linux-kernel - [PATCH] thunderbolt: fix -Wrestrict warning

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Message-Id: <20210927131620.1587294-1-arnd@kernel.org>
Date:   Mon, 27 Sep 2021 15:16:11 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Yehezkel Bernat <YehezkelShB@...il.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Isaac Hazan <isaac.hazan@...el.com>,
        Lee Jones <lee.jones@...aro.org>,
        Rikard Falkeborn <rikard.falkeborn@...il.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] thunderbolt: fix -Wrestrict warning

From: Arnd Bergmann <arnd@...db.de>

gcc-11 warns when building with W=1:

drivers/thunderbolt/xdomain.c: In function 'modalias_show':
drivers/thunderbolt/xdomain.c:733:16: error: 'sprintf' argument 3 overlaps destination object 'buf' [-Werror=restrict]
  733 |         return sprintf(buf, "%s\n", buf);
      |                ^~~~~~~~~~~~~~~~~~~~~~~~~
drivers/thunderbolt/xdomain.c:727:36: note: destination object referenced by 'restrict'-qualified argument 1 was declared here
  727 |                              char *buf)
      |                              ~~~~~~^~~

There is no need for the sprintf() here when a strcat() does
the same thing.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/thunderbolt/xdomain.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/thunderbolt/xdomain.c b/drivers/thunderbolt/xdomain.c
index d66ea4d616fd..eff32499610f 100644
--- a/drivers/thunderbolt/xdomain.c
+++ b/drivers/thunderbolt/xdomain.c
@@ -730,7 +730,7 @@ static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
 
 	/* Full buffer size except new line and null termination */
 	get_modalias(svc, buf, PAGE_SIZE - 2);
-	return sprintf(buf, "%s\n", buf);
+	return strlen(strcat(buf, "\n"));
 }
 static DEVICE_ATTR_RO(modalias);
 
-- 
2.29.2