[linux-2.6-block.git] / arch / arm64 / mm / init.c

/*
 * Based on arch/arm/mm/init.c
 *
 * Copyright (C) 1995-2005 Russell King
 * Copyright (C) 2012 ARM Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/errno.h>
#include <linux/swap.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/mman.h>
#include <linux/nodemask.h>
#include <linux/initrd.h>
#include <linux/gfp.h>
#include <linux/memblock.h>
#include <linux/sort.h>
#include <linux/of_fdt.h>

#include <asm/prom.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/sizes.h>
#include <asm/tlb.h>

#include "mm.h"

static unsigned long phys_initrd_start __initdata = 0;
static unsigned long phys_initrd_size __initdata = 0;

phys_addr_t memstart_addr __read_mostly = 0;

void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
{
	phys_initrd_start = start;
	phys_initrd_size = end - start;
}

static int __init early_initrd(char *p)
{
	unsigned long start, size;
	char *endp;

	start = memparse(p, &endp);
	if (*endp == ',') {
		size = memparse(endp + 1, NULL);

		phys_initrd_start = start;
		phys_initrd_size = size;
	}
	return 0;
}
early_param("initrd", early_initrd);

#define MAX_DMA32_PFN ((4UL * 1024 * 1024 * 1024) >> PAGE_SHIFT)

static void __init zone_sizes_init(unsigned long min, unsigned long max)
{
	struct memblock_region *reg;
	unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
	unsigned long max_dma32 = min;

	memset(zone_size, 0, sizeof(zone_size));

#ifdef CONFIG_ZONE_DMA32
	/* 4GB maximum for 32-bit only capable devices */
	max_dma32 = max(min, min(max, MAX_DMA32_PFN));
	zone_size[ZONE_DMA32] = max_dma32 - min;
#endif
	zone_size[ZONE_NORMAL] = max - max_dma32;

	memcpy(zhole_size, zone_size, sizeof(zhole_size));

	for_each_memblock(memory, reg) {
		unsigned long start = memblock_region_memory_base_pfn(reg);
		unsigned long end = memblock_region_memory_end_pfn(reg);

		if (start >= max)
			continue;
#ifdef CONFIG_ZONE_DMA32
		if (start < max_dma32) {
			unsigned long dma_end = min(end, max_dma32);
			zhole_size[ZONE_DMA32] -= dma_end - start;
		}
#endif
		if (end > max_dma32) {
			unsigned long normal_end = min(end, max);
			unsigned long normal_start = max(start, max_dma32);
			zhole_size[ZONE_NORMAL] -= normal_end - normal_start;
		}
	}

	free_area_init_node(0, zone_size, min, zhole_size);
}

#ifdef CONFIG_HAVE_ARCH_PFN_VALID
int pfn_valid(unsigned long pfn)
{
	return memblock_is_memory(pfn << PAGE_SHIFT);
}
EXPORT_SYMBOL(pfn_valid);
#endif

#ifndef CONFIG_SPARSEMEM
static void arm64_memory_present(void)
{
}
#else
static void arm64_memory_present(void)
{
	struct memblock_region *reg;

	for_each_memblock(memory, reg)
		memory_present(0, memblock_region_memory_base_pfn(reg),
			       memblock_region_memory_end_pfn(reg));
}
#endif

void __init arm64_memblock_init(void)
{
	u64 *reserve_map, base, size;

	/* Register the kernel text, kernel data and initrd with memblock */
	memblock_reserve(__pa(_text), _end - _text);
#ifdef CONFIG_BLK_DEV_INITRD
	if (phys_initrd_size) {
		memblock_reserve(phys_initrd_start, phys_initrd_size);

		/* Now convert initrd to virtual addresses */
		initrd_start = __phys_to_virt(phys_initrd_start);
		initrd_end = initrd_start + phys_initrd_size;
	}
#endif

	/*
	 * Reserve the page tables.  These are already in use,
	 * and can only be in node 0.
	 */
	memblock_reserve(__pa(swapper_pg_dir), SWAPPER_DIR_SIZE);
	memblock_reserve(__pa(idmap_pg_dir), IDMAP_DIR_SIZE);

	/* Reserve the dtb region */
	memblock_reserve(virt_to_phys(initial_boot_params),
			 be32_to_cpu(initial_boot_params->totalsize));

	/*
	 * Process the reserve map.  This will probably overlap the initrd
	 * and dtb locations which are already reserved, but overlapping
	 * doesn't hurt anything
	 */
	reserve_map = ((void*)initial_boot_params) +
			be32_to_cpu(initial_boot_params->off_mem_rsvmap);
	while (1) {
		base = be64_to_cpup(reserve_map++);
		size = be64_to_cpup(reserve_map++);
		if (!size)
			break;
		memblock_reserve(base, size);
	}

	memblock_allow_resize();
	memblock_dump_all();
}

void __init bootmem_init(void)
{
	unsigned long min, max;

	min = PFN_UP(memblock_start_of_DRAM());
	max = PFN_DOWN(memblock_end_of_DRAM());

	/*
	 * Sparsemem tries to allocate bootmem in memory_present(), so must be
	 * done after the fixed reservations.
	 */
	arm64_memory_present();

	sparse_init();
	zone_sizes_init(min, max);

	high_memory = __va((max << PAGE_SHIFT) - 1) + 1;
	max_pfn = max_low_pfn = max;
}

#ifndef CONFIG_SPARSEMEM_VMEMMAP
static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
{
	struct page *start_pg, *end_pg;
	unsigned long pg, pgend;

	/*
	 * Convert start_pfn/end_pfn to a struct page pointer.
	 */
	start_pg = pfn_to_page(start_pfn - 1) + 1;
	end_pg = pfn_to_page(end_pfn - 1) + 1;

	/*
	 * Convert to physical addresses, and round start upwards and end
	 * downwards.
	 */
	pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
	pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;

	/*
	 * If there are free pages between these, free the section of the
	 * memmap array.
	 */
	if (pg < pgend)
		free_bootmem(pg, pgend - pg);
}

/*
 * The mem_map array can get very big. Free the unused area of the memory map.
 */
static void __init free_unused_memmap(void)
{
	unsigned long start, prev_end = 0;
	struct memblock_region *reg;

	for_each_memblock(memory, reg) {
		start = __phys_to_pfn(reg->base);

#ifdef CONFIG_SPARSEMEM
		/*
		 * Take care not to free memmap entries that don't exist due
		 * to SPARSEMEM sections which aren't present.
		 */
		start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
#endif
		/*
		 * If we had a previous bank, and there is a space between the
		 * current bank and the previous, free it.
		 */
		if (prev_end && prev_end < start)
			free_memmap(prev_end, start);

		/*
		 * Align up here since the VM subsystem insists that the
		 * memmap entries are valid from the bank end aligned to
		 * MAX_ORDER_NR_PAGES.
		 */
		prev_end = ALIGN(start + __phys_to_pfn(reg->size),
				 MAX_ORDER_NR_PAGES);
	}

#ifdef CONFIG_SPARSEMEM
	if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
		free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
#endif
}
#endif	/* !CONFIG_SPARSEMEM_VMEMMAP */

/*
 * mem_init() marks the free areas in the mem_map and tells us how much memory
 * is free.  This is done after various parts of the system have claimed their
 * memory after the kernel image.
 */
void __init mem_init(void)
{
	arm64_swiotlb_init();

	max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;

#ifndef CONFIG_SPARSEMEM_VMEMMAP
	free_unused_memmap();
#endif
	/* this will put all unused low memory onto the freelists */
	free_all_bootmem();

	mem_init_print_info(NULL);

#define MLK(b, t) b, t, ((t) - (b)) >> 10
#define MLM(b, t) b, t, ((t) - (b)) >> 20
#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)

	pr_notice("Virtual kernel memory layout:\n"
		  "    vmalloc : 0x%16lx - 0x%16lx   (%6ld MB)\n"
#ifdef CONFIG_SPARSEMEM_VMEMMAP
		  "    vmemmap : 0x%16lx - 0x%16lx   (%6ld MB)\n"
#endif
		  "    modules : 0x%16lx - 0x%16lx   (%6ld MB)\n"
		  "    memory  : 0x%16lx - 0x%16lx   (%6ld MB)\n"
		  "      .init : 0x%p" " - 0x%p" "   (%6ld kB)\n"
		  "      .text : 0x%p" " - 0x%p" "   (%6ld kB)\n"
		  "      .data : 0x%p" " - 0x%p" "   (%6ld kB)\n",
		  MLM(VMALLOC_START, VMALLOC_END),
#ifdef CONFIG_SPARSEMEM_VMEMMAP
		  MLM((unsigned long)virt_to_page(PAGE_OFFSET),
		      (unsigned long)virt_to_page(high_memory)),
#endif
		  MLM(MODULES_VADDR, MODULES_END),
		  MLM(PAGE_OFFSET, (unsigned long)high_memory),

		  MLK_ROUNDUP(__init_begin, __init_end),
		  MLK_ROUNDUP(_text, _etext),
		  MLK_ROUNDUP(_sdata, _edata));

#undef MLK
#undef MLM
#undef MLK_ROUNDUP

	/*
	 * Check boundaries twice: Some fundamental inconsistencies can be
	 * detected at build time already.
	 */
#ifdef CONFIG_COMPAT
	BUILD_BUG_ON(TASK_SIZE_32			> TASK_SIZE_64);
#endif
	BUILD_BUG_ON(TASK_SIZE_64			> MODULES_VADDR);
	BUG_ON(TASK_SIZE_64				> MODULES_VADDR);

	if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
		extern int sysctl_overcommit_memory;
		/*
		 * On a machine this small we won't get anywhere without
		 * overcommit, so turn it on by default.
		 */
		sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
	}
}

void free_initmem(void)
{
	free_initmem_default(0);
}

#ifdef CONFIG_BLK_DEV_INITRD

static int keep_initrd;

void free_initrd_mem(unsigned long start, unsigned long end)
{
	if (!keep_initrd)
		free_reserved_area((void *)start, (void *)end, 0, "initrd");
}

static int __init keepinitrd_setup(char *__unused)
{
	keep_initrd = 1;
	return 1;
}

__setup("keepinitrd", keepinitrd_setup);
#endif
Commit	Line	Data
c1cc1552 CM	1	/*
	2	* Based on arch/arm/mm/init.c
	3	*
	4	* Copyright (C) 1995-2005 Russell King
	5	* Copyright (C) 2012 ARM Ltd.
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	18	*/
	19
	20	#include <linux/kernel.h>
	21	#include <linux/export.h>
	22	#include <linux/errno.h>
	23	#include <linux/swap.h>
	24	#include <linux/init.h>
	25	#include <linux/bootmem.h>
	26	#include <linux/mman.h>
	27	#include <linux/nodemask.h>
	28	#include <linux/initrd.h>
	29	#include <linux/gfp.h>
	30	#include <linux/memblock.h>
	31	#include <linux/sort.h>
	32	#include <linux/of_fdt.h>
	33
	34	#include <asm/prom.h>
	35	#include <asm/sections.h>
	36	#include <asm/setup.h>
	37	#include <asm/sizes.h>
	38	#include <asm/tlb.h>
	39
	40	#include "mm.h"
	41
	42	static unsigned long phys_initrd_start __initdata = 0;
	43	static unsigned long phys_initrd_size __initdata = 0;
	44
	45	phys_addr_t memstart_addr __read_mostly = 0;
	46
374d5c99	47	void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
c1cc1552 CM	48	{
	49	phys_initrd_start = start;
	50	phys_initrd_size = end - start;
	51	}
	52
	53	static int __init early_initrd(char *p)
	54	{
	55	unsigned long start, size;
	56	char *endp;
	57
	58	start = memparse(p, &endp);
	59	if (*endp == ',') {
	60	size = memparse(endp + 1, NULL);
	61
	62	phys_initrd_start = start;
	63	phys_initrd_size = size;
	64	}
	65	return 0;
	66	}
	67	early_param("initrd", early_initrd);
	68
	69	#define MAX_DMA32_PFN ((4UL * 1024 * 1024 * 1024) >> PAGE_SHIFT)
	70
	71	static void __init zone_sizes_init(unsigned long min, unsigned long max)
	72	{
	73	struct memblock_region *reg;
	74	unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
	75	unsigned long max_dma32 = min;
	76
	77	memset(zone_size, 0, sizeof(zone_size));
	78
	79	#ifdef CONFIG_ZONE_DMA32
	80	/* 4GB maximum for 32-bit only capable devices */
938edf5c WD	81	max_dma32 = max(min, min(max, MAX_DMA32_PFN));
938edf5c WD	82	zone_size[ZONE_DMA32] = max_dma32 - min;
c1cc1552 CM	83	#endif
	84	zone_size[ZONE_NORMAL] = max - max_dma32;
	85
	86	memcpy(zhole_size, zone_size, sizeof(zhole_size));
	87
	88	for_each_memblock(memory, reg) {
	89	unsigned long start = memblock_region_memory_base_pfn(reg);
	90	unsigned long end = memblock_region_memory_end_pfn(reg);
	91
	92	if (start >= max)
	93	continue;
	94	#ifdef CONFIG_ZONE_DMA32
	95	if (start < max_dma32) {
	96	unsigned long dma_end = min(end, max_dma32);
	97	zhole_size[ZONE_DMA32] -= dma_end - start;
	98	}
	99	#endif
	100	if (end > max_dma32) {
	101	unsigned long normal_end = min(end, max);
	102	unsigned long normal_start = max(start, max_dma32);
	103	zhole_size[ZONE_NORMAL] -= normal_end - normal_start;
	104	}
	105	}
	106
	107	free_area_init_node(0, zone_size, min, zhole_size);
	108	}
	109
	110	#ifdef CONFIG_HAVE_ARCH_PFN_VALID
	111	int pfn_valid(unsigned long pfn)
	112	{
	113	return memblock_is_memory(pfn << PAGE_SHIFT);
	114	}
	115	EXPORT_SYMBOL(pfn_valid);
	116	#endif
	117
	118	#ifndef CONFIG_SPARSEMEM
	119	static void arm64_memory_present(void)
	120	{
	121	}
	122	#else
	123	static void arm64_memory_present(void)
	124	{
	125	struct memblock_region *reg;
	126
	127	for_each_memblock(memory, reg)
	128	memory_present(0, memblock_region_memory_base_pfn(reg),
	129	memblock_region_memory_end_pfn(reg));
	130	}
	131	#endif
	132
	133	void __init arm64_memblock_init(void)
	134	{
	135	u64 *reserve_map, base, size;
	136
	137	/* Register the kernel text, kernel data and initrd with memblock */
	138	memblock_reserve(__pa(_text), _end - _text);
	139	#ifdef CONFIG_BLK_DEV_INITRD
	140	if (phys_initrd_size) {
	141	memblock_reserve(phys_initrd_start, phys_initrd_size);
	142
	143	/* Now convert initrd to virtual addresses */
	144	initrd_start = __phys_to_virt(phys_initrd_start);
	145	initrd_end = initrd_start + phys_initrd_size;
	146	}
147	#endif
148
149	/*
150	* Reserve the page tables. These are already in use,
151	* and can only be in node 0.
152	*/
153	memblock_reserve(__pa(swapper_pg_dir), SWAPPER_DIR_SIZE);
154	memblock_reserve(__pa(idmap_pg_dir), IDMAP_DIR_SIZE);
155
156	/* Reserve the dtb region */
157	memblock_reserve(virt_to_phys(initial_boot_params),
158	be32_to_cpu(initial_boot_params->totalsize));
159
160	/*
161	* Process the reserve map. This will probably overlap the initrd
162	* and dtb locations which are already reserved, but overlapping
163	* doesn't hurt anything
164	*/
165	reserve_map = ((void*)initial_boot_params) +
166	be32_to_cpu(initial_boot_params->off_mem_rsvmap);
167	while (1) {
168	base = be64_to_cpup(reserve_map++);
169	size = be64_to_cpup(reserve_map++);
170	if (!size)
171	break;
172	memblock_reserve(base, size);
173	}
174
175	memblock_allow_resize();
176	memblock_dump_all();
177	}
178
179	void __init bootmem_init(void)
180	{
181	unsigned long min, max;
182
183	min = PFN_UP(memblock_start_of_DRAM());
184	max = PFN_DOWN(memblock_end_of_DRAM());
185
186	/*
187	* Sparsemem tries to allocate bootmem in memory_present(), so must be
188	* done after the fixed reservations.
189	*/
190	arm64_memory_present();
191
192	sparse_init();
193	zone_sizes_init(min, max);
194
195	high_memory = __va((max << PAGE_SHIFT) - 1) + 1;
196	max_pfn = max_low_pfn = max;
197	}
198
c1cc1552 CM	199	#ifndef CONFIG_SPARSEMEM_VMEMMAP
	200	static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
	201	{
	202	struct page start_pg, end_pg;
	203	unsigned long pg, pgend;
	204
	205	/*
	206	* Convert start_pfn/end_pfn to a struct page pointer.
	207	*/
	208	start_pg = pfn_to_page(start_pfn - 1) + 1;
	209	end_pg = pfn_to_page(end_pfn - 1) + 1;
	210
	211	/*
	212	* Convert to physical addresses, and round start upwards and end
	213	* downwards.
	214	*/
	215	pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
	216	pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
	217
	218	/*
	219	* If there are free pages between these, free the section of the
	220	* memmap array.
	221	*/
	222	if (pg < pgend)
	223	free_bootmem(pg, pgend - pg);
	224	}
	225
	226	/*
	227	* The mem_map array can get very big. Free the unused area of the memory map.
	228	*/
	229	static void __init free_unused_memmap(void)
	230	{
	231	unsigned long start, prev_end = 0;
	232	struct memblock_region *reg;
	233
	234	for_each_memblock(memory, reg) {
	235	start = __phys_to_pfn(reg->base);
	236
	237	#ifdef CONFIG_SPARSEMEM
	238	/*
	239	* Take care not to free memmap entries that don't exist due
	240	* to SPARSEMEM sections which aren't present.
	241	*/
	242	start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
	243	#endif
	244	/*
	245	* If we had a previous bank, and there is a space between the
	246	* current bank and the previous, free it.
	247	*/
	248	if (prev_end && prev_end < start)
	249	free_memmap(prev_end, start);
	250
	251	/*
	252	* Align up here since the VM subsystem insists that the
	253	* memmap entries are valid from the bank end aligned to
	254	* MAX_ORDER_NR_PAGES.
	255	*/
	256	prev_end = ALIGN(start + __phys_to_pfn(reg->size),
	257	MAX_ORDER_NR_PAGES);
	258	}
	259
	260	#ifdef CONFIG_SPARSEMEM
	261	if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
	262	free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
263	#endif
264	}
265	#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
266
267	/*
268	* mem_init() marks the free areas in the mem_map and tells us how much memory
269	* is free. This is done after various parts of the system have claimed their
270	* memory after the kernel image.
271	*/
272	void __init mem_init(void)
273	{
27222a3d	274	arm64_swiotlb_init();
c1cc1552 CM	275
	276	max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
	277
	278	#ifndef CONFIG_SPARSEMEM_VMEMMAP
c1cc1552 CM	279	free_unused_memmap();
c1cc1552 CM	280	#endif
bee4ebd1	281	/* this will put all unused low memory onto the freelists */
0c988534	282	free_all_bootmem();
c1cc1552	283
6879ea83	284	mem_init_print_info(NULL);
c1cc1552 CM	285
	286	#define MLK(b, t) b, t, ((t) - (b)) >> 10
	287	#define MLM(b, t) b, t, ((t) - (b)) >> 20
	288	#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
	289
	290	pr_notice("Virtual kernel memory layout:\n"
	291	" vmalloc : 0x%16lx - 0x%16lx (%6ld MB)\n"
	292	#ifdef CONFIG_SPARSEMEM_VMEMMAP
	293	" vmemmap : 0x%16lx - 0x%16lx (%6ld MB)\n"
	294	#endif
	295	" modules : 0x%16lx - 0x%16lx (%6ld MB)\n"
	296	" memory : 0x%16lx - 0x%16lx (%6ld MB)\n"
	297	" .init : 0x%p" " - 0x%p" " (%6ld kB)\n"
	298	" .text : 0x%p" " - 0x%p" " (%6ld kB)\n"
	299	" .data : 0x%p" " - 0x%p" " (%6ld kB)\n",
	300	MLM(VMALLOC_START, VMALLOC_END),
	301	#ifdef CONFIG_SPARSEMEM_VMEMMAP
	302	MLM((unsigned long)virt_to_page(PAGE_OFFSET),
	303	(unsigned long)virt_to_page(high_memory)),
	304	#endif
	305	MLM(MODULES_VADDR, MODULES_END),
	306	MLM(PAGE_OFFSET, (unsigned long)high_memory),
	307
	308	MLK_ROUNDUP(__init_begin, __init_end),
	309	MLK_ROUNDUP(_text, _etext),
	310	MLK_ROUNDUP(_sdata, _edata));
	311
	312	#undef MLK
	313	#undef MLM
	314	#undef MLK_ROUNDUP
	315
	316	/*
	317	* Check boundaries twice: Some fundamental inconsistencies can be
	318	* detected at build time already.
	319	*/
	320	#ifdef CONFIG_COMPAT
	321	BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64);
	322	#endif
	323	BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
	324	BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
	325
bee4ebd1	326	if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
c1cc1552 CM	327	extern int sysctl_overcommit_memory;
	328	/*
	329	* On a machine this small we won't get anywhere without
	330	* overcommit, so turn it on by default.
	331	*/
	332	sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
	333	}
	334	}
	335
	336	void free_initmem(void)
	337	{
9af5b807	338	free_initmem_default(0);
c1cc1552 CM	339	}
	340
	341	#ifdef CONFIG_BLK_DEV_INITRD
	342
	343	static int keep_initrd;
	344
	345	void free_initrd_mem(unsigned long start, unsigned long end)
	346	{
9af5b807 JL	347	if (!keep_initrd)
9af5b807 JL	348	free_reserved_area((void )start, (void )end, 0, "initrd");
c1cc1552 CM	349	}
	350
	351	static int __init keepinitrd_setup(char *__unused)
	352	{
	353	keep_initrd = 1;
	354	return 1;
	355	}
	356
	357	__setup("keepinitrd", keepinitrd_setup);
	358	#endif