dev/dax: fix uninitialized variable build warning

[ 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@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/dax/device.c b/drivers/dax/device.c
index 375b99b..7b0bf82 100644 (file)
--- 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++) {