linux-kernel - Re: [PATCH] drm/amdgpu: Use vma_lookup() in amdgpu_ttm_tt_get_user

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Date:   Fri, 4 Jun 2021 13:11:36 +0200
From:   Christian König <ckoenig.leichtzumerken@...il.com>
To:     Liam Howlett <liam.howlett@...cle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>
Subject: Re: [PATCH] drm/amdgpu: Use vma_lookup() in
 amdgpu_ttm_tt_get_user_pages()

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@...cle.com>

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

> ---
>   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;
>   	}