linux-kernel - [PATCH] printf: add _

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Message-Id: <20251206-printf-kunit-printf-attr-v1-1-1682808b51d0@gmail.com>
Date: Sat, 06 Dec 2025 08:19:09 -0500
From: Tamir Duberstein <tamird@...nel.org>
To: Petr Mladek <pmladek@...e.com>, Steven Rostedt <rostedt@...dmis.org>, 
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, 
 Rasmus Villemoes <linux@...musvillemoes.dk>, 
 Sergey Senozhatsky <senozhatsky@...omium.org>
Cc: Kees Cook <kees@...nel.org>, linux-kernel@...r.kernel.org, 
 oe-kbuild-all@...ts.linux.dev, Tamir Duberstein <tamird@...il.com>, 
 kernel test robot <lkp@...el.com>
Subject: [PATCH] printf: add __printf attribute

From: Tamir Duberstein <tamird@...il.com>

This produces better diagnostics when incorrect inputs are passed.

Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202512061600.89CKQ3ag-lkp@intel.com/
Signed-off-by: Tamir Duberstein <tamird@...il.com>
---
 lib/tests/printf_kunit.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/tests/printf_kunit.c b/lib/tests/printf_kunit.c
index 7617e5b8b02c..13e2e9afae3b 100644
--- a/lib/tests/printf_kunit.c
+++ b/lib/tests/printf_kunit.c
@@ -266,7 +266,7 @@ hash_pointer(struct kunit *kunittest)
 	KUNIT_EXPECT_MEMNEQ(kunittest, buf, PTR_STR, PTR_WIDTH);
 }
 
-static void
+static void __printf(2, 3)
 test_hashed(struct kunit *kunittest, const char *fmt, const void *p)
 {
 	char buf[PLAIN_BUF_SIZE];

---
base-commit: 559e608c46553c107dbba19dae0854af7b219400
change-id: 20251206-printf-kunit-printf-attr-19369fc57bf0

Best regards,
--  
Tamir Duberstein <tamird@...il.com>