linux-kernel - Re: [PATCH 4/5] mm: Provide page mask in struct follow_pfnmap

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Message-ID: <20250217145606.22b95d9b.alex.williamson@redhat.com>
Date: Mon, 17 Feb 2025 14:56:06 -0700
From: Alex Williamson <alex.williamson@...hat.com>
To: David Hildenbrand <david@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, peterx@...hat.com,
 mitchell.augustin@...onical.com, clg@...hat.com, akpm@...ux-foundation.org,
 linux-mm@...ck.org
Subject: Re: [PATCH 4/5] mm: Provide page mask in struct follow_pfnmap_args

On Fri, 14 Feb 2025 22:39:30 +0100
David Hildenbrand <david@...hat.com> wrote:

> On 14.02.25 18:17, Alex Williamson wrote:
> > 
> > Nudge.  Peter Xu provided an R-b for the series.  Would any other mm
> > folks like to chime in here to provide objection or approval for this
> > change and merging it through the vfio tree?  Series[1].  Thanks!
> >   
> 
> Only skimmed over it, nothing jumped at me except ...
> 
> Nitpicking:
> 
> I was wondering if "page mask" really the right term here. I know that 
> we use it in some context (gup, hugetlb, zeropage) to express "mask this 
> off and you get the start of the aligned huge page".
> 
> For something that walks PFNMAPs (page frames without any real "huge 
> page" logical metadata etc. grouping) it was uintuitive for me at first.
> 
> addr_mask or pfn_mask (shifted addr_mask) would have been clearer for me.
> 
> No strong opinion, just what came to mind while reading this ...

It's called addr_mask in pfnmap_args_setup() so I'm happy to keep that
naming if pgmask is less intuitive.  Thanks,

Alex