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

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Date:   Wed, 20 Jul 2022 22:21:17 +0900
From:   Stafford Horne <shorne@...il.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Arnd Bergmann <arnd@...db.de>, 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 07:32:46AM -0700, Christoph Hellwig wrote:
> On Tue, Jul 19, 2022 at 10:05:46PM +0900, Stafford Horne wrote:
> > > > Or we could try to keep the generic definition in a global header
> > > > like linux/isa-dma.h.
> > > 
> > > Perhaps option 3 makes the whole patch the most clean.
> > 
> > And this is the result, I will get this into the series and create a v4 tomorrow
> > if no issues.
> 
> Yes, this is what I tried to suggest earlier and it looks fine to me.
> If we want to overengineer it we could add a ISA_DMA_BRIDGE_BUGGY
> Kconfig symbol and select it from x86.

I left it as X86_32, I feel it it would be more confusing/hard to maintain to
add the extra level of indirection.

-Stafford