linux-kernel - Re: [PATCH 12/15] mm, dax, gpu: convert vm_insert_mixed to __pfn_t, introduce _PAGE

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Date:	Wed, 23 Sep 2015 15:47:26 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Hansen <dave@...1.net>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
	David Airlie <airlied@...ux.ie>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux MM <linux-mm@...ck.org>,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH 12/15] mm, dax, gpu: convert vm_insert_mixed to __pfn_t,
 introduce _PAGE_DEVMAP

Hi Dan,

On Wed, Sep 23, 2015 at 6:42 AM, Dan Williams <dan.j.williams@...el.com> wrote:
> Convert the raw unsigned long 'pfn' argument to __pfn_t for the purpose of
> evaluating the PFN_MAP and PFN_DEV flags.  When both are set the it

s/the it/it/

> triggers _PAGE_DEVMAP to be set in the resulting pte.  This flag will
> later be used in the get_user_pages() path to pin the page mapping,
> dynamically allocated by devm_memremap_pages(), until all the resulting
> pages are released.
>
> There are no functional changes to the gpu drivers as a result of this
> conversion.
>
> This uncovered several architectures with no local definition for
> pfn_pte(), in response __pfn_t_pte() is only defined when an arch
> opts-in by "#define pfn_pte pfn_pte".
>
> Cc: Dave Hansen <dave@...1.net>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: David Airlie <airlied@...ux.ie>
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>

> diff --git a/arch/m68k/include/asm/page_no.h b/arch/m68k/include/asm/page_no.h
> index ef209169579a..930a42f6db44 100644
> --- a/arch/m68k/include/asm/page_no.h
> +++ b/arch/m68k/include/asm/page_no.h
> @@ -34,6 +34,7 @@ extern unsigned long memory_end;
>
>  #define        virt_addr_valid(kaddr)  (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \
>                                 ((void *)(kaddr) < (void *)memory_end))
> +#define __pfn_to_phys(pfn)     PFN_PHYS(pfn)

The above change doesn't match the patch description?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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