From: Heiko Carstens <hca@linux.ibm.com>
Date: Thu, 18 Nov 2021 17:06:06 +0100
Subject: s390/ctcm: add __printf format attribute to ctcm_dbf_longtext
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Git-commit: dddbf91387a04a03a8e071cb4857403df219382e
Patch-mainline: v5.17-rc1
References: jsc#PED-594 LTC#198619

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@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/s390/net/ctcm_dbug.h |    1 +
 1 file changed, 1 insertion(+)

--- 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[CTC
 
 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)