VM: add "vm_munmap()" helper function

Like the vm_brk() function, this is the same as "do_munmap()", except it
does the VM locking for the caller.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 3 deletions

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 4044ce0bf7c1..8beb9ce79364 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6366,10 +6366,8 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,
         if (!user_alloc && !old.user_alloc && old.rmap && !npages) {
                 int ret;
 
-                down_write(&current->mm->mmap_sem);
-                ret = do_munmap(current->mm, old.userspace_addr,
+                ret = vm_munmap(current->mm, old.userspace_addr,
                                 old.npages * PAGE_SIZE);
-                up_write(&current->mm->mmap_sem);
                 if (ret < 0)
                         printk(KERN_WARNING
                                "kvm_vm_ioctl_set_memory_region: "