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From: Jia He <hejianet@gmail.com>
Subject: [PATCH v10 4/6] mm/memblock: introduce memblock_search_pfn_regions()
Date: Fri,  6 Jul 2018 16:14:18 +0800
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To: Russell King <linux@armlinux.org.uk>, Andrew Morton <akpm@linux-foundation.org>, Michal Hocko <mhocko@suse.com>, Catalin Marinas <catalin.marinas@arm.com>, Mel Gorman <mgorman@suse.de>, Will Deacon <will.deacon@arm.com>, Mark Rutland <mark.rutland@arm.com>, "H. Peter Anvin" <hpa@zytor.com>
Cc: Pavel Tatashin <pasha.tatashin@oracle.com>, Daniel Jordan <daniel.m.jordan@oracle.com>, AKASHI Takahiro <takahiro.akashi@linaro.org>, Gioh Kim <gi-oh.kim@profitbricks.com>, Steven Sistare <steven.sistare@oracle.com>, Daniel Vacek <neelx@redhat.com>, Eugeniu Rosca <erosca@de.adit-jv.com>, Vlastimil Babka <vbabka@suse.cz>, linux-kernel@vger.kernel.org, linux-mm@kvack.org, James Morse <james.morse@arm.com>, Ard Biesheuvel <ard.biesheuvel@linaro.org>, Steve Capper <steve.capper@arm.com>, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Kate Stewart <kstewart@linuxfoundation.org>, Philippe Ombredanne <pombredanne@nexb.com>, Johannes Weiner <hannes@cmpxchg.org>, Kemi Wang <kemi.wang@intel.com>, Petr Tesarik <ptesarik@suse.com>, YASUAKI ISHIMATSU <yasu.isimatu@gmail.com>, Andrey Ryabinin <aryabinin@virtuozzo.com>, Nikolay Borisov <nborisov@suse.com>, richard.weiyang@gmail.com, Jia He <hejianet@gmail.com>, Jia He <jia.he@hxt-semitech.com>

This helper is to find the memory region index of input pfn.

Signed-off-by: Jia He <jia.he@hxt-semitech.com>
---
 include/linux/memblock.h | 2 ++
 mm/memblock.c            | 9 +++++++++
 2 files changed, 11 insertions(+)

diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index ca59883..b0f0307 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);
+
 /**
  * for_each_free_mem_range - iterate through free memblock areas
  * @i: u64 used as loop variable
diff --git a/mm/memblock.c b/mm/memblock.c
index 84f7fa7..c783b1a 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -1676,6 +1676,15 @@ 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));
+
+	return mid;
+}
+
 bool __init memblock_is_reserved(phys_addr_t addr)
 {
 	return memblock_search(&memblock.reserved, addr) != -1;
-- 
1.8.3.1