linux-kernel - [PATCH AUTOSEL for 4.14 101/135] dev/dax: fix uninitialized variable build warning

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Message-ID: <20171207154513.4154-101-alexander.levin@verizon.com>
Date:   Thu, 7 Dec 2017 15:45:55 +0000
From:   alexander.levin@...izon.com
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Dan Williams <dan.j.williams@...el.com>,
        alexander.levin@...izon.com
Subject: [PATCH AUTOSEL for 4.14 101/135] dev/dax: fix uninitialized variable
 build warning

From: Ross Zwisler <ross.zwisler@...ux.intel.com>

[ Upstream commit 0a3ff78699d1817e711441715d22665475466036 ]

Fix this build warning:

warning: 'phys' may be used uninitialized in this function
[-Wuninitialized]

As reported here:

https://lkml.org/lkml/2017/10/16/152
http://kisskb.ellerman.id.au/kisskb/buildresult/13181373/log/

Signed-off-by: Ross Zwisler <ross.zwisler@...ux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/dax/device.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/dax/device.c b/drivers/dax/device.c
index 375b99bca002..7b0bf825c4e7 100644
--- a/drivers/dax/device.c
+++ b/drivers/dax/device.c
@@ -222,7 +222,8 @@ __weak phys_addr_t dax_pgoff_to_phys(struct dev_dax *dev_dax, pgoff_t pgoff,
 		unsigned long size)
 {
 	struct resource *res;
-	phys_addr_t phys;
+	/* gcc-4.6.3-nolibc for i386 complains that this is uninitialized */
+	phys_addr_t uninitialized_var(phys);
 	int i;
 
 	for (i = 0; i < dev_dax->num_resources; i++) {
-- 
2.11.0