[PATCH] x86-64: Reverse order of bootmem lists
This leads to bootmem allocating first from node 0 instead
of from the last node. This avoids swiotlb allocating on the last node, which
doesn't really work on a machine with >4GB.
Note: there is a better patch around from someone else that gets
rid of the pgdat list completely.
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/mm/bootmem.c b/mm/bootmem.c
index c1330cc..8ec4e4c 100644
--- a/mm/bootmem.c
+++ b/mm/bootmem.c
@@ -61,9 +61,17 @@
{
bootmem_data_t *bdata = pgdat->bdata;
unsigned long mapsize = ((end - start)+7)/8;
+ static struct pglist_data *pgdat_last;
- pgdat->pgdat_next = pgdat_list;
- pgdat_list = pgdat;
+ pgdat->pgdat_next = NULL;
+ /* Add new nodes last so that bootmem always starts
+ searching in the first nodes, not the last ones */
+ if (pgdat_last)
+ pgdat_last->pgdat_next = pgdat;
+ else {
+ pgdat_list = pgdat;
+ pgdat_last = pgdat;
+ }
mapsize = ALIGN(mapsize, sizeof(long));
bdata->node_bootmem_map = phys_to_virt(mapstart << PAGE_SHIFT);