[PATCH] selftests/landlock: print st_ino as unsigned long long

[PATCH] selftests/landlock: print st_ino as unsigned long long

[Sasha Levin]

On 32-bit architectures with a 64-bit ino_t, st_ino is an unsigned long
long, and printing it with %lu warns:

  fs_test.c:10511:57: warning: format '%lu' expects argument of type 'long unsigned int', but argument 4 has type '__ino64_t' {aka 'long long unsigned int'} [-Wformat=]

Cast it to unsigned long long and print it with %llu.

Signed-off-by: Sasha Levin <sashal@kernel.org>
---
Found with a 32-bit build of the selftests with a 64-bit time_t (gcc 16
and clang 21 with -m32 -D_TIME_BITS=64 -D_FILE_OFFSET_BITS=64);
KernelCI's 32-bit arm builds show the same warnings. The changed files
build without format warnings there now, and the x86_64 builds don't
change. The other selftests get the same kind of fix in separate
patches.

 tools/testing/selftests/landlock/fs_test.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/landlock/fs_test.c b/tools/testing/selftests/landlock/fs_test.c
index f725882fa4a78..a2dc9a7f0481a 100644
--- a/tools/testing/selftests/landlock/fs_test.c
+++ b/tools/testing/selftests/landlock/fs_test.c
@@ -10508,7 +10508,8 @@ TEST_F(trace_layout1, check_rule_fs_fields)
 	ASSERT_EQ(0, stat(dir_s1d1, &dir_stat));
 	snprintf(expected_dev, sizeof(expected_dev), "%u:%u",
 		 major(dir_stat.st_dev), minor(dir_stat.st_dev));
-	snprintf(expected_ino, sizeof(expected_ino), "%lu", dir_stat.st_ino);
+	snprintf(expected_ino, sizeof(expected_ino), "%llu",
+		 (unsigned long long)dir_stat.st_ino);
 
 	set_cap(_metadata, CAP_DAC_OVERRIDE);
 	ASSERT_EQ(0, tracefs_clear());
-- 
2.53.0

Re: [PATCH] selftests/landlock: print st_ino as unsigned long long

[Günther Noack]

On Tue, Nov 03, 2026 at 10:55:12AM -0500, Sasha Levin wrote:
> On 32-bit architectures with a 64-bit ino_t, st_ino is an unsigned long
> long, and printing it with %lu warns:
> 
>   fs_test.c:10511:57: warning: format '%lu' expects argument of type 'long unsigned int', but argument 4 has type '__ino64_t' {aka 'long long unsigned int'} [-Wformat=]
> 
> Cast it to unsigned long long and print it with %llu.
> 
> Signed-off-by: Sasha Levin <sashal@kernel.org>
> ---
> Found with a 32-bit build of the selftests with a 64-bit time_t (gcc 16
> and clang 21 with -m32 -D_TIME_BITS=64 -D_FILE_OFFSET_BITS=64);
> KernelCI's 32-bit arm builds show the same warnings. The changed files
> build without format warnings there now, and the x86_64 builds don't
> change. The other selftests get the same kind of fix in separate
> patches.
> 
>  tools/testing/selftests/landlock/fs_test.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/landlock/fs_test.c b/tools/testing/selftests/landlock/fs_test.c
> index f725882fa4a78..a2dc9a7f0481a 100644
> --- a/tools/testing/selftests/landlock/fs_test.c
> +++ b/tools/testing/selftests/landlock/fs_test.c
> @@ -10508,7 +10508,8 @@ TEST_F(trace_layout1, check_rule_fs_fields)
>  	ASSERT_EQ(0, stat(dir_s1d1, &dir_stat));
>  	snprintf(expected_dev, sizeof(expected_dev), "%u:%u",
>  		 major(dir_stat.st_dev), minor(dir_stat.st_dev));
> -	snprintf(expected_ino, sizeof(expected_ino), "%lu", dir_stat.st_ino);
> +	snprintf(expected_ino, sizeof(expected_ino), "%llu",
> +		 (unsigned long long)dir_stat.st_ino);
>  
>  	set_cap(_metadata, CAP_DAC_OVERRIDE);
>  	ASSERT_EQ(0, tracefs_clear());
> -- 
> 2.53.0
> 

Reviewed-by: Günther Noack <gnoack3000@gmail.com>

Thank you!
–Günther