linux-kernel - Re: [PATCH v3 02/12] m68k: Pass a pointer to virt_to_pfn() virt_to

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Date:   Wed, 24 May 2023 12:10:36 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Vineet Gupta <vgupta@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Russell King <linux@...linux.org.uk>,
        Greg Ungerer <gerg@...ux-m68k.org>, linux-mm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        linux-snps-arc@...ts.infradead.org, linux-fsdevel@...r.kernel.org,
        linux-cifs@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-arch@...r.kernel.org
Subject: Re: [PATCH v3 02/12] m68k: Pass a pointer to virt_to_pfn() virt_to_page()

Hi Linus,

On Tue, May 23, 2023 at 4:05 PM Linus Walleij <linus.walleij@...aro.org> wrote:
> Functions that work on a pointer to virtual memory such as
> virt_to_pfn() and users of that function such as
> virt_to_page() are supposed to pass a pointer to virtual
> memory, ideally a (void *) or other pointer. However since
> many architectures implement virt_to_pfn() as a macro,
> this function becomes polymorphic and accepts both a
> (unsigned long) and a (void *).
>
> Fix up the offending calls in arch/m68k with explicit casts.
>
> The page table include <asm/pgtable.h> will include different
> variants of the defines depending on whether you build for
> classic m68k, ColdFire or Sun3, so fix all variants.
>
> Tested-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> Signed-off-by: Linus Walleij <linus.walleij@...aro.org>

Thanks for your patch!

> ---
> ChangeLog v2->v3:
> - Fix up versioning. This is v3.
> - Let Coldfire __pte_page() return a (void *) instead of __va
> - Delete Coldfire pte_pagenr() which was using unsigned long
>   semantics from __pte_page()

You may want to mention this removal in the patch descriptin.

> - Drop ill-advised change to Coldfire pmd_page_vaddr()

> --- a/arch/m68k/include/asm/sun3_pgtable.h
> +++ b/arch/m68k/include/asm/sun3_pgtable.h

> @@ -111,7 +111,7 @@ static inline void pte_clear (struct mm_struct *mm, unsigned long addr, pte_t *p
>
>  #define pte_page(pte)          virt_to_page(__pte_page(pte))
>  #define pmd_pfn(pmd)           (pmd_val(pmd) >> PAGE_SHIFT)
> -#define pmd_page(pmd)          virt_to_page(pmd_page_vaddr(pmd))
> +#define pmd_page(pmd)          virt_to_page((void  *)pmd_page_vaddr(pmd))

There's an extra space between "void" and "*".

Reviewed-by: Geert Uytterhoeven <geert@...ux-m68k.org>
Acked-by: Geert Uytterhoeven <geert@...ux-m68k.org>

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