Re: [PATCH v3 02/12] m68k: Pass a pointer to virt_to_pfn() virt_to_page()

From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Linus Walleij <linus.walleij@linaro.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Vineet Gupta <vgupta@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
	Russell King <linux@armlinux.org.uk>,
	Greg Ungerer <gerg@linux-m68k.org>,
	linux-mm@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-m68k@lists.linux-m68k.org,
	linux-snps-arc@lists.infradead.org,
	linux-fsdevel@vger.kernel.org, linux-cifs@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, linux-arch@vger.kernel.org
Subject: Re: [PATCH v3 02/12] m68k: Pass a pointer to virt_to_pfn() virt_to_page()
Date: Wed, 24 May 2023 12:10:36 +0200	[thread overview]
Message-ID: <CAMuHMdXafb3SYUgu=ZWFRSiqGdt5ahvPEa75v6jGPBPGARaBhw@mail.gmail.com> (raw)
In-Reply-To: <20230503-virt-to-pfn-v6-4-rc1-v3-2-a16c19c03583@linaro.org>

Hi Linus,

On Tue, May 23, 2023 at 4:05 PM Linus Walleij <linus.walleij@linaro.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@linux-m68k.org>
> Signed-off-by: Linus Walleij <linus.walleij@linaro.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@linux-m68k.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-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