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memblock: Kill early_node_map[]

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Now all ARCH_POPULATES_NODE_MAP archs select HAVE_MEBLOCK_NODE_MAP -
there's no user of early_node_map[] left.  Kill early_node_map[] and
replace ARCH_POPULATES_NODE_MAP with HAVE_MEMBLOCK_NODE_MAP.  Also,
relocate for_each_mem_pfn_range() and helper from mm.h to memblock.h
as page_alloc.c would no longer host an alternative implementation.

This change is ultimately one to one mapping and shouldn't cause any
observable difference; however, after the recent changes, there are
some functions which now would fit memblock.c better than page_alloc.c
and dependency on HAVE_MEMBLOCK_NODE_MAP instead of HAVE_MEMBLOCK
doesn't make much sense on some of them.  Further cleanups for
functions inside HAVE_MEMBLOCK_NODE_MAP in mm.h would be nice.

-v2: Fix compile bug introduced by mis-spelling
 CONFIG_HAVE_MEMBLOCK_NODE_MAP to CONFIG_MEMBLOCK_HAVE_NODE_MAP in
 mmzone.h.  Reported by Stephen Rothwell.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Chen Liqin <liqin.chen@sunplusct.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: "H. Peter Anvin" <hpa@zytor.com>
This commit is contained in:
Tejun Heo 2011-12-08 10:22:09 -08:00
commit 0ee332c145
14 changed files with 54 additions and 311 deletions
Download patch file Download diff file Expand all files Collapse all files

3
arch/ia64/Kconfig
View file

@ -477,9 +477,6 @@ config NODES_SHIFT
MAX_NUMNODES will be 2^(This value).
If in doubt, use the default.
config ARCH_POPULATES_NODE_MAP
def_bool y
# VIRTUAL_MEM_MAP and FLAT_NODE_MEM_MAP are functionally equivalent.
# VIRTUAL_MEM_MAP has been retained for historical reasons.
config VIRTUAL_MEM_MAP

3
arch/mips/Kconfig
View file

@ -2067,9 +2067,6 @@ config ARCH_DISCONTIGMEM_ENABLE
or have huge holes in the physical address space for other reasons.
See <file:Documentation/vm/numa> for more.
config ARCH_POPULATES_NODE_MAP
def_bool y
config ARCH_SPARSEMEM_ENABLE
bool
select SPARSEMEM_STATIC

3
arch/powerpc/Kconfig
View file

@ -422,9 +422,6 @@ config ARCH_SPARSEMEM_DEFAULT
def_bool y
depends on (SMP && PPC_PSERIES) || PPC_PS3
config ARCH_POPULATES_NODE_MAP
def_bool y
config SYS_SUPPORTS_HUGETLBFS
bool

3
arch/s390/Kconfig
View file

@ -348,9 +348,6 @@ config WARN_DYNAMIC_STACK
Say N if you are unsure.
config ARCH_POPULATES_NODE_MAP
def_bool y
comment "Kernel preemption"
source "kernel/Kconfig.preempt"

3
arch/score/Kconfig
View file

@ -63,9 +63,6 @@ config 32BIT
config ARCH_FLATMEM_ENABLE
def_bool y
config ARCH_POPULATES_NODE_MAP
def_bool y
source "mm/Kconfig"
config MEMORY_START

3
arch/sh/mm/Kconfig
View file

@ -143,9 +143,6 @@ config MAX_ACTIVE_REGIONS
CPU_SUBTYPE_SH7785)
default "1"
config ARCH_POPULATES_NODE_MAP
def_bool y
config ARCH_SELECT_MEMORY_MODEL
def_bool y

3
arch/sparc/Kconfig
View file

@ -353,9 +353,6 @@ config NODES_SPAN_OTHER_NODES
def_bool y
depends on NEED_MULTIPLE_NODES
config ARCH_POPULATES_NODE_MAP
def_bool y if SPARC64
config ARCH_SELECT_MEMORY_MODEL
def_bool y if SPARC64

3
arch/x86/Kconfig
View file

@ -206,9 +206,6 @@ config ZONE_DMA32
bool
default X86_64
config ARCH_POPULATES_NODE_MAP
def_bool y
config AUDIT_ARCH
bool
default X86_64

1
drivers/iommu/intel-iommu.c
View file

@ -41,6 +41,7 @@
#include <linux/tboot.h>
#include <linux/dmi.h>
#include <linux/pci-ats.h>
#include <linux/memblock.h>
#include <asm/cacheflush.h>
#include <asm/iommu.h>

23
include/linux/memblock.h
View file

@ -58,6 +58,26 @@ int memblock_remove(phys_addr_t base, phys_addr_t size);
int memblock_free(phys_addr_t base, phys_addr_t size);
int memblock_reserve(phys_addr_t base, phys_addr_t size);
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
unsigned long *out_end_pfn, int *out_nid);
/**
* for_each_mem_pfn_range - early memory pfn range iterator
* @i: an integer used as loop variable
* @nid: node selector, %MAX_NUMNODES for all nodes
* @p_start: ptr to ulong for start pfn of the range, can be %NULL
* @p_end: ptr to ulong for end pfn of the range, can be %NULL
* @p_nid: ptr to int for nid of the range, can be %NULL
*
* Walks over configured memory ranges. Available after early_node_map is
* populated.
*/
#define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid) \
for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \
i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid))
#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
void __next_free_mem_range(u64 *idx, int nid, phys_addr_t *out_start,
phys_addr_t *out_end, int *out_nid);
@ -101,9 +121,6 @@ static inline int memblock_get_region_node(const struct memblock_region *r)
}
#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
/* The numa aware allocator is only available if
* CONFIG_ARCH_POPULATES_NODE_MAP is set
*/
phys_addr_t memblock_find_in_range_node(phys_addr_t start, phys_addr_t end,
phys_addr_t size, phys_addr_t align, int nid);
phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid);

50
include/linux/mm.h
View file

@ -1252,43 +1252,34 @@ static inline void pgtable_page_dtor(struct page *page)
extern void free_area_init(unsigned long * zones_size);
extern void free_area_init_node(int nid, unsigned long * zones_size,
unsigned long zone_start_pfn, unsigned long *zholes_size);
#ifdef CONFIG_ARCH_POPULATES_NODE_MAP
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
/*
* With CONFIG_ARCH_POPULATES_NODE_MAP set, an architecture may initialise its
* With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its
* zones, allocate the backing mem_map and account for memory holes in a more
* architecture independent manner. This is a substitute for creating the
* zone_sizes[] and zholes_size[] arrays and passing them to
* free_area_init_node()
*
* An architecture is expected to register range of page frames backed by
* physical memory with add_active_range() before calling
* physical memory with memblock_add[_node]() before calling
* free_area_init_nodes() passing in the PFN each zone ends at. At a basic
* usage, an architecture is expected to do something like
*
* unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
* max_highmem_pfn};
* for_each_valid_physical_page_range()
* add_active_range(node_id, start_pfn, end_pfn)
* memblock_add_node(base, size, nid)
* free_area_init_nodes(max_zone_pfns);
*
* If the architecture guarantees that there are no holes in the ranges
* registered with add_active_range(), free_bootmem_active_regions()
* will call free_bootmem_node() for each registered physical page range.
* Similarly sparse_memory_present_with_active_regions() calls
* memory_present() for each range when SPARSEMEM is enabled.
* free_bootmem_with_active_regions() calls free_bootmem_node() for each
* registered physical page range. Similarly
* sparse_memory_present_with_active_regions() calls memory_present() for
* each range when SPARSEMEM is enabled.
*
* See mm/page_alloc.c for more information on each function exposed by
* CONFIG_ARCH_POPULATES_NODE_MAP
* CONFIG_HAVE_MEMBLOCK_NODE_MAP.
*/
extern void free_area_init_nodes(unsigned long *max_zone_pfn);
#ifndef CONFIG_HAVE_MEMBLOCK_NODE_MAP
extern void add_active_range(unsigned int nid, unsigned long start_pfn,
unsigned long end_pfn);
extern void remove_active_range(unsigned int nid, unsigned long start_pfn,
unsigned long end_pfn);
extern void remove_all_active_ranges(void);
void sort_node_map(void);
#endif
unsigned long node_map_pfn_alignment(void);
unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn,
unsigned long end_pfn);
@ -1303,28 +1294,9 @@ int add_from_early_node_map(struct range *range, int az,
int nr_range, int nid);
extern void sparse_memory_present_with_active_regions(int nid);
extern void __next_mem_pfn_range(int *idx, int nid,
unsigned long *out_start_pfn,
unsigned long *out_end_pfn, int *out_nid);
#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
/**
* for_each_mem_pfn_range - early memory pfn range iterator
* @i: an integer used as loop variable
* @nid: node selector, %MAX_NUMNODES for all nodes
* @p_start: ptr to ulong for start pfn of the range, can be %NULL
* @p_end: ptr to ulong for end pfn of the range, can be %NULL
* @p_nid: ptr to int for nid of the range, can be %NULL
*
* Walks over configured memory ranges. Available after early_node_map is
* populated.
*/
#define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid) \
for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \
i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid))
#endif /* CONFIG_ARCH_POPULATES_NODE_MAP */
#if !defined(CONFIG_ARCH_POPULATES_NODE_MAP) && \
#if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
!defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
static inline int __early_pfn_to_nid(unsigned long pfn)
{

8
include/linux/mmzone.h
View file

@ -598,13 +598,13 @@ struct zonelist {
#endif
};
#ifdef CONFIG_ARCH_POPULATES_NODE_MAP
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
struct node_active_region {
unsigned long start_pfn;
unsigned long end_pfn;
int nid;
};
#endif /* CONFIG_ARCH_POPULATES_NODE_MAP */
#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
#ifndef CONFIG_DISCONTIGMEM
/* The array of struct pages - for discontigmem use pgdat->lmem_map */
@ -720,7 +720,7 @@ extern int movable_zone;
static inline int zone_movable_is_highmem(void)
{
#if defined(CONFIG_HIGHMEM) && defined(CONFIG_ARCH_POPULATES_NODE_MAP)
#if defined(CONFIG_HIGHMEM) && defined(CONFIG_HAVE_MEMBLOCK_NODE)
return movable_zone == ZONE_HIGHMEM;
#else
return 0;
@ -938,7 +938,7 @@ static inline struct zoneref *first_zones_zonelist(struct zonelist *zonelist,
#endif
#if !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID) && \
!defined(CONFIG_ARCH_POPULATES_NODE_MAP)
!defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP)
static inline unsigned long early_pfn_to_nid(unsigned long pfn)
{
return 0;

2
mm/memblock.c
View file

@ -716,7 +716,7 @@ phys_addr_t __init memblock_alloc(phys_addr_t size, phys_addr_t align)
static phys_addr_t __init memblock_nid_range_rev(phys_addr_t start,
phys_addr_t end, int *nid)
{
#ifdef CONFIG_ARCH_POPULATES_NODE_MAP
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
unsigned long start_pfn, end_pfn;
int i;

241
mm/page_alloc.c
View file

@ -181,32 +181,7 @@ static unsigned long __meminitdata nr_kernel_pages;
static unsigned long __meminitdata nr_all_pages;
static unsigned long __meminitdata dma_reserve;
#ifdef CONFIG_ARCH_POPULATES_NODE_MAP
#ifndef CONFIG_HAVE_MEMBLOCK_NODE_MAP
/*
* MAX_ACTIVE_REGIONS determines the maximum number of distinct ranges
* of memory (RAM) that may be registered with add_active_range().
* Ranges passed to add_active_range() will be merged if possible so
* the number of times add_active_range() can be called is related to
* the number of nodes and the number of holes
*/
#ifdef CONFIG_MAX_ACTIVE_REGIONS
/* Allow an architecture to set MAX_ACTIVE_REGIONS to save memory */
#define MAX_ACTIVE_REGIONS CONFIG_MAX_ACTIVE_REGIONS
#else
#if MAX_NUMNODES >= 32
/* If there can be many nodes, allow up to 50 holes per node */
#define MAX_ACTIVE_REGIONS (MAX_NUMNODES*50)
#else
/* By default, allow up to 256 distinct regions */
#define MAX_ACTIVE_REGIONS 256
#endif
#endif
static struct node_active_region __meminitdata early_node_map[MAX_ACTIVE_REGIONS];
static int __meminitdata nr_nodemap_entries;
#endif /* !CONFIG_HAVE_MEMBLOCK_NODE_MAP */
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
static unsigned long __meminitdata arch_zone_lowest_possible_pfn[MAX_NR_ZONES];
static unsigned long __meminitdata arch_zone_highest_possible_pfn[MAX_NR_ZONES];
static unsigned long __initdata required_kernelcore;
@ -216,7 +191,7 @@ static unsigned long __meminitdata dma_reserve;
/* movable_zone is the "real" zone pages in ZONE_MOVABLE are taken from */
int movable_zone;
EXPORT_SYMBOL(movable_zone);
#endif /* CONFIG_ARCH_POPULATES_NODE_MAP */
#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
#if MAX_NUMNODES > 1
int nr_node_ids __read_mostly = MAX_NUMNODES;
@ -3734,7 +3709,7 @@ __meminit int init_currently_empty_zone(struct zone *zone,
return 0;
}
#ifdef CONFIG_ARCH_POPULATES_NODE_MAP
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
#ifndef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
/*
* Required by SPARSEMEM. Given a PFN, return what node the PFN is on.
@ -4002,7 +3977,7 @@ static unsigned long __meminit zone_absent_pages_in_node(int nid,
return __absent_pages_in_range(nid, zone_start_pfn, zone_end_pfn);
}
#else
#else /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
static inline unsigned long __meminit zone_spanned_pages_in_node(int nid,
unsigned long zone_type,
unsigned long *zones_size)
@ -4020,7 +3995,7 @@ static inline unsigned long __meminit zone_absent_pages_in_node(int nid,
return zholes_size[zone_type];
}
#endif
#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
static void __meminit calculate_node_totalpages(struct pglist_data *pgdat,
unsigned long *zones_size, unsigned long *zholes_size)
@ -4243,10 +4218,10 @@ static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat)
*/
if (pgdat == NODE_DATA(0)) {
mem_map = NODE_DATA(0)->node_mem_map;
#ifdef CONFIG_ARCH_POPULATES_NODE_MAP
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
if (page_to_pfn(mem_map) != pgdat->node_start_pfn)
mem_map -= (pgdat->node_start_pfn - ARCH_PFN_OFFSET);
#endif /* CONFIG_ARCH_POPULATES_NODE_MAP */
#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
}
#endif
#endif /* CONFIG_FLAT_NODE_MEM_MAP */
@ -4271,7 +4246,7 @@ void __paginginit free_area_init_node(int nid, unsigned long *zones_size,
free_area_init_core(pgdat, zones_size, zholes_size);
}
#ifdef CONFIG_ARCH_POPULATES_NODE_MAP
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
#if MAX_NUMNODES > 1
/*
@ -4292,201 +4267,6 @@ static inline void setup_nr_node_ids(void)
}
#endif
#ifndef CONFIG_HAVE_MEMBLOCK_NODE_MAP
/*
* Common iterator interface used to define for_each_mem_pfn_range().
*/
void __meminit __next_mem_pfn_range(int *idx, int nid,
unsigned long *out_start_pfn,
unsigned long *out_end_pfn, int *out_nid)
{
struct node_active_region *r = NULL;
while (++*idx < nr_nodemap_entries) {
if (nid == MAX_NUMNODES || nid == early_node_map[*idx].nid) {
r = &early_node_map[*idx];
break;
}
}
if (!r) {
*idx = -1;
return;
}
if (out_start_pfn)
*out_start_pfn = r->start_pfn;
if (out_end_pfn)
*out_end_pfn = r->end_pfn;
if (out_nid)
*out_nid = r->nid;
}
/**
* add_active_range - Register a range of PFNs backed by physical memory
* @nid: The node ID the range resides on
* @start_pfn: The start PFN of the available physical memory
* @end_pfn: The end PFN of the available physical memory
*
* These ranges are stored in an early_node_map[] and later used by
* free_area_init_nodes() to calculate zone sizes and holes. If the
* range spans a memory hole, it is up to the architecture to ensure
* the memory is not freed by the bootmem allocator. If possible
* the range being registered will be merged with existing ranges.
*/
void __init add_active_range(unsigned int nid, unsigned long start_pfn,
unsigned long end_pfn)
{
int i;
mminit_dprintk(MMINIT_TRACE, "memory_register",
"Entering add_active_range(%d, %#lx, %#lx) "
"%d entries of %d used\n",
nid, start_pfn, end_pfn,
nr_nodemap_entries, MAX_ACTIVE_REGIONS);
mminit_validate_memmodel_limits(&start_pfn, &end_pfn);
/* Merge with existing active regions if possible */
for (i = 0; i < nr_nodemap_entries; i++) {
if (early_node_map[i].nid != nid)
continue;
/* Skip if an existing region covers this new one */
if (start_pfn >= early_node_map[i].start_pfn &&
end_pfn <= early_node_map[i].end_pfn)
return;
/* Merge forward if suitable */
if (start_pfn <= early_node_map[i].end_pfn &&
end_pfn > early_node_map[i].end_pfn) {
early_node_map[i].end_pfn = end_pfn;
return;
}
/* Merge backward if suitable */
if (start_pfn < early_node_map[i].start_pfn &&
end_pfn >= early_node_map[i].start_pfn) {
early_node_map[i].start_pfn = start_pfn;
return;
}
}
/* Check that early_node_map is large enough */
if (i >= MAX_ACTIVE_REGIONS) {
printk(KERN_CRIT "More than %d memory regions, truncating\n",
MAX_ACTIVE_REGIONS);
return;
}
early_node_map[i].nid = nid;
early_node_map[i].start_pfn = start_pfn;
early_node_map[i].end_pfn = end_pfn;
nr_nodemap_entries = i + 1;
}
/**
* remove_active_range - Shrink an existing registered range of PFNs
* @nid: The node id the range is on that should be shrunk
* @start_pfn: The new PFN of the range
* @end_pfn: The new PFN of the range
*
* i386 with NUMA use alloc_remap() to store a node_mem_map on a local node.
* The map is kept near the end physical page range that has already been
* registered. This function allows an arch to shrink an existing registered
* range.
*/
void __init remove_active_range(unsigned int nid, unsigned long start_pfn,
unsigned long end_pfn)
{
unsigned long this_start_pfn, this_end_pfn;
int i, j;
int removed = 0;
printk(KERN_DEBUG "remove_active_range (%d, %lu, %lu)\n",
nid, start_pfn, end_pfn);
/* Find the old active region end and shrink */
for_each_mem_pfn_range(i, nid, &this_start_pfn, &this_end_pfn, NULL) {
if (this_start_pfn >= start_pfn && this_end_pfn <= end_pfn) {
/* clear it */
early_node_map[i].start_pfn = 0;
early_node_map[i].end_pfn = 0;
removed = 1;
continue;
}
if (this_start_pfn < start_pfn && this_end_pfn > start_pfn) {
early_node_map[i].end_pfn = start_pfn;
if (this_end_pfn > end_pfn)
add_active_range(nid, end_pfn, this_end_pfn);
continue;
}
if (this_start_pfn >= start_pfn && this_end_pfn > end_pfn &&
this_start_pfn < end_pfn) {
early_node_map[i].start_pfn = end_pfn;
continue;
}
}
if (!removed)
return;
/* remove the blank ones */
for (i = nr_nodemap_entries - 1; i > 0; i--) {
if (early_node_map[i].nid != nid)
continue;
if (early_node_map[i].end_pfn)
continue;
/* we found it, get rid of it */
for (j = i; j < nr_nodemap_entries - 1; j++)
memcpy(&early_node_map[j], &early_node_map[j+1],
sizeof(early_node_map[j]));
j = nr_nodemap_entries - 1;
memset(&early_node_map[j], 0, sizeof(early_node_map[j]));
nr_nodemap_entries--;
}
}
/**
* remove_all_active_ranges - Remove all currently registered regions
*
* During discovery, it may be found that a table like SRAT is invalid
* and an alternative discovery method must be used. This function removes
* all currently registered regions.
*/
void __init remove_all_active_ranges(void)
{
memset(early_node_map, 0, sizeof(early_node_map));
nr_nodemap_entries = 0;
}
/* Compare two active node_active_regions */
static int __init cmp_node_active_region(const void *a, const void *b)
{
struct node_active_region *arange = (struct node_active_region *)a;
struct node_active_region *brange = (struct node_active_region *)b;
/* Done this way to avoid overflows */
if (arange->start_pfn > brange->start_pfn)
return 1;
if (arange->start_pfn < brange->start_pfn)
return -1;
return 0;
}
/* sort the node_map by start_pfn */
void __init sort_node_map(void)
{
sort(early_node_map, (size_t)nr_nodemap_entries,
sizeof(struct node_active_region),
cmp_node_active_region, NULL);
}
#else /* !CONFIG_HAVE_MEMBLOCK_NODE_MAP */
static inline void sort_node_map(void)
{
}
#endif
/**
* node_map_pfn_alignment - determine the maximum internode alignment
*
@ -4764,9 +4544,6 @@ void __init free_area_init_nodes(unsigned long *max_zone_pfn)
unsigned long start_pfn, end_pfn;
int i, nid;
/* Sort early_node_map as initialisation assumes it is sorted */
sort_node_map();
/* Record where the zone boundaries are */
memset(arch_zone_lowest_possible_pfn, 0,
sizeof(arch_zone_lowest_possible_pfn));
@ -4867,7 +4644,7 @@ static int __init cmdline_parse_movablecore(char *p)
early_param("kernelcore", cmdline_parse_kernelcore);
early_param("movablecore", cmdline_parse_movablecore);
#endif /* CONFIG_ARCH_POPULATES_NODE_MAP */
#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
/**
* set_dma_reserve - set the specified number of pages reserved in the first zone