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    Subject[PATCH 2/5] uio: Kill unused vma_count.

    Remove the tracking of how many vmas are using in the uio memory
    mapping mode. The uio code doesn't use that information anywhere.

    Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
    ---
    drivers/uio/uio.c | 16 ----------------
    1 files changed, 0 insertions(+), 16 deletions(-)

    diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
    index 565559c..95f25ae 100644
    --- a/drivers/uio/uio.c
    +++ b/drivers/uio/uio.c
    @@ -35,7 +35,6 @@ struct uio_device {
    atomic_t event;
    struct fasync_struct *async_queue;
    wait_queue_head_t wait;
    - int vma_count;
    struct uio_info *info;
    struct kobject *map_dir;
    struct kobject *portio_dir;
    @@ -599,18 +598,6 @@ static int uio_find_mem_index(struct vm_area_struct *vma)
    return -1;
    }

    -static void uio_vma_open(struct vm_area_struct *vma)
    -{
    - struct uio_device *idev = vma->vm_private_data;
    - idev->vma_count++;
    -}
    -
    -static void uio_vma_close(struct vm_area_struct *vma)
    -{
    - struct uio_device *idev = vma->vm_private_data;
    - idev->vma_count--;
    -}
    -
    static int uio_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
    {
    struct uio_device *idev = vma->vm_private_data;
    @@ -638,8 +625,6 @@ static int uio_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
    }

    static const struct vm_operations_struct uio_vm_ops = {
    - .open = uio_vma_open,
    - .close = uio_vma_close,
    .fault = uio_vma_fault,
    };

    @@ -665,7 +650,6 @@ static int uio_mmap_logical(struct vm_area_struct *vma)
    {
    vma->vm_flags |= VM_RESERVED;
    vma->vm_ops = &uio_vm_ops;
    - uio_vma_open(vma);
    return 0;
    }

    --
    1.7.2.2


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