linux-kernel - [PATCH v5 3/5] mm/sparse: move buffer init/fini to the common place

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Date:   Thu, 12 Jul 2018 16:37:28 -0400
From:   Pavel Tatashin <pasha.tatashin@...cle.com>
To:     steven.sistare@...cle.com, daniel.m.jordan@...cle.com,
        linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        kirill.shutemov@...ux.intel.com, mhocko@...e.com,
        linux-mm@...ck.org, dan.j.williams@...el.com, jack@...e.cz,
        jglisse@...hat.com, jrdr.linux@...il.com, bhe@...hat.com,
        gregkh@...uxfoundation.org, vbabka@...e.cz,
        richard.weiyang@...il.com, dave.hansen@...el.com,
        rientjes@...gle.com, mingo@...nel.org,
        osalvador@...hadventures.net, pasha.tatashin@...cle.com,
        abdhalee@...ux.vnet.ibm.com, mpe@...erman.id.au
Subject: [PATCH v5 3/5] mm/sparse: move buffer init/fini to the common place

Now, that both variants of sparse memory use the same buffers to populate
memory map, we can move sparse_buffer_init()/sparse_buffer_fini() to the
common place.

Signed-off-by: Pavel Tatashin <pasha.tatashin@...cle.com>
---
 include/linux/mm.h  |  3 ---
 mm/sparse-vmemmap.c |  2 --
 mm/sparse.c         | 14 +++++++-------
 3 files changed, 7 insertions(+), 12 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index a83d3e0e66d4..99d8c50adef6 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2655,9 +2655,6 @@ void sparse_mem_maps_populate_node(struct page **map_map,
 				   unsigned long map_count,
 				   int nodeid);
 
-unsigned long __init section_map_size(void);
-void sparse_buffer_init(unsigned long size, int nid);
-void sparse_buffer_fini(void);
 void *sparse_buffer_alloc(unsigned long size);
 struct page *sparse_mem_map_populate(unsigned long pnum, int nid,
 		struct vmem_altmap *altmap);
diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c
index b05c7663c640..cd15f3d252c3 100644
--- a/mm/sparse-vmemmap.c
+++ b/mm/sparse-vmemmap.c
@@ -270,7 +270,6 @@ void __init sparse_mem_maps_populate_node(struct page **map_map,
 	unsigned long pnum;
 	int nr_consumed_maps = 0;
 
-	sparse_buffer_init(section_map_size() * map_count, nodeid);
 	for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
 		if (!present_section_nr(pnum))
 			continue;
@@ -282,5 +281,4 @@ void __init sparse_mem_maps_populate_node(struct page **map_map,
 		pr_err("%s: sparsemem memory map backing failed some memory will not be available\n",
 		       __func__);
 	}
-	sparse_buffer_fini();
 }
diff --git a/mm/sparse.c b/mm/sparse.c
index 976854a3af8b..01c616342909 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -401,14 +401,14 @@ static void __init sparse_early_usemaps_alloc_node(void *data,
 }
 
 #ifdef CONFIG_SPARSEMEM_VMEMMAP
-unsigned long __init section_map_size(void)
+static unsigned long __init section_map_size(void)
 
 {
 	return ALIGN(sizeof(struct page) * PAGES_PER_SECTION, PMD_SIZE);
 }
 
 #else
-unsigned long __init section_map_size(void)
+static unsigned long __init section_map_size(void)
 {
 	return PAGE_ALIGN(sizeof(struct page) * PAGES_PER_SECTION);
 }
@@ -433,10 +433,8 @@ void __init sparse_mem_maps_populate_node(struct page **map_map,
 					  unsigned long map_count, int nodeid)
 {
 	unsigned long pnum;
-	unsigned long size = section_map_size();
 	int nr_consumed_maps = 0;
 
-	sparse_buffer_init(size * map_count, nodeid);
 	for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
 		if (!present_section_nr(pnum))
 			continue;
@@ -447,14 +445,13 @@ void __init sparse_mem_maps_populate_node(struct page **map_map,
 		pr_err("%s: sparsemem memory map backing failed some memory will not be available\n",
 		       __func__);
 	}
-	sparse_buffer_fini();
 }
 #endif /* !CONFIG_SPARSEMEM_VMEMMAP */
 
 static void *sparsemap_buf __meminitdata;
 static void *sparsemap_buf_end __meminitdata;
 
-void __init sparse_buffer_init(unsigned long size, int nid)
+static void __init sparse_buffer_init(unsigned long size, int nid)
 {
 	BUG_ON(sparsemap_buf);
 	sparsemap_buf =
@@ -464,7 +461,7 @@ void __init sparse_buffer_init(unsigned long size, int nid)
 	sparsemap_buf_end = sparsemap_buf + size;
 }
 
-void __init sparse_buffer_fini(void)
+static void __init sparse_buffer_fini(void)
 {
 	unsigned long size = sparsemap_buf_end - sparsemap_buf;
 
@@ -494,8 +491,11 @@ static void __init sparse_early_mem_maps_alloc_node(void *data,
 				 unsigned long map_count, int nodeid)
 {
 	struct page **map_map = (struct page **)data;
+
+	sparse_buffer_init(section_map_size() * map_count, nodeid);
 	sparse_mem_maps_populate_node(map_map, pnum_begin, pnum_end,
 					 map_count, nodeid);
+	sparse_buffer_fini();
 }
 #else
 static struct page __init *sparse_early_mem_map_alloc(unsigned long pnum)
-- 
2.18.0