Re: unable to handle kernel paging request at 40000000 __alloc_memory_core_early+0x147/0x1d6

[Yinghai Lu]

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@xxxxxxx> 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@xxxxxxx>
Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>

---
 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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