linux-kernel - Re: [PATCH v2 2/2] asm-generic: Add new pci.h and use it

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Date:   Tue, 19 Jul 2022 09:45:58 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Stafford Horne <shorne@...il.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Christoph Hellwig <hch@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Guo Ren <guoren@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Johannes Berg <johannes@...solutions.net>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-csky@...r.kernel.org,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        linux-um <linux-um@...ts.infradead.org>,
        linux-pci <linux-pci@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] asm-generic: Add new pci.h and use it

On Tue, Jul 19, 2022 at 1:19 AM Stafford Horne <shorne@...il.com> wrote:
> On Mon, Jul 18, 2022, 3:56 PM Arnd Bergmann <arnd@...db.de> wrote:
>>
>> As mentioned before, it would be even better to just remove it
>> entirely from everything except x86, and enclose the four
>> references in an explicit "#ifdef X86_32". The variable declaration
>> only exists because drivers/pci/quirks.c is compiled on all
>> architecture, but the individual quirk is only active  based on
>> the PCI device ID of certain early PCI-ISA bridges.
>
>
> Ok, I was thinking of that route but once I saw the pci device IDs I
> wasn't so sure it was limited to x86.  I'll go ahead with that approach.

Ok, thanks!

I checked all the PCI IDs yesterday, and I'm fairly sure they are x86
specific. While some related products are general-purpose PCI-ISA
bridges that have shown up on mips or arm boards, the ones listed
here should all be safe.

         Arnd