linux-kernel - Re: [PATCH v4 0/4] mm: kmemleak: store objects allocated with physical address separately and check when scan

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Message-ID: <CAMuHMdXRwVVYXK+SrVMt_FQe4KPQfozERQzYqweEYUvy4BuWRA@mail.gmail.com>
Date:   Tue, 12 Jul 2022 15:43:32 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Patrick Wang <patrick.wang.shcn@...il.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux MM <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        yee.lee@...iatek.com,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCH v4 0/4] mm: kmemleak: store objects allocated with
 physical address separately and check when scan

Hi Patrick,

On Sat, Jun 11, 2022 at 8:50 AM Patrick Wang
<patrick.wang.shcn@...il.com> wrote:
> The kmemleak_*_phys() interface uses "min_low_pfn" and
> "max_low_pfn" to check address. But on some architectures,
> kmemleak_*_phys() is called before those two variables
> initialized. The following steps will be taken:
>
> 1) Add OBJECT_PHYS flag and rbtree for the objects allocated
>    with physical address
> 2) Store physical address in objects if allocated with OBJECT_PHYS
> 3) Check the boundary when scan instead of in kmemleak_*_phys()

Thanks for your series!

> This patch set will solve:
> https://lore.kernel.org/r/20220527032504.30341-1-yee.lee@mediatek.com
> https://lore.kernel.org/r/9dd08bb5-f39e-53d8-f88d-bec598a08c93@gmail.com

Thanks, this finally gets rid of the thousands of suspected memory
leaks reported since commit 23c2d497de21f258 ("mm: kmemleak: take
a full lowmem check in kmemleak_*_phys()") in v5.18-rc3 on my arm64
boards.

Tested-by: Geert Uytterhoeven <geert+renesas@...der.be>

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