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hugetlb: allow arch overridden hugepage allocation

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Allow alloc_bootmem_huge_page() to be overridden by architectures that
can't always use bootmem.  This requires huge_boot_pages to be available
for use by this function.

This is required for powerpc 16G pages, which have to be reserved prior to
boot-time.  The location of these pages are indicated in the device tree.

Acked-by: Adam Litke <agl@us.ibm.com>
Signed-off-by: Jon Tollefson <kniht@linux.vnet.ibm.com>
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jon Tollefson 2008-07-23 21:27:52 -07:00 committed by Linus Torvalds
parent e11bfbfcb0
commit 53ba51d21d
2 changed files with 13 additions and 8 deletions
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10
include/linux/hugetlb.h
View file

@ -39,6 +39,7 @@ void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
extern unsigned long hugepages_treat_as_movable;
extern const unsigned long hugetlb_zero, hugetlb_infinity;
extern int sysctl_hugetlb_shm_group;
extern struct list_head huge_boot_pages;
/* arch callbacks */
@ -188,6 +189,14 @@ struct hstate {
char name[HSTATE_NAME_LEN];
};
struct huge_bootmem_page {
struct list_head list;
struct hstate *hstate;
};
/* arch callback */
int __init alloc_bootmem_huge_page(struct hstate *h);
void __init hugetlb_add_hstate(unsigned order);
struct hstate *size_to_hstate(unsigned long size);
@ -256,6 +265,7 @@ static inline struct hstate *page_hstate(struct page *page)
#else
struct hstate {};
#define alloc_bootmem_huge_page(h) NULL
#define hstate_file(f) NULL
#define hstate_vma(v) NULL
#define hstate_inode(i) NULL

11
mm/hugetlb.c
View file

@ -31,6 +31,8 @@ static int max_hstate;
unsigned int default_hstate_idx;
struct hstate hstates[HUGE_MAX_HSTATE];
__initdata LIST_HEAD(huge_boot_pages);
/* for command line parsing */
static struct hstate * __initdata parsed_hstate;
static unsigned long __initdata default_hstate_max_huge_pages;
@ -925,14 +927,7 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma,
return page;
}
static __initdata LIST_HEAD(huge_boot_pages);
struct huge_bootmem_page {
struct list_head list;
struct hstate *hstate;
};
static int __init alloc_bootmem_huge_page(struct hstate *h)
__attribute__((weak)) int alloc_bootmem_huge_page(struct hstate *h)
{
struct huge_bootmem_page *m;
int nr_nodes = nodes_weight(node_online_map);