linux-kernel - [PATCH 1/2] dev/dax: fix uninitialized variable build warning

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Date:   Wed, 18 Oct 2017 09:40:05 -0600
From:   Ross Zwisler <ross.zwisler@...ux.intel.com>
To:     linux-kernel@...r.kernel.org
Cc:     Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Dan Williams <dan.j.williams@...el.com>,
        linux-nvdimm@...ts.01.org
Subject: [PATCH 1/2] dev/dax: fix uninitialized variable build warning

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

This should have no functional change because you can only get into the if
statement in dax_pgoff_to_phys() that is complaining about 'phys' being
uninitialized if you broke out early in the above loop, in which case
'phys' will be set.

Signed-off-by: Ross Zwisler <ross.zwisler@...ux.intel.com>
---
 drivers/dax/device.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dax/device.c b/drivers/dax/device.c
index e9f3b3e..4aca0a2 100644
--- a/drivers/dax/device.c
+++ b/drivers/dax/device.c
@@ -222,7 +222,7 @@ __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;
+	phys_addr_t phys = 0;
 	int i;
 
 	for (i = 0; i < dev_dax->num_resources; i++) {
-- 
2.9.5