[PATCH] drm: add a check to verify the size alignment

[Paul Menzel]

Dear Arunpravin,


Am 21.03.22 um 06:59 schrieb Arunpravin Paneer Selvam:
> add a simple check to reject any size not aligned to the
> min_page_size.

Nit: I’d start sentences with a capital letter.

Could you please add a summary of the discussion to the commit message, 
so the question “Why?” is answered?


Kind regards,

Paul


> Signed-off-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam at amd.com>
> ---
>   drivers/gpu/drm/drm_buddy.c | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_buddy.c b/drivers/gpu/drm/drm_buddy.c
> index 72f52f293249..b503c88786b0 100644
> --- a/drivers/gpu/drm/drm_buddy.c
> +++ b/drivers/gpu/drm/drm_buddy.c
> @@ -661,6 +661,9 @@ int drm_buddy_alloc_blocks(struct drm_buddy *mm,
>   	if (range_overflows(start, size, mm->size))
>   		return -EINVAL;
>   
> +	if (WARN_ON(!IS_ALIGNED(size, min_page_size)))
> +		return -EINVAL;
> +
>   	/* Actual range allocation */
>   	if (start + size == end)
>   		return __drm_buddy_alloc_range(mm, start, size, blocks);