hugetlb: allow arch overridden hugepage allocation
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>
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@ -39,6 +39,7 @@ void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
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extern unsigned long hugepages_treat_as_movable;
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extern const unsigned long hugetlb_zero, hugetlb_infinity;
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extern int sysctl_hugetlb_shm_group;
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extern struct list_head huge_boot_pages;
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/* arch callbacks */
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@ -188,6 +189,14 @@ struct hstate {
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char name[HSTATE_NAME_LEN];
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};
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struct huge_bootmem_page {
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struct list_head list;
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struct hstate *hstate;
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};
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/* arch callback */
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int __init alloc_bootmem_huge_page(struct hstate *h);
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void __init hugetlb_add_hstate(unsigned order);
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struct hstate *size_to_hstate(unsigned long size);
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@ -256,6 +265,7 @@ static inline struct hstate *page_hstate(struct page *page)
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#else
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struct hstate {};
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#define alloc_bootmem_huge_page(h) NULL
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#define hstate_file(f) NULL
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#define hstate_vma(v) NULL
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#define hstate_inode(i) NULL
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11
mm/hugetlb.c
11
mm/hugetlb.c
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@ -31,6 +31,8 @@ static int max_hstate;
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unsigned int default_hstate_idx;
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struct hstate hstates[HUGE_MAX_HSTATE];
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__initdata LIST_HEAD(huge_boot_pages);
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/* for command line parsing */
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static struct hstate * __initdata parsed_hstate;
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static unsigned long __initdata default_hstate_max_huge_pages;
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@ -925,14 +927,7 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma,
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return page;
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}
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static __initdata LIST_HEAD(huge_boot_pages);
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struct huge_bootmem_page {
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struct list_head list;
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struct hstate *hstate;
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};
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static int __init alloc_bootmem_huge_page(struct hstate *h)
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__attribute__((weak)) int alloc_bootmem_huge_page(struct hstate *h)
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{
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struct huge_bootmem_page *m;
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int nr_nodes = nodes_weight(node_online_map);
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