netdev - [PATCH net-next 5/6] s390/ctcm: add __printf format attribute to ctcm_dbf

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Date:   Thu, 18 Nov 2021 17:06:06 +0100
From:   Karsten Graul <kgraul@...ux.ibm.com>
To:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, linux-s390@...r.kernel.org,
        Heiko Carstens <hca@...ux.ibm.com>,
        Julian Wiedmann <jwi@...ux.ibm.com>
Subject: [PATCH net-next 5/6] s390/ctcm: add __printf format attribute to ctcm_dbf_longtext

From: Heiko Carstens <hca@...ux.ibm.com>

Allow the compiler to recognize and check format strings and parameters.

As reported with allmodconfig and W=1:

drivers/s390/net/ctcm_dbug.c: In function ‘ctcm_dbf_longtext’:
drivers/s390/net/ctcm_dbug.c:73:9: error: function ‘ctcm_dbf_longtext’ might be a candidate for ‘gnu_printf’ format attribute [-Werror=suggest-attribute=format]
   73 |         vsnprintf(dbf_txt_buf, sizeof(dbf_txt_buf), fmt, args);
      |         ^~~~~~~~~

Acked-by: Julian Wiedmann <jwi@...ux.ibm.com>
Signed-off-by: Heiko Carstens <hca@...ux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@...ux.ibm.com>
---
 drivers/s390/net/ctcm_dbug.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/s390/net/ctcm_dbug.h b/drivers/s390/net/ctcm_dbug.h
index 675575ef162e..cce11daf3245 100644
--- a/drivers/s390/net/ctcm_dbug.h
+++ b/drivers/s390/net/ctcm_dbug.h
@@ -65,6 +65,7 @@ extern struct ctcm_dbf_info ctcm_dbf[CTCM_DBF_INFOS];
 
 int ctcm_register_dbf_views(void);
 void ctcm_unregister_dbf_views(void);
+__printf(3, 4)
 void ctcm_dbf_longtext(enum ctcm_dbf_names dbf_nix, int level, char *text, ...);
 
 static inline const char *strtail(const char *s, int n)
-- 
2.25.1