linux-kernel - Re: [PATCH v2 3/3] m68k: switch to MEMBLOCK + NO

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Date:   Wed, 4 Jul 2018 10:21:45 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Greg Ungerer <gerg@...ux-m68k.org>,
        Sam Creasey <sammy@...my.net>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Linux MM <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/3] m68k: switch to MEMBLOCK + NO_BOOTMEM

Hi Michael,

On Wed, Jul 4, 2018 at 9:54 AM Michal Hocko <mhocko@...nel.org> wrote:
> On Wed 04-07-18 09:44:14, Geert Uytterhoeven wrote:
> [...]
> > ------------[ cut here ]------------
> > WARNING: CPU: 0 PID: 0 at mm/memblock.c:230
> > memblock_find_in_range_node+0x11c/0x1be
> > memblock: bottom-up allocation failed, memory hotunplug may be affected
>
> This only means that hotplugable memory might contain non-movable memory
> now. But does your system even support memory hotplug. I would be really

No it doesn't.

> surprised. So I guess we just want this instead
> diff --git a/mm/memblock.c b/mm/memblock.c
> index cc16d70b8333..c0dde95593fd 100644
> --- a/mm/memblock.c
> +++ b/mm/memblock.c
> @@ -228,7 +228,8 @@ phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t size,
>                  * so we use WARN_ONCE() here to see the stack trace if
>                  * fail happens.
>                  */
> -               WARN_ONCE(1, "memblock: bottom-up allocation failed, memory hotunplug may be affected\n");
> +               WARN_ONCE(IS_ENABLED(CONFIG_MEMORY_HOTREMOVE),
> +                                       "memblock: bottom-up allocvation failed, memory hotunplug may be affected\n");
>         }
>
>         return __memblock_find_range_top_down(start, end, size, align, nid,

Thanks, that does the trick!

Tested-by: Geert Uytterhoeven <geert@...ux-m68k.org>

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