linux-kernel - Re: [PATCH] mm: Remove the BOUNCE config option

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Message-ID: <934d3de7-0f46-494a-831f-d04209ea4a8f@arm.com>
Date: Wed, 15 Oct 2025 09:12:34 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: Huacai Chen <chenhuacai@...ngson.cn>, Huacai Chen
 <chenhuacai@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org, Christoph Hellwig <hch@....de>,
 Jens Axboe <axboe@...nel.dk>, Hannes Reinecke <hare@...e.de>,
 John Garry <john.g.garry@...cle.com>,
 Johannes Thumshirn <johannes.thumshirn@....com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: Remove the BOUNCE config option



On 13/10/25 3:26 PM, Huacai Chen wrote:
> Commit eeadd68e2a5f6bfe0bf10 ("block: remove bounce buffering support")
> remove block/bounce.c but left the BOUNCE config option. Now this option
> has no users, so remove it.
> 
> Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
> ---
>  mm/Kconfig | 9 ---------
>  1 file changed, 9 deletions(-)
> 
> diff --git a/mm/Kconfig b/mm/Kconfig
> index 0e26f4fc8717..e47321051d76 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -695,15 +695,6 @@ config PCP_BATCH_SCALE_MAX
>  config PHYS_ADDR_T_64BIT
>  	def_bool 64BIT
>  
> -config BOUNCE
> -	bool "Enable bounce buffers"
> -	default y
> -	depends on BLOCK && MMU && HIGHMEM
> -	help
> -	  Enable bounce buffers for devices that cannot access the full range of
> -	  memory available to the CPU. Enabled by default when HIGHMEM is
> -	  selected, but you may say n to override this.
> -
>  config MMU_NOTIFIER
>  	bool
>  	select INTERVAL_TREE

Reviewed-by: Anshuman Khandual <anshuman.khandual@....com>