[PATCH 1/2] drm/buddy: stop using PAGE_SIZE

[Christian König]

Am 29.02.24 um 11:51 schrieb Matthew Auld:
> The drm_buddy minimum page-size requirements should be distinct from the
> CPU PAGE_SIZE. Only restriction is that the minimum page-size is at
> least 4K.
>
> Signed-off-by: Matthew Auld <matthew.auld at intel.com>
> Cc: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam at amd.com>
> Cc: Christian König <christian.koenig at amd.com>
> Cc: Arnd Bergmann <arnd at arndb.de>

Acked-by: Christian König <christian.koenig at amd.com> for the series.

> ---
>   drivers/gpu/drm/drm_buddy.c | 2 +-
>   include/drm/drm_buddy.h     | 6 +++---
>   2 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_buddy.c b/drivers/gpu/drm/drm_buddy.c
> index 5ebdd6f8f36e..f999568d69c1 100644
> --- a/drivers/gpu/drm/drm_buddy.c
> +++ b/drivers/gpu/drm/drm_buddy.c
> @@ -102,7 +102,7 @@ int drm_buddy_init(struct drm_buddy *mm, u64 size, u64 chunk_size)
>   	if (size < chunk_size)
>   		return -EINVAL;
>   
> -	if (chunk_size < PAGE_SIZE)
> +	if (chunk_size < SZ_4K)
>   		return -EINVAL;
>   
>   	if (!is_power_of_2(chunk_size))
> diff --git a/include/drm/drm_buddy.h b/include/drm/drm_buddy.h
> index a5b39fc01003..19ed661a32f3 100644
> --- a/include/drm/drm_buddy.h
> +++ b/include/drm/drm_buddy.h
> @@ -53,8 +53,8 @@ struct drm_buddy_block {
>   	struct list_head tmp_link;
>   };
>   
> -/* Order-zero must be at least PAGE_SIZE */
> -#define DRM_BUDDY_MAX_ORDER (63 - PAGE_SHIFT)
> +/* Order-zero must be at least SZ_4K */
> +#define DRM_BUDDY_MAX_ORDER (63 - 12)
>   
>   /*
>    * Binary Buddy System.
> @@ -82,7 +82,7 @@ struct drm_buddy {
>   	unsigned int n_roots;
>   	unsigned int max_order;
>   
> -	/* Must be at least PAGE_SIZE */
> +	/* Must be at least SZ_4K */
>   	u64 chunk_size;
>   	u64 size;
>   	u64 avail;