tools/vm/page-types.c: cleanups

Compiling page-type.c with a recent compiler produces many warnings,
mostly related to signed/unsigned comparisons.  This patch cleans up most
of them.

One remaining warning is about an unused parameter.  The <compiler.h> file
doesn't define a __unused macro (or the like) yet.  This can be addressed
later.

Signed-off-by: Ulrich Drepper <drepper@gmail.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

tools/vm/page-types.c

@@ -300,7 +300,7 @@ static char *page_flag_name(uint64_t flags)
 {
 	static char buf[65];
 	int present;
-	int i, j;
+	size_t i, j;
 
 	for (i = 0, j = 0; i < ARRAY_SIZE(page_flag_names); i++) {
 		present = (flags >> i) & 1;
@@ -318,7 +318,7 @@ static char *page_flag_name(uint64_t flags)
 static char *page_flag_longname(uint64_t flags)
 {
 	static char buf[1024];
-	int i, n;
+	size_t i, n;
 
 	for (i = 0, n = 0; i < ARRAY_SIZE(page_flag_names); i++) {
 		if (!page_flag_names[i])
@@ -376,7 +376,7 @@ static void show_page(unsigned long voffset,
 
 static void show_summary(void)
 {
-	int i;
+	size_t i;
 
 	printf("             flags\tpage-count       MB"
 		"  symbolic-flags\t\t\tlong-symbolic-flags\n");
@@ -474,7 +474,7 @@ static int debugfs_valid_mountpoint(const char *debugfs)
 /* find the path to the mounted debugfs */
 static const char *debugfs_find_mountpoint(void)
 {
-	const char **ptr;
+	const char *const *ptr;
 	char type[100];
 	FILE *fp;
 
@@ -511,7 +511,7 @@ static const char *debugfs_find_mountpoint(void)
 
 static void debugfs_mount(void)
 {
-	const char **ptr;
+	const char *const *ptr;
 
 	/* see if it's already mounted */
 	if (debugfs_find_mountpoint())
@@ -588,10 +588,10 @@ static int unpoison_page(unsigned long offset)
  * page frame walker
  */
 
-static int hash_slot(uint64_t flags)
+static size_t hash_slot(uint64_t flags)
 {
-	int k = HASH_KEY(flags);
-	int i;
+	size_t k = HASH_KEY(flags);
+	size_t i;
 
 	/* Explicitly reserve slot 0 for flags 0: the following logic
 	 * cannot distinguish an unoccupied slot from slot (flags==0).
@@ -644,7 +644,7 @@ static void walk_pfn(unsigned long voffset,
 {
 	uint64_t buf[KPAGEFLAGS_BATCH];
 	unsigned long batch;
-	long pages;
+	unsigned long pages;
 	unsigned long i;
 
 	while (count) {
@@ -753,7 +753,7 @@ static const char *page_flag_type(uint64_t flag)
 
 static void usage(void)
 {
-	int i, j;
+	size_t i, j;
 
 	printf(
 "page-types [options]\n"
@@ -912,7 +912,7 @@ static void add_bits_filter(uint64_t mask, uint64_t bits)
 
 static uint64_t parse_flag_name(const char *str, int len)
 {
-	int i;
+	size_t i;
 
 	if (!*str || !len)
 		return 0;