[PATCH 1/9] alpha: Convert mapping routine to rely on physical address

[Leon Romanovsky]

On Mon, Sep 22, 2025 at 11:04:06PM +0200, Magnus Lindholm wrote:
> On Thu, Sep 18, 2025 at 8:45 PM Leon Romanovsky <leon at kernel.org> wrote:
> >
> > From: Leon Romanovsky <leonro at nvidia.com>
> >
> > Alpha doesn't need struct *page and can perform mapping based on
> > physical addresses. So convert it to implement new .map_phys callback.
> 
> 
> Hi,
> 
> SInce this patch affects the Alpha platform I got curious and decided to
> try it out. The patch series requires some preparatory patches. Leon
> provided me with links to his dmabuf-vfio branch, which had the
> patches (and some prerequisite stuff) applied already.
> 
> Based on the dmabuf-vfio branch,  I've built a kernel and tested it on
> my ES40 Alphaserver, the kernel booted fine but after a while of
> moderate filesystem load I started seeing some ext3/4 related error
> messages in the system logs. Rebooting with my old kernel into
> single user mode, I was able to recover the filesystem using fsck.
> Clearly this set of patches breaks things (at least on Alpha).

I will try to setup Alpha architecture in QEMU in following days, but
would like to ask first. Did you test alpha on clean v6.17-rc5 (without
my patches) as a reference?

Thanks