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xen/xenbus: fix W=1 build warning in xenbus_va_dev_error function 

This patch fixes a W=1 format-string warning reported by GCC 12.3.0
by annotating xenbus_switch_fatal() and xenbus_va_dev_error()
with the __printf attribute. The attribute enables compile-time
validation of printf-style format strings in these functions.

The original warning trace:
drivers/xen/xenbus/xenbus_client.c:304:9: warning: function 'xenbus_va_dev_error' might be
a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]

Signed-off-by: Peng Jiang <jiang.peng9@zte.com.cn>
Reviewed-by: Juergen Gross <jgross@suse.com>
Message-ID: <20250620084104786r5xoR16_AmYZMJLnno3_Q@zte.com.cn>
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Peng Jiang 2025-06-20 08:41:04 +08:00 committed by Juergen Gross
parent 347e9f5043
commit b7efeb081e
1 changed files with 2 additions and 0 deletions
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2
drivers/xen/xenbus/xenbus_client.c
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@ -202,6 +202,7 @@ int xenbus_watch_pathfmt(struct xenbus_device *dev,
}
EXPORT_SYMBOL_GPL(xenbus_watch_pathfmt);
__printf(4, 5)
static void xenbus_switch_fatal(struct xenbus_device *, int, int,
const char *, ...);
@ -287,6 +288,7 @@ int xenbus_frontend_closed(struct xenbus_device *dev)
}
EXPORT_SYMBOL_GPL(xenbus_frontend_closed);
__printf(3, 0)
static void xenbus_va_dev_error(struct xenbus_device *dev, int err,
const char *fmt, va_list ap)
{