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

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Date:   Wed, 4 Jul 2018 14:22:00 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Michal Hocko <mhocko@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.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

On 07/04/2018 09:54 AM, Michal Hocko 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
> 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");
                                                             ^ allocation               ^ hotremove
Makes sense, though.

>  	}
>  
>  	return __memblock_find_range_top_down(start, end, size, align, nid,
>