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From:   Jia He <hejianet@gmail.com>
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Subject: [PATCH 2/4] mm/memblock: introduce memblock_search_pfn_regions()
Date:   Wed, 21 Mar 2018 01:09:54 -0700
Message-Id: <1521619796-3846-3-git-send-email-hejianet@gmail.com>
In-Reply-To: <1521619796-3846-1-git-send-email-hejianet@gmail.com>
References: <1521619796-3846-1-git-send-email-hejianet@gmail.com>
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This api is the preparation for further optimizing early_pfn_valid

Signed-off-by: Jia He <jia.he@hxt-semitech.com>
---
 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