linux-kernel - [PATCH 08/12] mm: allocate section_map for sparse

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Date:	Wed, 19 Mar 2008 14:04:31 -0700
From:	Yinghai Lu <yhlu.kernel.send@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>
Cc:	Christoph Lameter <clameter@....com>,
	kernel list <linux-kernel@...r.kernel.org>
Subject: [PATCH 08/12] mm: allocate section_map for sparse_init

[PATCH] mm: allocate section_map for sparse_init

allocate section_map in bootmem instead of using __initdata.

need to apply after
	[PATCH] mm: fix boundary checking in free_bootmem_core
	[PATCH] mm: make mem_map allocation continuous.


Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>

Index: linux-2.6/mm/sparse.c
===================================================================
--- linux-2.6.orig/mm/sparse.c
+++ linux-2.6/mm/sparse.c
@@ -285,8 +285,6 @@ struct page __init *sparse_early_mem_map
 	return NULL;
 }
 
-/* section_map pointer array is 64k */
-static __initdata struct page *section_map[NR_MEM_SECTIONS];
 /*
  * Allocate the accumulated non-linear sections, allocate a mem_map
  * for each and record the physical to section mapping.
@@ -296,6 +294,9 @@ void __init sparse_init(void)
 	unsigned long pnum;
 	struct page *map;
 	unsigned long *usemap;
+	struct page **section_map;
+	int size;
+	int node;
 
 	/*
 	 * map is using big page (aka 2M in x86 64 bit)
@@ -305,13 +306,17 @@ void __init sparse_init(void)
 	 * then in big system, the memmory will have a lot hole...
 	 * here try to allocate 2M pages continously.
 	 */
+	size = sizeof(struct page *) * NR_MEM_SECTIONS;
+	section_map = alloc_bootmem(size);
+	if (!section_map)
+		panic("can not allocate section_map\n");
+
 	for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) {
 		if (!present_section_nr(pnum))
 			continue;
 		section_map[pnum] = sparse_early_mem_map_alloc(pnum);
 	}
 
-
 	for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) {
 		if (!present_section_nr(pnum))
 			continue;
@@ -327,6 +332,8 @@ void __init sparse_init(void)
 		sparse_init_one_section(__nr_to_section(pnum), pnum, map,
 								usemap);
 	}
+
+	free_bootmem(__pa(section_map), size);
 }
 
 #ifdef CONFIG_MEMORY_HOTPLUG
--
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