linux-kernel - Re: provide generic page_to_phys and phys_to

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Message-Id: <c9f10ee9-697f-4f45-8c82-a6dc61e5a74e@app.fastmail.com>
Date: Fri, 25 Oct 2024 13:37:15 +0000
From: "Arnd Bergmann" <arnd@...db.de>
To: "Christoph Hellwig" <hch@....de>
Cc: linux-alpha@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-snps-arc@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org,
 "linux-csky@...r.kernel.org" <linux-csky@...r.kernel.org>,
 linux-hexagon@...r.kernel.org, loongarch@...ts.linux.dev,
 linux-m68k@...ts.linux-m68k.org, linux-mips@...r.kernel.org,
 "linux-openrisc@...r.kernel.org" <linux-openrisc@...r.kernel.org>,
 linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
 linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
 linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
 linux-um@...ts.infradead.org, Linux-Arch <linux-arch@...r.kernel.org>
Subject: Re: provide generic page_to_phys and phys_to_page implementations v3

On Wed, Oct 23, 2024, at 05:36, Christoph Hellwig wrote:
> page_to_phys is duplicated by all architectures, and from some strange
> reason placed in <asm/io.h> where it doesn't fit at all.  
>
> phys_to_page is only provided by a few architectures despite having a lot 
> of open coded users.
>
> Provide generic versions in <asm-generic/memory_model.h> to make these
> helpers more easily usable.
>

I've applied this to the asm-generic tree now.

Thanks for the cleanup!

     Arnd