VMX: fix vmx_{find,del}_msr() build

Older gcc at -O2 (and perhaps higher) does not recognize that apparently
uninitialized variables aren't really uninitialized. Pull out the
assignments used by two of the three case blocks and make them
initializers of the variables, as I think I had suggested during review.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Kevin Tian <kevin.tian@intel.com>
(cherry picked from commit 97cb0516a322ecdf0032fa9d8aa1525c03d7772f)

diff --git a/xen/arch/x86/hvm/vmx/vmcs.c b/xen/arch/x86/hvm/vmx/vmcs.c
index ca652c49cb0591f6a86d834c16baead51c650a59..30a33dd0bda5ff55bb7379ac2891849d4969dae7 100644 (file)
--- a/xen/arch/x86/hvm/vmx/vmcs.c
+++ b/xen/arch/x86/hvm/vmx/vmcs.c
@@ -1310,7 +1310,8 @@ struct vmx_msr_entry *vmx_find_msr(const struct vcpu *v, uint32_t msr,
 {
     const struct arch_vmx_struct *vmx = &v->arch.hvm_vmx;
     struct vmx_msr_entry *start = NULL, *ent, *end;
-    unsigned int substart, subend, total;
+    unsigned int substart = 0, subend = vmx->msr_save_count;
+    unsigned int total = vmx->msr_load_count;
 
     ASSERT(v == current || !vcpu_runnable(v));
 
@@ -1318,23 +1319,18 @@ struct vmx_msr_entry *vmx_find_msr(const struct vcpu *v, uint32_t msr,
     {
     case VMX_MSR_HOST:
         start    = vmx->host_msr_area;
-        substart = 0;
         subend   = vmx->host_msr_count;
         total    = subend;
         break;
 
     case VMX_MSR_GUEST:
         start    = vmx->msr_area;
-        substart = 0;
-        subend   = vmx->msr_save_count;
-        total    = vmx->msr_load_count;
         break;
 
     case VMX_MSR_GUEST_LOADONLY:
         start    = vmx->msr_area;
-        substart = vmx->msr_save_count;
-        subend   = vmx->msr_load_count;
-        total    = subend;
+        substart = subend;
+        subend   = total;
         break;
 
     default: