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

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Message-ID: <20180704075410.GF22503@dhcp22.suse.cz>
Date:   Wed, 4 Jul 2018 09:54:10 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     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 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");
 	}
 
 	return __memblock_find_range_top_down(start, end, size, align, nid,
-- 
Michal Hocko
SUSE Labs