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    Subject[PATCH v4 18/66] xen: Use vma_lookup() in privcmd_ioctl_mmap()
    Date
    From: "Liam R. Howlett" <Liam.Howlett@Oracle.com>

    vma_lookup() walks the VMA tree for a specific value, find_vma() will
    search the tree after walking to a specific value. It is more efficient
    to only walk to the requested value as this case requires the address to
    equal the vm_start.

    Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
    ---
    drivers/xen/privcmd.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c
    index 3369734108af..ad17166b0ef6 100644
    --- a/drivers/xen/privcmd.c
    +++ b/drivers/xen/privcmd.c
    @@ -282,7 +282,7 @@ static long privcmd_ioctl_mmap(struct file *file, void __user *udata)
    struct page, lru);
    struct privcmd_mmap_entry *msg = page_address(page);

    - vma = find_vma(mm, msg->va);
    + vma = vma_lookup(mm, msg->va);
    rc = -EINVAL;

    if (!vma || (msg->va != vma->vm_start) || vma->vm_private_data)
    --
    2.30.2
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