linux-kernel - [PATCH 2/3] kvm: commonize allocation of the new memory slots

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Message-Id: <1415963522-5255-3-git-send-email-pbonzini@redhat.com>
Date:	Fri, 14 Nov 2014 12:12:01 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:	yoshikawa_takuya_b1@....ntt.co.jp, imammedo@...hat.com
Subject: [PATCH 2/3] kvm: commonize allocation of the new memory slots

The two kmemdup invocations can be unified.  I find that the new
placement of the comment makes it easier to see what happens.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 virt/kvm/kvm_main.c | 28 +++++++++++-----------------
 1 file changed, 11 insertions(+), 17 deletions(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index c8ff99cc0ccb..7bfc842b96d7 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -865,11 +865,12 @@ int __kvm_set_memory_region(struct kvm *kvm,
 			goto out_free;
 	}
 
+	slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots),
+			GFP_KERNEL);
+	if (!slots)
+		goto out_free;
+
 	if ((change == KVM_MR_DELETE) || (change == KVM_MR_MOVE)) {
-		slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots),
-				GFP_KERNEL);
-		if (!slots)
-			goto out_free;
 		slot = id_to_memslot(slots, mem->slot);
 		slot->flags |= KVM_MEMSLOT_INVALID;
 
@@ -885,6 +886,12 @@ int __kvm_set_memory_region(struct kvm *kvm,
 		 * 	- kvm_is_visible_gfn (mmu_check_roots)
 		 */
 		kvm_arch_flush_shadow_memslot(kvm, slot);
+
+		/*
+		 * We can re-use the old_memslots from above, the only difference
+		 * from the currently installed memslots is the invalid flag.  This
+		 * will get overwritten by update_memslots anyway.
+		 */
 		slots = old_memslots;
 	}
 
@@ -892,19 +899,6 @@ int __kvm_set_memory_region(struct kvm *kvm,
 	if (r)
 		goto out_slots;
 
-	r = -ENOMEM;
-	/*
-	 * We can re-use the old_memslots from above, the only difference
-	 * from the currently installed memslots is the invalid flag.  This
-	 * will get overwritten by update_memslots anyway.
-	 */
-	if (!slots) {
-		slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots),
-				GFP_KERNEL);
-		if (!slots)
-			goto out_free;
-	}
-
 	/* actual memory is freed via old in kvm_free_physmem_slot below */
 	if (change == KVM_MR_DELETE) {
 		new.dirty_bitmap = NULL;
-- 
1.8.3.1


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