linux-kernel - [External] [RFC PATCH v1 2/6] mm/page_alloc.c: get pfn range with flags of memblock

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Date:   Tue, 8 May 2018 02:32:47 +0000
From:   Huaisheng HS1 Ye <yehs1@...ovo.com>
To:     "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>
CC:     "mhocko@...e.com" <mhocko@...e.com>,
        "willy@...radead.org" <willy@...radead.org>,
        "vbabka@...e.cz" <vbabka@...e.cz>,
        "mgorman@...hsingularity.net" <mgorman@...hsingularity.net>,
        "pasha.tatashin@...cle.com" <pasha.tatashin@...cle.com>,
        "alexander.levin@...izon.com" <alexander.levin@...izon.com>,
        "hannes@...xchg.org" <hannes@...xchg.org>,
        "penguin-kernel@...ove.SAKURA.ne.jp" 
        <penguin-kernel@...ove.SAKURA.ne.jp>,
        "colyli@...e.de" <colyli@...e.de>,
        NingTing Cheng <chengnt@...ovo.com>,
        "Ocean HY1 He" <hehy1@...ovo.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>
Subject: [External]  [RFC PATCH v1 2/6] mm/page_alloc.c: get pfn range with
 flags of memblock

This is used to expand the interface of get_pfn_range_for_nid with
flags of memblock, so mm can get pfn range with special flags.

Signed-off-by: Huaisheng Ye <yehs1@...ovo.com>
Signed-off-by: Ocean He <hehy1@...ovo.com>
---
 include/linux/mm.h |  4 ++++
 mm/page_alloc.c    | 17 ++++++++++++++++-
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index ad06d42..8abf9c9 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2046,6 +2046,10 @@ extern unsigned long absent_pages_in_range(unsigned long start_pfn,
 						unsigned long end_pfn);
 extern void get_pfn_range_for_nid(unsigned int nid,
 			unsigned long *start_pfn, unsigned long *end_pfn);
+extern void get_pfn_range_for_nid_with_flags(unsigned int nid,
+					     unsigned long *start_pfn,
+					     unsigned long *end_pfn,
+					     unsigned long flags);
 extern unsigned long find_min_pfn_with_active_regions(void);
 extern void free_bootmem_with_active_regions(int nid,
 						unsigned long max_low_pfn);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 1741dd2..266c065 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5705,13 +5705,28 @@ void __init sparse_memory_present_with_active_regions(int nid)
 void __meminit get_pfn_range_for_nid(unsigned int nid,
 			unsigned long *start_pfn, unsigned long *end_pfn)
 {
+	get_pfn_range_for_nid_with_flags(nid, start_pfn, end_pfn,
+					 MEMBLOCK_MAX_TYPE);
+}
+
+/*
+ * If MAX_NUMNODES, includes all node memmory regions.
+ * If MEMBLOCK_MAX_TYPE, includes all memory regions with or without Flags.
+ */
+
+void __meminit get_pfn_range_for_nid_with_flags(unsigned int nid,
+						unsigned long *start_pfn,
+						unsigned long *end_pfn,
+						unsigned long flags)
+{
 	unsigned long this_start_pfn, this_end_pfn;
 	int i;
 
 	*start_pfn = -1UL;
 	*end_pfn = 0;
 
-	for_each_mem_pfn_range(i, nid, &this_start_pfn, &this_end_pfn, NULL) {
+	for_each_mem_pfn_range_with_flags(i, nid, &this_start_pfn,
+					  &this_end_pfn, NULL, flags) {
 		*start_pfn = min(*start_pfn, this_start_pfn);
 		*end_pfn = max(*end_pfn, this_end_pfn);
 	}
-- 
1.8.3.1