path: root/mm/sparse.c
diff options
authorYinghai Lu <yinghai@kernel.org>2012-07-11 14:02:53 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-07-11 16:04:49 -0700
commit99ab7b19440a72ebdf225f99b20f8ef40decee86 (patch)
tree74ac6a77d44e5ee0657456c1335ec74edd5c3d0e /mm/sparse.c
parent07b4e2bc9c35ea88cbd36d806fcd5e3bcbf022be (diff)
mm: sparse: fix usemap allocation above node descriptor section
After commit f5bf18fa22f8 ("bootmem/sparsemem: remove limit constraint in alloc_bootmem_section"), usemap allocations may easily be placed outside the optimal section that holds the node descriptor, even if there is space available in that section. This results in unnecessary hotplug dependencies that need to have the node unplugged before the section holding the usemap. The reason is that the bootmem allocator doesn't guarantee a linear search starting from the passed allocation goal but may start out at a much higher address absent an upper limit. Fix this by trying the allocation with the limit at the section end, then retry without if that fails. This keeps the fix from f5bf18fa22f8 of not panicking if the allocation does not fit in the section, but still makes sure to try to stay within the section at first. Signed-off-by: Yinghai Lu <yinghai@kernel.org> Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Cc: <stable@vger.kernel.org> [3.3.x, 3.4.x] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/sparse.c')
1 files changed, 13 insertions, 5 deletions
diff --git a/mm/sparse.c b/mm/sparse.c
index e861397016a..c7bb952400c 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -275,8 +275,9 @@ static unsigned long * __init
sparse_early_usemaps_alloc_pgdat_section(struct pglist_data *pgdat,
unsigned long size)
- pg_data_t *host_pgdat;
- unsigned long goal;
+ unsigned long goal, limit;
+ unsigned long *p;
+ int nid;
* A page may contain usemaps for other sections preventing the
* page being freed and making a section unremovable while
@@ -288,9 +289,16 @@ sparse_early_usemaps_alloc_pgdat_section(struct pglist_data *pgdat,
* this problem.
goal = __pa(pgdat) & (PAGE_SECTION_MASK << PAGE_SHIFT);
- host_pgdat = NODE_DATA(early_pfn_to_nid(goal >> PAGE_SHIFT));
- return __alloc_bootmem_node_nopanic(host_pgdat, size,
+ limit = goal + (1UL << PA_SECTION_SHIFT);
+ nid = early_pfn_to_nid(goal >> PAGE_SHIFT);
+ p = ___alloc_bootmem_node_nopanic(NODE_DATA(nid), size,
+ SMP_CACHE_BYTES, goal, limit);
+ if (!p && limit) {
+ limit = 0;
+ goto again;
+ }
+ return p;
static void __init check_usemap_section_nr(int nid, unsigned long *usemap)