sedf/build: Fix build when using -fno-inline

[Andrew Cooper <andrew.cooper3@citrix.com>]

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I found this issue while trying to debug on a separate issue.  It
certainly affects unstable thru 4.1, and probably earlier, so should be
take for backport.

-- 
Andrew Cooper - Dom0 Kernel Engineer, Citrix XenServer
T: +44 (0)1223 225 900, http://www.citrix.com


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# HG changeset patch
# Parent 5fbdbf585f5f2ee9a3e3c75a8a9f9f2cc6eda65c
build: Fix build when using -fno-inline

struct task_slice.migrated is not initialised by this function, and
subsequently returned by value, leading to the error:

sched_sedf.c: In function ‘sedf_do_extra_schedule’:
sched_sedf.c:711: error: ‘ret.migrated’ may be used uninitialised in
this function

for both gcc 4.1.2 and 4.4.3 (which are the two I have easily to hand)
when combined with the -fno-inline compile option.

Signed-off-by Andrew Cooper <andrew.cooper3@citrix.com>

--
This is compile tested only, but given that the sole caller of
sedf_do_extra_schedule() unconditionally sets migrated to 0, I am fairly
confident of the correctness of the fix.

diff -r 5fbdbf585f5f xen/common/sched_sedf.c
--- a/xen/common/sched_sedf.c
+++ b/xen/common/sched_sedf.c
@@ -667,7 +667,7 @@ static void desched_extra_dom(s_time_t n
 static struct task_slice sedf_do_extra_schedule(
     s_time_t now, s_time_t end_xt, struct list_head *extraq[], int cpu)
 {
-    struct task_slice   ret;
+    struct task_slice   ret = { 0 };
     struct sedf_vcpu_info *runinf;
     ASSERT(end_xt > now);
 

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