[3/3] selftests/mm: mremap_test: Use sscanf to parse /proc/self/maps

Commit Message

Dev Jain March 30, 2024, 5:35 p.m. UTC

Enforce consistency across files by avoiding two separate functions to parse
/proc/self/maps, replacing them with a simple sscanf().

Signed-off-by: Dev Jain <[e-mail]>
---
 tools/testing/selftests/mm/mremap_test.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

Patch

diff --git a/tools/testing/selftests/mm/mremap_test.c b/tools/testing/selftests/mm/mremap_test.c
index 678c79d5b8ef..1b03bcfaefdf 100644
--- a/tools/testing/selftests/mm/mremap_test.c
+++ b/tools/testing/selftests/mm/mremap_test.c
@@ -148,19 +148,21 @@  static unsigned long long get_mmap_min_addr(void)
  * Using /proc/self/maps, assert that the specified address range is contained
  * within a single mapping.
  */
-static bool is_range_mapped(FILE *maps_fp, void *start, void *end)
+static bool is_range_mapped(FILE *maps_fp, unsigned long start,
+			    unsigned long end)
 {
 	char *line = NULL;
 	size_t len = 0;
 	bool success = false;
+	unsigned long first_val, second_val;
 
 	rewind(maps_fp);
 
 	while (getline(&line, &len, maps_fp) != -1) {
-		char *first = strtok(line, "- ");
-		void *first_val = (void *)strtol(first, NULL, 16);
-		char *second = strtok(NULL, "- ");
-		void *second_val = (void *) strtol(second, NULL, 16);
+		if (sscanf(line, "%lx-%lx", &first_val, &second_val) != 2) {
+			ksft_exit_fail_msg("cannot parse /proc/self/maps\n");
+			break;
+		}
 
 		if (first_val <= start && second_val >= end) {
 			success = true;
@@ -255,7 +257,8 @@  static void mremap_expand_merge(FILE *maps_fp, unsigned long page_size)
 		goto out;
 	}
 
-	success = is_range_mapped(maps_fp, start, start + 3 * page_size);
+	success = is_range_mapped(maps_fp, (unsigned long)start,
+				  (unsigned long)(start + 3 * page_size));
 	munmap(start, 3 * page_size);
 
 out:
@@ -294,7 +297,8 @@  static void mremap_expand_merge_offset(FILE *maps_fp, unsigned long page_size)
 		goto out;
 	}
 
-	success = is_range_mapped(maps_fp, start, start + 3 * page_size);
+	success = is_range_mapped(maps_fp, (unsigned long)start,
+				  (unsigned long)(start + 3 * page_size));
 	munmap(start, 3 * page_size);
 
 out: