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Commit 70210ed9 authored by Philipp Hachtmann's avatar Philipp Hachtmann Committed by Martin Schwidefsky
Browse files

mm/memblock: add physical memory list 



Add the physmem list to the memblock structure. This list only exists
if HAVE_MEMBLOCK_PHYS_MAP is selected and contains the unmodified
list of physically available memory. It differs from the memblock
memory list as it always contains all memory ranges even if the
memory has been restricted, e.g. by use of the mem= kernel parameter.

Signed-off-by: default avatarPhilipp Hachtmann <phacht@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent f1af9d3a

include/linux/memblock.h

+4 −0
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ 
#include <linux/mm.h>



#define INIT_MEMBLOCK_REGIONS	128

#define INIT_PHYSMEM_REGIONS	4



/* Definition of memblock flags. */

#define MEMBLOCK_HOTPLUG	0x1	/* hotpluggable region */
@@ -43,6 +44,9 @@ struct memblock { 
	phys_addr_t current_limit;

	struct memblock_type memory;

	struct memblock_type reserved;

#ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP

	struct memblock_type physmem;

#endif

};



extern struct memblock memblock;

mm/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -134,6 +134,9 @@ config HAVE_MEMBLOCK 
config HAVE_MEMBLOCK_NODE_MAP

	boolean



config HAVE_MEMBLOCK_PHYS_MAP

	boolean



config ARCH_DISCARD_MEMBLOCK

	boolean

mm/memblock.c

+12 −0
Original line number Diff line number Diff line
@@ -27,6 +27,9 @@ 


static struct memblock_region memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock;

static struct memblock_region memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock;

#ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP

static struct memblock_region memblock_physmem_init_regions[INIT_PHYSMEM_REGIONS] __initdata_memblock;

#endif



struct memblock memblock __initdata_memblock = {

	.memory.regions		= memblock_memory_init_regions,
@@ -37,6 +40,12 @@ struct memblock memblock __initdata_memblock = { 
	.reserved.cnt		= 1,	/* empty dummy entry */

	.reserved.max		= INIT_MEMBLOCK_REGIONS,



#ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP

	.physmem.regions	= memblock_physmem_init_regions,

	.physmem.cnt		= 1,	/* empty dummy entry */

	.physmem.max		= INIT_PHYSMEM_REGIONS,

#endif



	.bottom_up		= false,

	.current_limit		= MEMBLOCK_ALLOC_ANYWHERE,

};
@@ -1553,6 +1562,9 @@ static int __init memblock_init_debugfs(void) 
		return -ENXIO;

	debugfs_create_file("memory", S_IRUGO, root, &memblock.memory, &memblock_debug_fops);

	debugfs_create_file("reserved", S_IRUGO, root, &memblock.reserved, &memblock_debug_fops);

#ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP

	debugfs_create_file("physmem", S_IRUGO, root, &memblock.physmem, &memblock_debug_fops);

#endif



	return 0;

}