On (18/12/07 13:03), Thomas Bogendoerfer didst pronounce:
> When using FLAT_MEMORY and ARCH_PFN_OFFSET is not 0, the kernel
> crashes in memmap_init_zone(). This bug got introduced by
> commit c713216deebd95d2b0ab38fef8bb2361c0180c2d
>
That commit is over a year old and it initially distressed me that it
would take this long to show up on a boot test. However, you said this was
to fix MIPS in a follow-on mail and I never made it use arch-independent
zone-sizing which is where CONFIG_ARCH_POPULATES_NODE_MAP comes from. Support
for arch-independent zone-sizing was added for MIPS on Nov 3rd 2007 by commit
cce335ae47e231398269fb05fa48e0e9cbf289e0 (relevant cc added) which is a much
more reasonable timeframe for catching this sort of problem. I believe the
real bug might be in there.
Can you post a full dmesg log with loglevel=8 so I can see what the layout
looks like? My aim is to find out why the start of your mem_map is not at
the start of node 0's mem_map which is what I generally expected with the
FLATMEM model.
Thanks.
> Signed-off-by: Thomas Bogendoerfer <[email protected]>
> ---
>
> mm/page_alloc.c | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index b5a58d4..496f7f3 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -3427,7 +3427,7 @@ static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat)
> mem_map = NODE_DATA(0)->node_mem_map;
> #ifdef CONFIG_ARCH_POPULATES_NODE_MAP
> if (page_to_pfn(mem_map) != pgdat->node_start_pfn)
> - mem_map -= pgdat->node_start_pfn;
> + mem_map -= (pgdat->node_start_pfn - ARCH_PFN_OFFSET);
> #endif /* CONFIG_ARCH_POPULATES_NODE_MAP */
> }
> #endif
>
--
Mel Gorman
Part-time Phd Student Linux Technology Center
University of Limerick IBM Dublin Software Lab
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