linux-kernel - Re: [patch] m68k, mm: set all online nodes in N_NORMAL

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Message-ID: <4DB63349.3070808@gmail.com>
Date:	Tue, 26 Apr 2011 14:51:53 +1200
From:	Michael Schmitz <schmitzmic@...glemail.com>
To:	David Rientjes <rientjes@...gle.com>
CC:	Michael Schmitz <schmitzmic@...glemail.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Roman Zippel <zippel@...ux-m68k.org>,
	linux-m68k@...r.kernel.org, linux-kernel@...r.kernel.org,
	schwab@...ux-m68k.org,
	"tg@...bsd.de >> Thorsten Glaser" <tg@...bsd.de>
Subject: Re: [patch] m68k, mm: set all online nodes in N_NORMAL_MEMORY

David Rientjes wrote:
> Ok, would you like to write a changelog for this similar to mine and then 
> propose it as an alternative?
>
> Thanks!
>   
Will this one do?

Cheers,

  Michael


commit 99b9c43cfb18a8e2222e9ef80b04a5c3e1dad254
Author: Michael Schmitz <schmitz@...ian.org>
Date:   Tue Apr 26 14:51:54 2011 +1200

[m68k]      For m68k, N_NORMAL_MEMORY represents all nodes that have 
present memory
        since it does not support HIGHMEM.  This patch sets the bit at 
the time
        node_present_pages has been set by free_area_init_node.
        At the time the node is brought online, the the node state would 
have to
        be done unconditionally since information about present memory 
has not yet
        been recorded.
              
        If N_NORMAL_MEMORY is not accurate, slub may encounter errors 
since it
        uses this nodemask to setup per-cache kmem_cache_node data 
structures.

         This pach is an alternative to the one proposed by David 
Rientjes <rientjes@...gle.com>
         attempting to set node state immediately when bringing the node 
online.

Signed-off-by: Michael Schmitz <schmitz@...ian.org>
---
 arch/m68k/mm/motorola.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/m68k/mm/motorola.c b/arch/m68k/mm/motorola.c
index 02b7a03..b806c19 100644
--- a/arch/m68k/mm/motorola.c
+++ b/arch/m68k/mm/motorola.c
@@ -300,6 +300,8 @@ void __init paging_init(void)
                zones_size[ZONE_DMA] = m68k_memory[i].size >> PAGE_SHIFT;
                free_area_init_node(i, zones_size,
                                    m68k_memory[i].addr >> PAGE_SHIFT, 
NULL);
+                if (node_present_pages(i))
+                        node_set_state(i, N_NORMAL_MEMORY);
        }
 }

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