[LTP] [PATCH] syscalls/munmap04: Stop using MAP_FIXED_NOREPLACE

[Ricardo B. Marlière]

From: Ricardo B. Marlière <rbm@suse.com>

On some machines, mmap() call might return MAP_FAILED when passed the
MAP_FIXED_NOREPLACE flag for reasons other than what the test expect: vma
limit reached. While at it, add a sanity check if no regions were mapped.

Signed-off-by: Ricardo B. Marlière <rbm@suse.com>
---
 testcases/kernel/syscalls/munmap/munmap04.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/testcases/kernel/syscalls/munmap/munmap04.c b/testcases/kernel/syscalls/munmap/munmap04.c
index e046d17a75f8f75c5b11d569c33da41d7adc7d09..f55aa770a99d2facb53234fa593fa3f41a16cb00 100644
--- a/testcases/kernel/syscalls/munmap/munmap04.c
+++ b/testcases/kernel/syscalls/munmap/munmap04.c
@@ -37,8 +37,7 @@ static void setup(void)
 
 	while (1) {
 		void *p = mmap((void *)(base + PAD * vma_size * map_count),
-			     vma_size, PROT_NONE,
-			     MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED_NOREPLACE,
+			     vma_size, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS,
 			     -1, 0);
 		if (p == MAP_FAILED)
 			break;
@@ -46,8 +45,9 @@ static void setup(void)
 	}
 
 	if (map_count == MAP_MAX_COUNT)
-		tst_brk(TBROK, "Mapped all %d regions, expected less",
-			map_count);
+		tst_brk(TBROK, "Mapped all %d regions, expected less", map_count);
+	if (map_count == 0)
+		tst_brk(TBROK, "Mapped 0 regions");
 
 	tst_res(TINFO, "Mapped %d regions", map_count);
 }

---
base-commit: 6af619552ce7676171e47b88964ffb5b08499b36
change-id: 20250728-fixes-munmap04-02083c550c6b

Best regards,
-- 
Ricardo B. Marlière <rbm@suse.com>