Commit 5d3d0f77 authored by Andi Kleen's avatar Andi Kleen Committed by Linus Torvalds
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[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: default avatarAndi Kleen <>
Signed-off-by: default avatarLinus Torvalds <>
parent 6142891a
......@@ -61,9 +61,17 @@ static unsigned long __init init_bootmem_core (pg_data_t *pgdat,
bootmem_data_t *bdata = pgdat->bdata;
unsigned long mapsize = ((end - start)+7)/8;
pgdat->pgdat_next = pgdat_list;
pgdat_list = pgdat;
static struct pglist_data *pgdat_last;
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);
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