linux-kernel - [PATCH] samples/vfs: fix printf format string for size

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Message-Id: <20250224141406.1400864-1-arnd@kernel.org>
Date: Mon, 24 Feb 2025 15:14:00 +0100
From: Arnd Bergmann <arnd@...nel.org>
To: Christian Brauner <brauner@...nel.org>,
	Jeff Layton <jlayton@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] samples/vfs: fix printf format string for size_t

From: Arnd Bergmann <arnd@...db.de>

size_t needs a %z format string modifier instead of %l

samples/vfs/test-list-all-mounts.c:152:39: warning: format specifies type 'unsigned long' but the argument has type 'size_t' (aka 'unsigned int') [-Wformat]
  152 |                                         printf("mnt_uidmap[%lu]:\t%s\n", idx, idmap);
      |                                                            ~~~           ^~~
      |                                                            %zu
samples/vfs/test-list-all-mounts.c:161:39: warning: format specifies type 'unsigned long' but the argument has type 'size_t' (aka 'unsigned int') [-Wformat]
  161 |                                         printf("mnt_gidmap[%lu]:\t%s\n", idx, idmap);
      |                                                            ~~~           ^~~
      |                                                            %zu

Fixes: fa204a65f1b6 ("samples/vfs: add STATMOUNT_MNT_{G,U}IDMAP")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 samples/vfs/test-list-all-mounts.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/samples/vfs/test-list-all-mounts.c b/samples/vfs/test-list-all-mounts.c
index bb3b83d8f1d7..713c174626aa 100644
--- a/samples/vfs/test-list-all-mounts.c
+++ b/samples/vfs/test-list-all-mounts.c
@@ -149,7 +149,7 @@ int main(int argc, char *argv[])
 				const char *idmap = stmnt->str + stmnt->mnt_uidmap;
 
 				for (size_t idx = 0; idx < stmnt->mnt_uidmap_num; idx++) {
-					printf("mnt_uidmap[%lu]:\t%s\n", idx, idmap);
+					printf("mnt_uidmap[%zu]:\t%s\n", idx, idmap);
 					idmap += strlen(idmap) + 1;
 				}
 			}
@@ -158,7 +158,7 @@ int main(int argc, char *argv[])
 				const char *idmap = stmnt->str + stmnt->mnt_gidmap;
 
 				for (size_t idx = 0; idx < stmnt->mnt_gidmap_num; idx++) {
-					printf("mnt_gidmap[%lu]:\t%s\n", idx, idmap);
+					printf("mnt_gidmap[%zu]:\t%s\n", idx, idmap);
 					idmap += strlen(idmap) + 1;
 				}
 			}
-- 
2.39.5