Re: [PATCH v4 4/5] dma: swiotlb: Add an overridable architecture pool opt-out

[Catalin Marinas]

On Mon, Sep 14, 2026 at 12:31:33PM +0530, Aneesh Kumar K.V (Arm) wrote:
> diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
> index be3962a33fc6..ef7a776ee508 100644
> --- a/include/linux/swiotlb.h
> +++ b/include/linux/swiotlb.h
> @@ -20,6 +20,8 @@ struct scatterlist;
>  #define SWIOTLB_INIT_ADDRESSING_LIMIT	(1 << 2)
>  /* Initialize a default-sized pool that requires architecture remapping. */
>  #define SWIOTLB_INIT_REMAP		(1 << 3)
> +/* Do not initialize a pool unless SWIOTLB is explicitly required. */
> +#define SWIOTLB_INIT_FORCE_DISABLE	(1 << 4)

Nit: maybe better as SWIOTLB_INIT_DEFAULT_OFF. "Force" sounds too
drastic and it can be overridden on the command line to re-enable.

Reviewed-by: Catalin Marinas <catalin.marinas@xxxxxxx>