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

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Date:	Sun, 24 Apr 2011 13:59:43 +1200
From:	Michael Schmitz <schmitzmic@...glemail.com>
To:	David Rientjes <rientjes@...gle.com>
CC:	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:
> 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 
> the node is brought online.
>
> 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.
>
> Signed-off-by: David Rientjes <rientjes@...gle.com>
> ---
>  arch/m68k/mm/init_mm.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
>
> diff --git a/arch/m68k/mm/init_mm.c b/arch/m68k/mm/init_mm.c
> --- a/arch/m68k/mm/init_mm.c
> +++ b/arch/m68k/mm/init_mm.c
> @@ -59,6 +59,8 @@ void __init m68k_setup_node(int node)
>  	}
>  #endif
>  	pg_data_map[node].bdata = bootmem_node_data + node;
> +	if (node_present_pages(node))
> +		node_set_state(node, N_NORMAL_MEMORY);
>  	node_set_online(node);
>  }
>  
>   
As Andreas pointed out, node_present_pages is set in free_area_init_node 
which only gets called at the very end of m68k mm paging_init.

The correct patch would be something like this - the need for the 
conditional is perhaps debatable, seeing as we set the pages present 
just before node_set_state.

Tested on my ARAnyM test setup so far. I'd like to wait for an 
independent kernel image built by Thorsten before I test on the actual 
hardware. Sorry but you'll have to restart your build Thorsten :-)

Signed-off-by: Michael Schmitz <schmitz@...ian.org>
--
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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