From: Ingo Molnar <mingo@elte.hu>
Date: Sat, 6 Jan 2007 00:36:59 +0000 (-0800)
Subject: [PATCH] KVM: Simplify mmu_alloc_roots()
X-Git-Tag: v2.6.20-rc4~16
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=68a99f6d37aa65e848e09ec6ea52848e93bd5de2;p=platform%2Fkernel%2Flinux-exynos.git

[PATCH] KVM: Simplify mmu_alloc_roots()

Small optimization/cleanup:

    page == page_header(page->page_hpa)

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c
index 4118e50..c6f9729 100644
--- a/drivers/kvm/mmu.c
+++ b/drivers/kvm/mmu.c
@@ -820,9 +820,9 @@ static void mmu_alloc_roots(struct kvm_vcpu *vcpu)
 		hpa_t root = vcpu->mmu.root_hpa;
 
 		ASSERT(!VALID_PAGE(root));
-		root = kvm_mmu_get_page(vcpu, root_gfn, 0,
-					PT64_ROOT_LEVEL, 0, NULL)->page_hpa;
-		page = page_header(root);
+		page = kvm_mmu_get_page(vcpu, root_gfn, 0,
+					PT64_ROOT_LEVEL, 0, NULL);
+		root = page->page_hpa;
 		++page->root_count;
 		vcpu->mmu.root_hpa = root;
 		return;
@@ -836,10 +836,10 @@ static void mmu_alloc_roots(struct kvm_vcpu *vcpu)
 			root_gfn = vcpu->pdptrs[i] >> PAGE_SHIFT;
 		else if (vcpu->mmu.root_level == 0)
 			root_gfn = 0;
-		root = kvm_mmu_get_page(vcpu, root_gfn, i << 30,
+		page = kvm_mmu_get_page(vcpu, root_gfn, i << 30,
 					PT32_ROOT_LEVEL, !is_paging(vcpu),
-					NULL)->page_hpa;
-		page = page_header(root);
+					NULL);
+		root = page->page_hpa;
 		++page->root_count;
 		vcpu->mmu.pae_root[i] = root | PT_PRESENT_MASK;
 	}