linux-kernel - Re: [PATCH v2] kfifo: don't include dma-mapping.h in kfifo.h

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Message-ID: <33b28b0a-b19d-459a-8db4-678df60cd799@kernel.org>
Date: Wed, 23 Oct 2024 08:30:36 +0200
From: Jiri Slaby <jirislaby@...nel.org>
To: Christoph Hellwig <hch@....de>, jassisinghbrar@...il.com, afd@...com
Cc: stefani@...bold.net, gregkh@...uxfoundation.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] kfifo: don't include dma-mapping.h in kfifo.h

On 23. 10. 24, 7:53, Christoph Hellwig wrote:
> Nothing in kfifo.h directly needs dma-mapping.h, only two macros
> use DMA_MAPPING_ERROR when actually instantiated.  Drop the
> dma-mapping.h include to reduce include bloat.
> 
> Add an explicity <linux/io.h> include to drivers/mailbox/omap-mailbox.c
> as that file uses __raw_readl and __raw_writel through a complicated
> include chain involving <linux/dma-mapping.h>
> 
> Fixes: d52b761e4b1a ("kfifo: add kfifo_dma_out_prepare_mapped()")
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
> 
> Changes since v1:
>   - improve the commit log
> 
>   drivers/mailbox/omap-mailbox.c | 1 +
>   include/linux/kfifo.h          | 1 -
>   samples/kfifo/dma-example.c    | 1 +
>   3 files changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mailbox/omap-mailbox.c b/drivers/mailbox/omap-mailbox.c
> index 6797770474a5..680243751d62 100644
> --- a/drivers/mailbox/omap-mailbox.c
> +++ b/drivers/mailbox/omap-mailbox.c
> @@ -15,6 +15,7 @@
>   #include <linux/slab.h>
>   #include <linux/kfifo.h>

Funnily enough, this driver does not use kfifo since:
commit 3f58c1f4206f37d0af4595a9046c76016334b301
Author: Andrew Davis <afd@...com>
Date:   Wed Apr 10 08:59:42 2024 -0500

     mailbox: omap: Remove kernel FIFO message queuing

>   #include <linux/err.h>
> +#include <linux/io.h>

So this should have been revealed at that point (while removing kfifo.h 
in that commit too).

Perhaps Andrew can remove the include now?

thanks,
-- 
js
suse labs