x86_64-make-the-numa-hash-function-nodemap-allocation fix fix From: Amul Shah - Removed an extraneous debug message from allocate_cachealigned_map - Changed extract_lsb_from_nodes to return 63 for the case where there was only one memory node. The prevents the creation of the dynamic hashmap. - Changed extract_lsb_from_nodes to use only the starting memory address of a node. On an ES7000, our nodes overlap the starting and ending address, meaning, that we see nodes like 00000 - 10000 10000 - 20000 But other systems have nodes whose start and end addresses do not overlap. For example: 00000 - 0FFFF 10000 - 1FFFF In this case, using the ending address will result in an LSB much lower than what is possible. In this case an LSB of 1 when in reality it should be 16. Cc: Andi Kleen Cc: Rohit Seth Signed-off-by: Andrew Morton Signed-off-by: Andi Kleen --- arch/x86_64/mm/numa.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) Index: linux/arch/x86_64/mm/numa.c =================================================================== --- linux.orig/arch/x86_64/mm/numa.c +++ linux/arch/x86_64/mm/numa.c @@ -78,11 +78,8 @@ static int __init allocate_cachealigned_ unsigned long pad, pad_addr; memnodemap = memnode.embedded_map; - if (memnodemapsize <= 48) { - printk(KERN_DEBUG "NUMA: Allocated memnodemap from %lx - %lx\n", - nodemap_addr, nodemap_addr + nodemap_size); + if (memnodemapsize <= 48) return 0; - } pad = L1_CACHE_BYTES - 1; pad_addr = 0x8000; @@ -110,7 +107,7 @@ static int __init allocate_cachealigned_ static int __init extract_lsb_from_nodes (const struct bootnode *nodes, int numnodes) { - int i; + int i, nodes_used = 0; unsigned long start, end; unsigned long bitfield = 0, memtop = 0; @@ -119,11 +116,15 @@ extract_lsb_from_nodes (const struct boo end = nodes[i].end; if (start >= end) continue; - bitfield |= start | end; + bitfield |= start; + nodes_used++; if (end > memtop) memtop = end; } - i = find_first_bit(&bitfield, sizeof(unsigned long)*8); + if (nodes_used <= 1 ) + i = 63; + else + i = find_first_bit(&bitfield, sizeof(unsigned long)*8); memnodemapsize = (memtop >> i)+1; return i; }