linux-kernel - Re: [PATCH v2, part3 01/12] mm: enhance free_reserved_area() to support poisoning memory with zero

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Message-ID: <CAMuHMdUbg67zLqn7x_vpzEWpbuwjmxO5MYRNJQhxMpqtLxTVOg@mail.gmail.com>
Date:	Sat, 16 Mar 2013 18:37:24 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Jiang Liu <liuj97@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Jiang Liu <jiang.liu@...wei.com>,
	Wen Congyang <wency@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>, Minchan Kim <minchan@...nel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Michal Hocko <mhocko@...e.cz>,
	Jianguo Wu <wujianguo@...wei.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2, part3 01/12] mm: enhance free_reserved_area() to
 support poisoning memory with zero

On Sat, Mar 16, 2013 at 6:03 PM, Jiang Liu <liuj97@...il.com> wrote:
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -5130,13 +5130,13 @@ unsigned long free_reserved_area(unsigned long start, unsigned long end,
>         pos = start = PAGE_ALIGN(start);
>         end &= PAGE_MASK;
>         for (pages = 0; pos < end; pos += PAGE_SIZE, pages++) {
> -               if (poison)
> +               if ((unsigned int)poison <= 0xFF)

"if (poison >= 0)"? No cast needed.

>                         memset((void *)pos, poison, PAGE_SIZE);

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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