[PATCH v2 12/20] x86, mm, numa: Use numa_meminfo to check node_map_pfn alignment

Yinghai Lu
2013-03-10T06:47:17Z

We could use numa_meminfo directly instead of memblock nid.

So we could move down set memblock nid and only do it one time
for successful path.

-v2: according to tj, separate moving to another patch.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
arch/x86/mm/numa.c | 30 +++++++++++++++++++-----------
1 file changed, 19 insertions(+), 11 deletions(-)

diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index 24155b2..fcaeba9 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -496,14 +496,18 @@ static bool __init numa_meminfo_cover_memory(const struct numa_meminfo *mi)
* Returns the determined alignment in pfn's. 0 if there is no alignment
* requirement (single node).
*/
-unsigned long __init node_map_pfn_alignment(void)
+#ifdef NODE_NOT_IN_PAGE_FLAGS
+static unsigned long __init node_map_pfn_alignment(struct numa_meminfo *mi)
{
unsigned long accl_mask = 0, last_end = 0;
unsigned long start, end, mask;
int last_nid = -1;
int i, nid;

- for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, &nid) {
+ for (i = 0; i < mi->nr_blks; i++) {
+ start = mi->blk[i].start >> PAGE_SHIFT;
+ end = mi->blk[i].end >> PAGE_SHIFT;
+ nid = mi->blk[i].nid;
if (!start || last_nid < 0 || last_nid == nid) {
last_nid = nid;
last_end = end;
@@ -526,10 +530,16 @@ unsigned long __init node_map_pfn_alignment(void)
/* convert mask to number of pages */
return ~accl_mask + 1;
}
+#else
+static unsigned long __init node_map_pfn_alignment(struct numa_meminfo *mi)
+{
+ return 0;
+}
+#endif

static int __init numa_register_memblks(struct numa_meminfo *mi)
{
- unsigned long uninitialized_var(pfn_align);
+ unsigned long pfn_align;
int i;

/* Account for nodes with cpus and no memory */
@@ -541,24 +551,22 @@ static int __init numa_register_memblks(struct numa_meminfo *mi)
if (!numa_meminfo_cover_memory(mi))
return -EINVAL;

- for (i = 0; i < mi->nr_blks; i++) {
- struct numa_memblk *mb = &mi->blk[i];
- memblock_set_node(mb->start, mb->end - mb->start, mb->nid);
- }
-
/*
* If sections array is gonna be used for pfn -> nid mapping, check
* whether its granularity is fine enough.
*/
-#ifdef NODE_NOT_IN_PAGE_FLAGS
- pfn_align = node_map_pfn_alignment();
+ pfn_align = node_map_pfn_alignment(mi);
if (pfn_align && pfn_align < PAGES_PER_SECTION) {
printk(KERN_WARNING "Node alignment %LuMB < min %LuMB, rejecting NUMA config\n",
PFN_PHYS(pfn_align) >> 20,
PFN_PHYS(PAGES_PER_SECTION) >> 20);
return -EINVAL;
}
-#endif
+
+ for (i = 0; i < mi->nr_blks; i++) {
+ struct numa_memblk *mb = &mi->blk[i];
+ memblock_set_node(mb->start, mb->end - mb->start, mb->nid);
+ }

return 0;
}
--
1.7.10.4