linux-kernel - Re: [PATCH] mm: skip reserved page for kmem leak scanning

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Message-ID: <CAGWkznH=Gwr_TDF3=fv+_ZH5P4QN6JXEAtH4DAzNus20pHxyeg@mail.gmail.com>
Date:   Fri, 26 Aug 2022 11:23:27 +0800
From:   Zhaoyang Huang <huangzhaoyang@...il.com>
To:     "zhaoyang.huang" <zhaoyang.huang@...soc.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        "open list:MEMORY MANAGEMENT" <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>, Ke Wang <ke.wang@...soc.com>
Subject: Re: [PATCH] mm: skip reserved page for kmem leak scanning

On Fri, Aug 26, 2022 at 11:13 AM zhaoyang.huang
<zhaoyang.huang@...soc.com> wrote:
>
> From: Zhaoyang Huang <zhaoyang.huang@...soc.com>
>
> It is no need to scan reserved page, skip it.
>
> Signed-off-by: Zhaoyang Huang <zhaoyang.huang@...soc.com>
> ---
>  mm/kmemleak.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/kmemleak.c b/mm/kmemleak.c
> index a182f5d..c546250 100644
> --- a/mm/kmemleak.c
> +++ b/mm/kmemleak.c
> @@ -1471,7 +1471,7 @@ static void kmemleak_scan(void)
>                         if (page_zone(page) != zone)
>                                 continue;
>                         /* only scan if page is in use */
> -                       if (page_count(page) == 0)
> +                       if (page_count(page) == 0 || PageReserved(page))
Sorry for previous stupid code by my faint, correct it here
>                                 continue;
>                         scan_block(page, page + 1, NULL);
>                         if (!(pfn & 63))
> --
> 1.9.1
>