linux-kernel - Re: [PATCH v1 05/11] mm: convert VM_PFNMAP tracking to pfnmap_track() + pfnmap

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Message-ID: <5c8809f0-c6f9-4151-b075-937f29c5db22@lucifer.local>
Date: Wed, 7 May 2025 15:27:36 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: David Hildenbrand <david@...hat.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org, x86@...nel.org,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-trace-kernel@...r.kernel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
        Borislav Petkov <bp@...en8.de>, "H. Peter Anvin" <hpa@...or.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tursulin@...ulin.net>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>,
        Vlastimil Babka <vbabka@...e.cz>, Jann Horn <jannh@...gle.com>,
        Pedro Falcato <pfalcato@...e.de>, Peter Xu <peterx@...hat.com>,
        Suren Baghdasaryan <surenb@...gle.com>
Subject: Re: [PATCH v1 05/11] mm: convert VM_PFNMAP tracking to
 pfnmap_track() + pfnmap_untrack()

On Wed, May 07, 2025 at 03:25:42PM +0200, David Hildenbrand wrote:
> > >
> > > Obviously my series will break this but should be _fairly_ trivial to
> > > update.
> > >
> > > You will however have to make sure to update tools/testing/vma/* to handle
> > > the new functions in userland testing (they need to be stubbed otu).
>
> Hmm, seems to compile. I guess, because we won't have
> "__HAVE_PFNMAP_TRACKING" defined in the test environment, so
> the existing stubs in there already seem to do the trick.
>
>
> +#else
> +static inline int vma_pfnmap_track_ctx_dup(struct vm_area_struct *orig,
> +              struct vm_area_struct *new)
> +{
> +      return 0;
>  }
> +static inline void vma_pfnmap_track_ctx_release(struct vm_area_struct *vma)
> +{
> +}
> +#endif
>

OK cool! Then we're good :>)

>
> --
> Cheers,
>
> David / dhildenb
>