linux-kernel - [PATCH v1 5/6] vsnprintf: Mark pointer() with _

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Message-ID: <20250320180926.4002817-6-andriy.shevchenko@linux.intel.com>
Date: Thu, 20 Mar 2025 20:04:26 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Petr Mladek <pmladek@...e.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	Kees Cook <kees@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	"Masami Hiramatsu (Google)" <mhiramat@...nel.org>,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org
Cc: John Ogness <john.ogness@...utronix.de>,
	Sergey Senozhatsky <senozhatsky@...omium.org>,
	Andy Shevchenko <andy@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rasmus Villemoes <linux@...musvillemoes.dk>
Subject: [PATCH v1 5/6] vsnprintf: Mark pointer() with __printf() attribute

pointer() is using printf() type of format, and GCC compiler
(Debian 14.2.0-17) is not happy about this:

lib/vsprintf.c:2466:17: error: function ‘pointer’ might be a candidate for ‘gnu_printf’ format attribute [-Werror=suggest-attribute=format]

Fix the compilation errors (`make W=1` when CONFIG_WERROR=y, which is default)
by adding __printf() attribute.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 lib/vsprintf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 56fe96319292..8ebb5f866b08 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -2419,7 +2419,7 @@ char *rust_fmt_argument(char *buf, char *end, void *ptr);
  * from Rust code to format core::fmt::Arguments. Do *not* use it from C.
  * See rust/kernel/print.rs for details.
  */
-static noinline_for_stack
+static noinline_for_stack __printf(1, 0)
 char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 	      struct printf_spec spec)
 {
-- 
2.47.2