x86/PVH: Use unsigned int for dom0 e820 index

Switch to unsigned int for the dom0 e820 index.  This eliminates the
potential for array underflows, and the compiler might be able to
generate better code.

Requested-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Jason Andryuk <jason.andryuk@amd.com>
Acked-by: Jan Beulich <jbeulich@suse.com>

diff --git a/xen/arch/x86/hvm/dom0_build.c b/xen/arch/x86/hvm/dom0_build.c
index d158f4d241389c1c3bd28de764895c40345a199b..ac71d43a6b3fd83bb064ebf68265cad0d907e4ea 100644 (file)
--- a/xen/arch/x86/hvm/dom0_build.c
+++ b/xen/arch/x86/hvm/dom0_build.c
@@ -569,7 +569,7 @@ static paddr_t __init find_kernel_memory(
 {
     paddr_t kernel_size = elf->dest_size;
     unsigned int align;
-    int i;
+    unsigned int i;
 
     if ( parms->phys_align != UNSET_ADDR32 )
         align = parms->phys_align;
@@ -579,7 +579,7 @@ static paddr_t __init find_kernel_memory(
         align = MB(2);
 
     /* Search backwards to find the highest address. */
-    for ( i = d->arch.nr_e820 - 1; i >= 0 ; i-- )
+    for ( i = d->arch.nr_e820; i--; )
     {
         paddr_t start = d->arch.e820[i].addr;
         paddr_t end = start + d->arch.e820[i].size;