mm: meminit: initialise a subset of struct pages if CONFIG_DEFERRED_STRUCT_PAGE_INIT...

[firefly-linux-kernel-4.4.55.git] / mm / internal.h

diff --git a/mm/internal.h b/mm/internal.h
index 58e9022e37570c43a5069fb4ecf8aabfe827928e..88ac7be741ca5459f8d7d1e951a7b0177fb213d3 100644 (file)
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -387,6 +387,24 @@ static inline void mminit_verify_zonelist(void)
 }
 #endif /* CONFIG_DEBUG_MEMORY_INIT */
 
+/*
+ * Deferred struct page initialisation requires init functions that are freed
+ * before kswapd is available. Reuse the memory hotplug section annotation
+ * to mark the required code.
+ *
+ * __defermem_init is code that always exists but is annotated __meminit to
+ *     avoid section warnings.
+ * __defer_init code gets marked __meminit when deferring struct page
+ *     initialistion but is otherwise in the init section.
+ */
+#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
+#define __defermem_init __meminit
+#define __defer_init    __meminit
+#else
+#define __defermem_init
+#define __defer_init __init
+#endif
+
 /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
 #if defined(CONFIG_SPARSEMEM)
 extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,