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authorTony Luck <tony.luck@intel.com>2015-11-10 21:09:47 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-11-11 01:44:26 +0300
commitb0aeba741b2d082e4f0773881af4906ce2bb8231 (patch)
tree54aa8f78967e60d869d4502ab4554aae4676d6b9 /mm
parent3934bbc0446e4cae977a6efe82ce993d37434e53 (diff)
downloadlinux-b0aeba741b2d082e4f0773881af4906ce2bb8231.tar.xz
Fix alloc_node_mem_map() to work on ia64 again
In commit a1c34a3bf00a ("mm: Don't offset memmap for flatmem") Laura fixed a problem for Srinivas relating to the bottom 2MB of RAM on an ARM IFC6410 board. One small wrinkle on ia64 is that it allocates the node_mem_map earlier in arch code, so it skips the block of code where "offset" is initialized. Move initialization of start and offset before the check for the node_mem_map so that they will always be available in the latter part of the function. Tested-by: Laura Abbott <laura@labbott.name> Fixes: a1c34a3bf00a (mm: Don't offset memmap for flatmem) Signed-off-by: Tony Luck <tony.luck@intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/page_alloc.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 208e4c7e771b..17a3c66639a9 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5266,6 +5266,7 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat)
static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat)
{
+ unsigned long __maybe_unused start = 0;
unsigned long __maybe_unused offset = 0;
/* Skip empty nodes */
@@ -5273,9 +5274,11 @@ static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat)
return;
#ifdef CONFIG_FLAT_NODE_MEM_MAP
+ start = pgdat->node_start_pfn & ~(MAX_ORDER_NR_PAGES - 1);
+ offset = pgdat->node_start_pfn - start;
/* ia64 gets its own node_mem_map, before this, without bootmem */
if (!pgdat->node_mem_map) {
- unsigned long size, start, end;
+ unsigned long size, end;
struct page *map;
/*
@@ -5283,8 +5286,6 @@ static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat)
* aligned but the node_mem_map endpoints must be in order
* for the buddy allocator to function correctly.
*/
- start = pgdat->node_start_pfn & ~(MAX_ORDER_NR_PAGES - 1);
- offset = pgdat->node_start_pfn - start;
end = pgdat_end_pfn(pgdat);
end = ALIGN(end, MAX_ORDER_NR_PAGES);
size = (end - start) * sizeof(struct page);