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-rw-r--r--mm/page_alloc.c40
1 files changed, 25 insertions, 15 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index c2ee4ecad083..ffdb2308848d 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4551,39 +4551,41 @@ int __meminit init_currently_empty_zone(struct zone *zone,
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
#ifndef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
+
/*
* Required by SPARSEMEM. Given a PFN, return what node the PFN is on.
*/
-int __meminit __early_pfn_to_nid(unsigned long pfn)
+int __meminit __early_pfn_to_nid(unsigned long pfn,
+ struct mminit_pfnnid_cache *state)
{
unsigned long start_pfn, end_pfn;
int nid;
- /*
- * NOTE: The following SMP-unsafe globals are only used early in boot
- * when the kernel is running single-threaded.
- */
- static unsigned long __meminitdata last_start_pfn, last_end_pfn;
- static int __meminitdata last_nid;
- if (last_start_pfn <= pfn && pfn < last_end_pfn)
- return last_nid;
+ if (state->last_start <= pfn && pfn < state->last_end)
+ return state->last_nid;
nid = memblock_search_pfn_nid(pfn, &start_pfn, &end_pfn);
if (nid != -1) {
- last_start_pfn = start_pfn;
- last_end_pfn = end_pfn;
- last_nid = nid;
+ state->last_start = start_pfn;
+ state->last_end = end_pfn;
+ state->last_nid = nid;
}
return nid;
}
#endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */
+static struct mminit_pfnnid_cache early_pfnnid_cache __meminitdata;
+
+/* Only safe to use early in boot when initialisation is single-threaded */
int __meminit early_pfn_to_nid(unsigned long pfn)
{
int nid;
- nid = __early_pfn_to_nid(pfn);
+ /* The system will behave unpredictably otherwise */
+ BUG_ON(system_state != SYSTEM_BOOTING);
+
+ nid = __early_pfn_to_nid(pfn, &early_pfnnid_cache);
if (nid >= 0)
return nid;
/* just returns 0 */
@@ -4591,15 +4593,23 @@ int __meminit early_pfn_to_nid(unsigned long pfn)
}
#ifdef CONFIG_NODES_SPAN_OTHER_NODES
-bool __meminit early_pfn_in_nid(unsigned long pfn, int node)
+bool __meminit meminit_pfn_in_nid(unsigned long pfn, int node,
+ struct mminit_pfnnid_cache *state)
{
int nid;
- nid = __early_pfn_to_nid(pfn);
+ nid = __early_pfn_to_nid(pfn, state);
if (nid >= 0 && nid != node)
return false;
return true;
}
+
+/* Only safe to use early in boot when initialisation is single-threaded */
+bool __meminit early_pfn_in_nid(unsigned long pfn, int node)
+{
+ return meminit_pfn_in_nid(pfn, node, &early_pfnnid_cache);
+}
+
#endif
/**