This api is the preparation for further optimizing early_pfn_valid
Signed-off-by: Jia He <jia.he@xxxxxxxxxxxxxxxx>
---
include/linux/memblock.h | 2 ++
mm/memblock.c | 12 ++++++++++++
2 files changed, 14 insertions(+)
diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index 9471db4..5f46956 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -203,6 +203,8 @@ void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid))
#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
+int memblock_search_pfn_regions(unsigned long pfn);
+
unsigned long memblock_next_valid_pfn(unsigned long pfn, int *last_idx);
/**
* for_each_free_mem_range - iterate through free memblock areas
diff --git a/mm/memblock.c b/mm/memblock.c
index a9e8da4..f50fe5b 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -1659,6 +1659,18 @@ static int __init_memblock memblock_search(struct memblock_type *type, phys_addr
return -1;
}
+/* search memblock with the input pfn, return the region idx */
+int __init_memblock memblock_search_pfn_regions(unsigned long pfn)
+{
+ struct memblock_type *type = &memblock.memory;
+ int mid = memblock_search(type, PFN_PHYS(pfn));
+
+ if (mid == -1)
+ return -1;
+
+ return mid;
+}
+
bool __init memblock_is_reserved(phys_addr_t addr)
{
return memblock_search(&memblock.reserved, addr) != -1;
--
2.7.4
