tree 052ec39f86482f4623531b247131aed93b6fb345
parent 165cd40235732644b1856a5ed5e158c9b93f6010
author Andy Whitcroft <[EMAIL PROTECTED]> Thu, 28 Jul 2005 01:44:02 -0700
committer Linus Torvalds <[EMAIL PROTECTED]> Thu, 28 Jul 2005 06:25:54 -0700
[PATCH] Remove bogus warning in page_alloc.c
Originally __free_pages_bulk used the relative page number within a zone to
define its buddies. This meant that to maintain the "maximally aligned"
requirements (that an allocation of size N will be aligned at least to N
physically) zones had to also be aligned to 1<<MAX_ORDER pages. When
__free_pages_bulk was updated to use the relative page frame numbers of the
free'd pages to pair buddies this released the alignment constraint on the
'left' edge of the zone. This allows _either_ edge of the zone to contain
partial MAX_ORDER sized buddies. These simply never will have matching
buddies and thus will never make it to the 'top' of the pyramid.
The patch below removes a now redundant check ensuring that the mem_map was
aligned to MAX_ORDER.
Signed-off-by: Andy Whitcroft <[EMAIL PROTECTED]>
Cc: Christoph Lameter <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
mm/page_alloc.c | 4 ----
1 files changed, 4 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1861,7 +1861,6 @@ static void __init free_area_init_core(s
unsigned long *zones_size, unsigned long *zholes_size)
{
unsigned long i, j;
- const unsigned long zone_required_alignment = 1UL << (MAX_ORDER-1);
int cpu, nid = pgdat->node_id;
unsigned long zone_start_pfn = pgdat->node_start_pfn;
@@ -1934,9 +1933,6 @@ static void __init free_area_init_core(s
zone->zone_mem_map = pfn_to_page(zone_start_pfn);
zone->zone_start_pfn = zone_start_pfn;
- if ((zone_start_pfn) & (zone_required_alignment-1))
- printk(KERN_CRIT "BUG: wrong zone alignment, it will
crash\n");
-
memmap_init(size, nid, j, zone_start_pfn);
zonetable_add(zone, nid, j, zone_start_pfn, size);
-
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