linux-kernel - [PATCH] selftests: Mark ksft_exit_fail_perror() as _

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Date: Sun, 14 Apr 2024 11:26:53 +0500
From: Muhammad Usama Anjum <usama.anjum@...labora.com>
To: Shuah Khan <shuah@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>
Cc: Muhammad Usama Anjum <usama.anjum@...labora.com>,
	kernel@...labora.com,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev
Subject: [PATCH] selftests: Mark ksft_exit_fail_perror() as __noreturn

Let the compilers (clang) know that this function would just call
exit() and would never return. It is needed to avoid false positive
static analysis errors. All similar functions calling exit()
unconditionally have been marked as __noreturn.

Signed-off-by: Muhammad Usama Anjum <usama.anjum@...labora.com>
---
This patch has been suggested [1] and tested on top of the following
patches:
- f07041728422 ("selftests: add ksft_exit_fail_perror()") which is
  in kselftest tree already
- ("kselftest: Mark functions that unconditionally call exit() as
  __noreturn") would appear in tip/timers/urgent

[1] https://lore.kernel.org/all/8254ab4d-9cb6-402e-80dd-d9ec70d77de5@linuxfoundation.org
---
 tools/testing/selftests/kselftest.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kselftest.h b/tools/testing/selftests/kselftest.h
index 050c5fd018400..b43a7a7ca4b40 100644
--- a/tools/testing/selftests/kselftest.h
+++ b/tools/testing/selftests/kselftest.h
@@ -372,7 +372,7 @@ static inline __printf(1, 2) int ksft_exit_fail_msg(const char *msg, ...)
 	exit(KSFT_FAIL);
 }
 
-static inline void ksft_exit_fail_perror(const char *msg)
+static inline __noreturn void ksft_exit_fail_perror(const char *msg)
 {
 #ifndef NOLIBC
 	ksft_exit_fail_msg("%s: %s (%d)\n", msg, strerror(errno), errno);
-- 
2.39.2