linux-kernel - [PATCH v2 1/1] audit: Mark audit_log_vformat() with _

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Message-ID: <20250313085343.241623-1-andriy.shevchenko@linux.intel.com>
Date: Thu, 13 Mar 2025 10:52:39 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Paul Moore <paul@...l-moore.com>,
	Casey Schaufler <casey@...aufler-ca.com>,
	audit@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Eric Paris <eparis@...hat.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v2 1/1] audit: Mark audit_log_vformat() with __printf() attribute

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

kernel/audit.c:1978:9: error: function ‘audit_log_vformat’ might be a candidate for ‘gnu_printf’ format attribute [-Werror=suggest-attribute=format]
kernel/audit.c:1987:17: error: function ‘audit_log_vformat’ 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>
---

v2: added necessary technical information to the commit message (Paul)

 kernel/audit.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/audit.c b/kernel/audit.c
index 5f5bf85bcc90..f365e1bbeac6 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1956,8 +1956,8 @@ static inline int audit_expand(struct audit_buffer *ab, int extra)
  * will be called a second time.  Currently, we assume that a printk
  * can't format message larger than 1024 bytes, so we don't either.
  */
-static void audit_log_vformat(struct audit_buffer *ab, const char *fmt,
-			      va_list args)
+static __printf(2, 0)
+void audit_log_vformat(struct audit_buffer *ab, const char *fmt, va_list args)
 {
 	int len, avail;
 	struct sk_buff *skb;
-- 
2.47.2