memblock: Introduce for_each_memblock() and new accessors
Walk memblock's using for_each_memblock() and use memblock_region_base/end_pfn() for
getting to PFNs.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index 47bceb1..c914112 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -64,6 +64,7 @@
extern void memblock_dump_all(void);
+/* Obsolete accessors */
static inline u64
memblock_size_bytes(struct memblock_type *type, unsigned long region_nr)
{
@@ -86,6 +87,57 @@
memblock_size_pages(type, region_nr);
}
+/*
+ * pfn conversion functions
+ *
+ * While the memory MEMBLOCKs should always be page aligned, the reserved
+ * MEMBLOCKs may not be. This accessor attempt to provide a very clear
+ * idea of what they return for such non aligned MEMBLOCKs.
+ */
+
+/**
+ * memblock_region_base_pfn - Return the lowest pfn intersecting with the region
+ * @reg: memblock_region structure
+ */
+static inline unsigned long memblock_region_base_pfn(const struct memblock_region *reg)
+{
+ return reg->base >> PAGE_SHIFT;
+}
+
+/**
+ * memblock_region_last_pfn - Return the highest pfn intersecting with the region
+ * @reg: memblock_region structure
+ */
+static inline unsigned long memblock_region_last_pfn(const struct memblock_region *reg)
+{
+ return (reg->base + reg->size - 1) >> PAGE_SHIFT;
+}
+
+/**
+ * memblock_region_end_pfn - Return the pfn of the first page following the region
+ * but not intersecting it
+ * @reg: memblock_region structure
+ */
+static inline unsigned long memblock_region_end_pfn(const struct memblock_region *reg)
+{
+ return memblock_region_last_pfn(reg) + 1;
+}
+
+/**
+ * memblock_region_pages - Return the number of pages covering a region
+ * @reg: memblock_region structure
+ */
+static inline unsigned long memblock_region_pages(const struct memblock_region *reg)
+{
+ return memblock_region_end_pfn(reg) - memblock_region_end_pfn(reg);
+}
+
+#define for_each_memblock(memblock_type, region) \
+ for (region = memblock.memblock_type.regions; \
+ region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \
+ region++)
+
+
#endif /* __KERNEL__ */
#endif /* _LINUX_MEMBLOCK_H */