linux-kernel - Re: [PATCH 19/34] m68k: handle pgtable_page

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Message-ID: <CAMuHMdUqQVphjUbvPg+47ZjFmS8WUK_70VMb43w4jaBOcGfNxA@mail.gmail.com>
Date:	Wed, 16 Oct 2013 10:07:52 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux MM <linux-mm@...ck.org>,
	Linux-Arch <linux-arch@...r.kernel.org>,
	"Linux/m68k" <linux-m68k@...r.kernel.org>
Subject: Re: [PATCH 19/34] m68k: handle pgtable_page_ctor() fail

On Thu, Oct 10, 2013 at 8:05 PM, Kirill A. Shutemov
<kirill.shutemov@...ux.intel.com> wrote:
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
> ---
>  arch/m68k/include/asm/motorola_pgalloc.h | 5 ++++-
>  arch/m68k/include/asm/sun3_pgalloc.h     | 5 ++++-
>  2 files changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/arch/m68k/include/asm/motorola_pgalloc.h b/arch/m68k/include/asm/motorola_pgalloc.h
> index 2f02f264e6..dd254eeb03 100644
> --- a/arch/m68k/include/asm/motorola_pgalloc.h
> +++ b/arch/m68k/include/asm/motorola_pgalloc.h
> @@ -40,7 +40,10 @@ static inline pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long addres
>         flush_tlb_kernel_page(pte);
>         nocache_page(pte);
        ^^^^^^^^^^^^^^^^^^
>         kunmap(page);
> -       pgtable_page_ctor(page);
> +       if (!pgtable_page_ctor(page)) {
> +               __free_page(page);

Shouldn't you mark the page cacheable again, like is done in pte_free()?

> +               return NULL;
> +       }
>         return page;
>  }
>
> diff --git a/arch/m68k/include/asm/sun3_pgalloc.h b/arch/m68k/include/asm/sun3_pgalloc.h
> index 48d80d5a66..f868506e33 100644
> --- a/arch/m68k/include/asm/sun3_pgalloc.h
> +++ b/arch/m68k/include/asm/sun3_pgalloc.h
> @@ -59,7 +59,10 @@ static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
>                 return NULL;
>
>         clear_highpage(page);
> -       pgtable_page_ctor(page);
> +       if (!pgtable_page_ctor(page)) {
> +               __free_page(page);
> +               return NULL;
> +       }
>         return page;

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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