lib/test_printf.c: fix clang -Wformat warnings

JustinStitt · pmladek · commit 96dd9a2f958b · 2022-07-28T10:38:30.000+02:00
see warnings: | lib/test_printf.c:157:52: error: format specifies type 'unsigned char' | but the argument has type 'int' [-Werror,-Wformat] test("0|1|1|128|255", | "%hhu|%hhu|%hhu|%hhu|%hhu", 0, 1, 257, 128, -1); - | lib/test_printf.c:158:55: error: format specifies type 'char' but the | argument has type 'int' [-Werror,-Wformat] test("0|1|1|-128|-1", | "%hhd|%hhd|%hhd|%hhd|%hhd", 0, 1, 257, 128, -1); - | lib/test_printf.c:159:41: error: format specifies type 'unsigned short' | but the argument has type 'int' [-Werror,-Wformat] | test("2015122420151225", "%ho%ho%#ho", 1037, 5282, -11627); There's an ongoing movement to eventually enable the -Wformat flag for clang. Previous patches have targeted incorrect usage of format specifiers. In this case, however, the "incorrect" format specifiers are intrinsically part of the test cases. Hence, fixing them would be misaligned with their intended purpose. My proposed fix is to simply disable the warnings so that one day a clean build of the kernel with clang (and -Wformat enabled) would be possible. It would also keep us in the green for alot of the CI bots. Link: ClangBuiltLinux#378 Suggested-by: Nathan Chancellor <nathan@kernel.org> Suggested-by: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Justin Stitt <justinstitt@google.com> Reviewed-by: Petr Mladek <pmladek@suse.com> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Petr Mladek <pmladek@suse.com> Link: https://lore.kernel.org/r/20220718230626.1029318-1-justinstitt@google.com
diff --git a/lib/test_printf.c b/lib/test_printf.c
@@ -30,6 +30,12 @@
 #define PAD_SIZE 16
 #define FILL_CHAR '$'
 
+#define NOWARN(option, comment, block) \
+	__diag_push(); \
+	__diag_ignore_all(#option, comment); \
+	block \
+	__diag_pop();
+
 KSTM_MODULE_GLOBALS();
 
 static char *test_buffer __initdata;
@@ -159,9 +165,11 @@ test_number(void)
 	test("0x1234abcd  ", "%#-12x", 0x1234abcd);
 	test("  0x1234abcd", "%#12x", 0x1234abcd);
 	test("0|001| 12|+123| 1234|-123|-1234", "%d|%03d|%3d|%+d|% d|%+d|% d", 0, 1, 12, 123, 1234, -123, -1234);
-	test("0|1|1|128|255", "%hhu|%hhu|%hhu|%hhu|%hhu", 0, 1, 257, 128, -1);
-	test("0|1|1|-128|-1", "%hhd|%hhd|%hhd|%hhd|%hhd", 0, 1, 257, 128, -1);
-	test("2015122420151225", "%ho%ho%#ho", 1037, 5282, -11627);
+	NOWARN(-Wformat, "Intentionally test narrowing conversion specifiers.", {
+		test("0|1|1|128|255", "%hhu|%hhu|%hhu|%hhu|%hhu", 0, 1, 257, 128, -1);
+		test("0|1|1|-128|-1", "%hhd|%hhd|%hhd|%hhd|%hhd", 0, 1, 257, 128, -1);
+		test("2015122420151225", "%ho%ho%#ho", 1037, 5282, -11627);
+	})
 	/*
 	 * POSIX/C99: »The result of converting zero with an explicit
 	 * precision of zero shall be no characters.« Hence the output
