KVM: Remove unnecessary divide operations

[deliverable/linux.git] / arch / x86 / kvm / mmu.c

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index ca07ed083b59a4d1cc8d436215528dbcf9b3a384..a20fd613acfe5afd1a65cf14d11c30c25be9b324 100644 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -423,8 +423,8 @@ static int *slot_largepage_idx(gfn_t gfn,
 {
        unsigned long idx;
 
-       idx = (gfn / KVM_PAGES_PER_HPAGE(level)) -
-             (slot->base_gfn / KVM_PAGES_PER_HPAGE(level));
+       idx = (gfn >> KVM_HPAGE_GFN_SHIFT(level)) -
+             (slot->base_gfn >> KVM_HPAGE_GFN_SHIFT(level));
        return &slot->lpage_info[level - 2][idx].write_count;
 }
 
@@ -528,8 +528,8 @@ static unsigned long *gfn_to_rmap(struct kvm *kvm, gfn_t gfn, int level)
        if (likely(level == PT_PAGE_TABLE_LEVEL))
                return &slot->rmap[gfn - slot->base_gfn];
 
-       idx = (gfn / KVM_PAGES_PER_HPAGE(level)) -
-               (slot->base_gfn / KVM_PAGES_PER_HPAGE(level));
+       idx = (gfn >> KVM_HPAGE_GFN_SHIFT(level)) -
+               (slot->base_gfn >> KVM_HPAGE_GFN_SHIFT(level));
 
        return &slot->lpage_info[level - 2][idx].rmap_pde;
 }