Re: [PATCH] drm/amdgpu: Use vma_lookup() in amdgpu_ttm_tt_get_user_pages()

[Christian König <ckoenig.leichtzumerken@xxxxxxxxx>]

Am 03.06.21 um 18:09 schrieb Liam Howlett:
> Use vma_lookup() to find the VMA at a specific address.  As vma_lookup()
> will return NULL if the address is not within any VMA, the start address
> no longer needs to be validated.
>
> Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>

Reviewed-by: Christian König <christian.koenig@xxxxxxx>

> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> index 7cb7ffdd1900..dfb5ca3f8da8 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> @@ -680,9 +680,9 @@ int amdgpu_ttm_tt_get_user_pages(struct amdgpu_bo *bo, struct page **pages)
>   		return -ESRCH;
>   
>   	mmap_read_lock(mm);
> -	vma = find_vma(mm, start);
> +	vma = vma_lookup(mm, start);
>   	mmap_read_unlock(mm);
> -	if (unlikely(!vma || start < vma->vm_start)) {
> +	if (unlikely(!vma)) {
>   		r = -EFAULT;
>   		goto out_putmm;
>   	}