Messages in this thread Patch in this message | | | Date | Fri, 09 Jul 2010 15:07:50 -0700 | From | Yinghai Lu <> | Subject | Re: unable to handle kernel paging request at 40000000 __alloc_memory_core_early+0x147/0x1d6 |
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On 07/09/2010 01:42 PM, Conny Seidel wrote: > sparse_early_mem_map_alloc: sparsemem memory map backing failed some memory will not be available.
please check
[PATCH -v2] x86,mm: fix 32bit numa sparsemem
Borislav Petkov <borislav.petkov@amd.com> reported his 32bit numa has problem:
[ 0.000000] Reserving total of 4c00 pages for numa KVA remap [ 0.000000] kva_start_pfn ~ 32800 max_low_pfn ~ 375fe [ 0.000000] max_pfn = 238000 [ 0.000000] 8202MB HIGHMEM available. [ 0.000000] 885MB LOWMEM available. [ 0.000000] mapped low ram: 0 - 375fe000 [ 0.000000] low ram: 0 - 375fe000 [ 0.000000] alloc (nid=8 100000 - 7ee00000) (1000000 - ffffffff) 1000 1000 => 34e7000 [ 0.000000] alloc (nid=8 100000 - 7ee00000) (1000000 - ffffffff) 200 40 => 34c9d80 [ 0.000000] alloc (nid=0 100000 - 7ee00000) (1000000 - ffffffffffffffff) 180 40 => 34e6140 [ 0.000000] alloc (nid=1 80000000 - c7e60000) (1000000 - ffffffffffffffff) 240 40 => 80000000 [ 0.000000] BUG: unable to handle kernel paging request at 40000000 [ 0.000000] IP: [<c2c8cff1>] __alloc_memory_core_early+0x147/0x1d6 [ 0.000000] *pdpt = 0000000000000000 *pde = f000ff53f000ff00 ... [ 0.000000] Call Trace: [ 0.000000] [<c2c8b4f8>] ? __alloc_bootmem_node+0x216/0x22f [ 0.000000] [<c2c90c9b>] ? sparse_early_usemaps_alloc_node+0x5a/0x10b [ 0.000000] [<c2c9149e>] ? sparse_init+0x1dc/0x499 [ 0.000000] [<c2c79118>] ? paging_init+0x168/0x1df [ 0.000000] [<c2c780ff>] ? native_pagetable_setup_start+0xef/0x1bb
looks like it allocate much high address for bootmem.
try to cut limit with get_max_mapped()
-v2: add fallback for sparse_mem_map_populate() for "sparse_early_mem_map_alloc: sparsemem memory map backing failed some memory will not be available."
Reported-by: Borislav Petkov <borislav.petkov@amd.com> Signed-off-by: Yinghai Lu <yinghai@kernel.org>
--- mm/page_alloc.c | 3 +++ mm/sparse.c | 10 +++++++++- 2 files changed, 12 insertions(+), 1 deletion(-)
Index: linux-2.6/mm/page_alloc.c =================================================================== --- linux-2.6.orig/mm/page_alloc.c +++ linux-2.6/mm/page_alloc.c @@ -3634,6 +3634,9 @@ void * __init __alloc_memory_core_early( int i; void *ptr; + if (limit > get_max_mapped()) + limit = get_max_mapped(); + /* need to go over early_node_map to find out good range for node */ for_each_active_range_index_in_nid(i, nid) { u64 addr; Index: linux-2.6/mm/sparse.c =================================================================== --- linux-2.6.orig/mm/sparse.c +++ linux-2.6/mm/sparse.c @@ -363,7 +363,10 @@ static void __init sparse_early_usemaps_ return; } - usemap = alloc_bootmem_node(NODE_DATA(nodeid), size * usemap_count); + usemap = __alloc_bootmem_node_nopanic(NODE_DATA(nodeid), + size * usemap_count, + SMP_CACHE_BYTES, + __pa(MAX_DMA_ADDRESS)); if (usemap) { for (pnum = pnum_begin; pnum < pnum_end; pnum++) { if (!present_section_nr(pnum)) @@ -391,6 +394,11 @@ struct page __init *sparse_mem_map_popul size = PAGE_ALIGN(sizeof(struct page) * PAGES_PER_SECTION); map = __alloc_bootmem_node_high(NODE_DATA(nid), size, PAGE_SIZE, __pa(MAX_DMA_ADDRESS)); + + if (!map) + map = __alloc_bootmem_node_nopanic(NODE_DATA(nid), size, + PAGE_SIZE, __pa(MAX_DMA_ADDRESS)); + return map; } void __init sparse_mem_maps_populate_node(struct page **map_map,
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