proc: kpagecount/kpageflags code cleanup

Move increments of pfn/out to bottom of the loop.

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Andi Kleen <andi@firstfloor.org>
Acked-by: Matt Mackall <mpm@selenic.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/proc/page.c

@@ -12,6 +12,7 @@
 
 #define KPMSIZE sizeof(u64)
 #define KPMMASK (KPMSIZE - 1)
+
 /* /proc/kpagecount - an array exposing page counts
  *
  * Each entry is a u64 representing the corresponding
@@ -33,20 +34,22 @@ static ssize_t kpagecount_read(struct file *file, char __user *buf,
 		return -EINVAL;
 
 	while (count > 0) {
-		ppage = NULL;
 		if (pfn_valid(pfn))
 			ppage = pfn_to_page(pfn);
-		pfn++;
+		else
+			ppage = NULL;
 		if (!ppage)
 			pcount = 0;
 		else
 			pcount = page_mapcount(ppage);
 
-		if (put_user(pcount, out++)) {
+		if (put_user(pcount, out)) {
 			ret = -EFAULT;
 			break;
 		}
 
+		pfn++;
+		out++;
 		count -= KPMSIZE;
 	}
 
@@ -99,10 +102,10 @@ static ssize_t kpageflags_read(struct file *file, char __user *buf,
 		return -EINVAL;
 
 	while (count > 0) {
-		ppage = NULL;
 		if (pfn_valid(pfn))
 			ppage = pfn_to_page(pfn);
-		pfn++;
+		else
+			ppage = NULL;
 		if (!ppage)
 			kflags = 0;
 		else
@@ -120,11 +123,13 @@ static ssize_t kpageflags_read(struct file *file, char __user *buf,
 			kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
 			kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
 
-		if (put_user(uflags, out++)) {
+		if (put_user(uflags, out)) {
 			ret = -EFAULT;
 			break;
 		}
 
+		pfn++;
+		out++;
 		count -= KPMSIZE;
 	}