linux-kernel - Re: [PATCH v1 1/9] alpha: Convert mapping routine to rely on physical address

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Message-ID: <CA+=Fv5SzdR4=NXz68gRg0iXY-6Y=GRsO24UA-DF4tuyJ8r7w7Q@mail.gmail.com>
Date: Sun, 28 Sep 2025 19:35:43 +0200
From: Magnus Lindholm <linmag7@...il.com>
To: Leon Romanovsky <leon@...nel.org>
Cc: Marek Szyprowski <m.szyprowski@...sung.com>, Leon Romanovsky <leonro@...dia.com>, 
	Jason Gunthorpe <jgg@...dia.com>, Andreas Larsson <andreas@...sler.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, "David S. Miller" <davem@...emloft.net>, 
	Geoff Levand <geoff@...radead.org>, Helge Deller <deller@....de>, Ingo Molnar <mingo@...hat.com>, 
	iommu@...ts.linux.dev, 
	"James E.J. Bottomley" <James.Bottomley@...senpartnership.com>, Jason Wang <jasowang@...hat.com>, 
	Juergen Gross <jgross@...e.com>, linux-alpha@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org, 
	linuxppc-dev@...ts.ozlabs.org, Madhavan Srinivasan <maddy@...ux.ibm.com>, 
	Matt Turner <mattst88@...il.com>, Michael Ellerman <mpe@...erman.id.au>, 
	"Michael S. Tsirkin" <mst@...hat.com>, Richard Henderson <richard.henderson@...aro.org>, 
	sparclinux@...r.kernel.org, Stefano Stabellini <sstabellini@...nel.org>, 
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>, Thomas Gleixner <tglx@...utronix.de>, 
	virtualization@...ts.linux.dev, x86@...nel.org, 
	xen-devel@...ts.xenproject.org
Subject: Re: [PATCH v1 1/9] alpha: Convert mapping routine to rely on physical address

On Sun, Sep 28, 2025 at 5:02 PM Leon Romanovsky <leon@...nel.org> wrote:
>
> From: Leon Romanovsky <leonro@...dia.com>
>
> Alpha doesn't need struct *page and can perform mapping based on
> physical addresses. So convert it to implement new .map_phys callback.
>
> As part of this change, remove useless BUG_ON() as DMA mapping layer
> ensures that right direction is provided.

After the changes in v1 this runs fine on Alpha. I've tested this on an
ES40 Alphaserver during load (build kernel and unpack tar files).
The v1 patch fixes the errors seen in the first revision of this patch.

Tested-by: Magnus Lindholm <linmag7@...il.com>