[PATCH] x86-64: x86_64-make-the-numa-hash-function-nodemap-allocation fix fix

- 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 <ak@suse.de>
Cc: Rohit Seth <rohitseth@google.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Andi Kleen <ak@suse.de>

1 files changed, 8 insertions, 7 deletions

diff --git a/arch/x86_64/mm/numa.c b/arch/x86_64/mm/numa.c
index 7d9c428f4094..1ec16ea97519 100644
--- a/arch/x86_64/mm/numa.c
+++ b/arch/x86_64/mm/numa.c
@@ -78,11 +78,8 @@ static int __init allocate_cachealigned_memnodemap(void)
         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_memnodemap(void)
 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 bootnode *nodes, int numnodes)
                 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;
 }