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Reported-by: James Bottomley <James.Bottomley@hansenpartnership.com>
Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

14 files changed, 15 insertions, 21 deletions

diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index b3b0f0f5053..e5f6fc42834 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -78,7 +78,7 @@ __tagtable(ATAG_INITRD2, parse_tag_initrd2);
  */
 struct meminfo meminfo;
 
-void show_mem(void)
+void show_mem(unsigned int filter)
 {
 	int free = 0, total = 0, reserved = 0;
 	int shared = 0, cached = 0, slab = 0, i;
diff --git a/arch/ia64/mm/contig.c b/arch/ia64/mm/contig.c
index 54bf5405981..9a018cde5d8 100644
--- a/arch/ia64/mm/contig.c
+++ b/arch/ia64/mm/contig.c
@@ -36,7 +36,7 @@ static unsigned long max_gap;
  * Shows a simple page count of reserved and used pages in the system.
  * For discontig machines, it does this on a per-pgdat basis.
  */
-void show_mem(void)
+void show_mem(unsigned int filter)
 {
 	int i, total_reserved = 0;
 	int total_shared = 0, total_cached = 0;
diff --git a/arch/ia64/mm/discontig.c b/arch/ia64/mm/discontig.c
index 61620323bb6..82ab1bc6afb 100644
--- a/arch/ia64/mm/discontig.c
+++ b/arch/ia64/mm/discontig.c
@@ -614,7 +614,7 @@ void __cpuinit *per_cpu_init(void)
  * Shows a simple page count of reserved and used pages in the system.
  * For discontig machines, it does this on a per-pgdat basis.
  */
-void show_mem(void)
+void show_mem(unsigned int filter)
 {
 	int i, total_reserved = 0;
 	int total_shared = 0, total_cached = 0;
diff --git a/arch/parisc/mm/init.c b/arch/parisc/mm/init.c
index f4f4d700833..b7ed8d7a9b3 100644
--- a/arch/parisc/mm/init.c
+++ b/arch/parisc/mm/init.c
@@ -544,7 +544,7 @@ void __init mem_init(void)
 unsigned long *empty_zero_page __read_mostly;
 EXPORT_SYMBOL(empty_zero_page);
 
-void show_mem(void)
+void show_mem(unsigned int filter)
 {
 	int i,free = 0,total = 0,reserved = 0;
 	int shared = 0, cached = 0;
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index d17d04cfb2c..33794c1d92c 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -821,7 +821,7 @@ cmds(struct pt_regs *excp)
 				memzcan();
 				break;
 			case 'i':
-				show_mem();
+				show_mem(0);
 				break;
 			default:
 				termch = cmd;
diff --git a/arch/sparc/mm/init_32.c b/arch/sparc/mm/init_32.c
index 6d0e02c4fe0..4c31e2b6e71 100644
--- a/arch/sparc/mm/init_32.c
+++ b/arch/sparc/mm/init_32.c
@@ -75,7 +75,7 @@ void __init kmap_init(void)
 	kmap_prot = __pgprot(SRMMU_ET_PTE | SRMMU_PRIV | SRMMU_CACHE);
 }
 
-void show_mem(void)
+void show_mem(unsigned int filter)
 {
 	printk("Mem-info:\n");
 	show_free_areas();
diff --git a/arch/tile/mm/pgtable.c b/arch/tile/mm/pgtable.c
index 1a2b36f8866..de7d8e21e01 100644
--- a/arch/tile/mm/pgtable.c
+++ b/arch/tile/mm/pgtable.c
@@ -41,7 +41,7 @@
  * The normal show_free_areas() is too verbose on Tile, with dozens
  * of processors and often four NUMA zones each with high and lowmem.
  */
-void show_mem(void)
+void show_mem(unsigned int filter)
 {
 	struct zone *zone;
 
diff --git a/arch/unicore32/mm/init.c b/arch/unicore32/mm/init.c
index 3dbe3709b69..1fc02633f70 100644
--- a/arch/unicore32/mm/init.c
+++ b/arch/unicore32/mm/init.c
@@ -55,7 +55,7 @@ early_param("initrd", early_initrd);
  */
 struct meminfo meminfo;
 
-void show_mem(void)
+void show_mem(unsigned int filter)
 {
 	int free = 0, total = 0, reserved = 0;
 	int shared = 0, cached = 0, slab = 0, i;
diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c
index 81f13958e75..43db715f150 100644
--- a/drivers/tty/sysrq.c
+++ b/drivers/tty/sysrq.c
@@ -306,7 +306,7 @@ static struct sysrq_key_op sysrq_ftrace_dump_op = {
 
 static void sysrq_handle_showmem(int key)
 {
-	show_mem();
+	show_mem(0);
 }
 static struct sysrq_key_op sysrq_showmem_op = {
 	.handler	= sysrq_handle_showmem,
diff --git a/drivers/tty/vt/keyboard.c b/drivers/tty/vt/keyboard.c
index 6dd3c68c13a..d6b342b5b42 100644
--- a/drivers/tty/vt/keyboard.c
+++ b/drivers/tty/vt/keyboard.c
@@ -600,7 +600,7 @@ static void fn_scroll_back(struct vc_data *vc)
 
 static void fn_show_mem(struct vc_data *vc)
 {
-	show_mem();
+	show_mem(0);
 }
 
 static void fn_show_state(struct vc_data *vc)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index f9535b2c955..7606d7db96c 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -861,7 +861,7 @@ extern void pagefault_out_of_memory(void);
 #define offset_in_page(p)	((unsigned long)(p) & ~PAGE_MASK)
 
 /*
- * Flags passed to __show_mem() and __show_free_areas() to suppress output in
+ * Flags passed to show_mem() and __show_free_areas() to suppress output in
  * various contexts.
  */
 #define SHOW_MEM_FILTER_NODES	(0x0001u)	/* filter disallowed nodes */
@@ -1360,8 +1360,7 @@ extern void setup_per_zone_wmarks(void);
 extern void calculate_zone_inactive_ratio(struct zone *zone);
 extern void mem_init(void);
 extern void __init mmap_init(void);
-extern void show_mem(void);
-extern void __show_mem(unsigned int flags);
+extern void show_mem(unsigned int flags);
 extern void si_meminfo(struct sysinfo * val);
 extern void si_meminfo_node(struct sysinfo *val, int nid);
 extern int after_bootmem;
diff --git a/lib/show_mem.c b/lib/show_mem.c
index d8d602b58c3..90cbe4bb596 100644
--- a/lib/show_mem.c
+++ b/lib/show_mem.c
@@ -9,7 +9,7 @@
 #include <linux/nmi.h>
 #include <linux/quicklist.h>
 
-void __show_mem(unsigned int filter)
+void show_mem(unsigned int filter)
 {
 	pg_data_t *pgdat;
 	unsigned long total = 0, reserved = 0, shared = 0,
@@ -61,8 +61,3 @@ void __show_mem(unsigned int filter)
 		quicklist_total_size());
 #endif
 }
-
-void show_mem(void)
-{
-	__show_mem(0);
-}
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 62a5cec08a1..6a819d1b2c7 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -406,7 +406,7 @@ static void dump_header(struct task_struct *p, gfp_t gfp_mask, int order,
 	task_unlock(current);
 	dump_stack();
 	mem_cgroup_print_oom_info(mem, p);
-	__show_mem(SHOW_MEM_FILTER_NODES);
+	show_mem(SHOW_MEM_FILTER_NODES);
 	if (sysctl_oom_dump_tasks)
 		dump_tasks(mem, nodemask);
 }
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 8e5726ab0d8..d6e7ba7373b 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2195,7 +2195,7 @@ nopage:
 			current->comm, order, gfp_mask);
 		dump_stack();
 		if (!should_suppress_show_mem())
-			__show_mem(filter);
+			show_mem(filter);
 	}
 	return page;
 got_pg: