3bf5ee9564
ia64 and ppc64 had hugetlb_free_pgtables functions which were no longer being called, and it wasn't obvious what to do about them. The ppc64 case turns out to be easy: the associated tables are noted elsewhere and freed later, safe to either skip its hugetlb areas or go through the motions of freeing nothing. Since ia64 does need a special case, restore to ppc64 the special case of skipping them. The ia64 hugetlb case has been broken since pgd_addr_end went in, though it probably appeared to work okay if you just had one such area; in fact it's been broken much longer if you consider a long munmap spanning from another region into the hugetlb region. In the ia64 hugetlb region, more virtual address bits are available than in the other regions, yet the page tables are structured the same way: the page at the bottom is larger. Here we need to scale down each addr before passing it to the standard free_pgd_range. Was about to write a hugely_scaled_down macro, but found htlbpage_to_page already exists for just this purpose. Fixed off-by-one in ia64 is_hugepage_only_range. Uninline free_pgd_range to make it available to ia64. Make sure the vma-gathering loop in free_pgtables cannot join a hugepage_only_range to any other (safe to join huges? probably but don't bother). Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
145 lines
4.3 KiB
C
145 lines
4.3 KiB
C
#ifndef _LINUX_HUGETLB_H
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#define _LINUX_HUGETLB_H
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#ifdef CONFIG_HUGETLB_PAGE
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#include <linux/mempolicy.h>
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struct ctl_table;
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static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
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{
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return vma->vm_flags & VM_HUGETLB;
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}
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int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
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int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
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int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int);
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void zap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
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void unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
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int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
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int hugetlb_report_meminfo(char *);
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int hugetlb_report_node_meminfo(int, char *);
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int is_hugepage_mem_enough(size_t);
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unsigned long hugetlb_total_pages(void);
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struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
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int write);
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struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
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pmd_t *pmd, int write);
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int is_aligned_hugepage_range(unsigned long addr, unsigned long len);
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int pmd_huge(pmd_t pmd);
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struct page *alloc_huge_page(void);
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void free_huge_page(struct page *);
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extern unsigned long max_huge_pages;
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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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#ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
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#define is_hugepage_only_range(mm, addr, len) 0
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#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) \
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do { } while (0)
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#endif
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#ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
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#define prepare_hugepage_range(addr, len) \
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is_aligned_hugepage_range(addr, len)
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#else
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int prepare_hugepage_range(unsigned long addr, unsigned long len);
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#endif
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#else /* !CONFIG_HUGETLB_PAGE */
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static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
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{
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return 0;
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}
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static inline unsigned long hugetlb_total_pages(void)
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{
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return 0;
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}
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#define follow_hugetlb_page(m,v,p,vs,a,b,i) ({ BUG(); 0; })
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#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
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#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
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#define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
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#define zap_hugepage_range(vma, start, len) BUG()
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#define unmap_hugepage_range(vma, start, end) BUG()
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#define is_hugepage_mem_enough(size) 0
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#define hugetlb_report_meminfo(buf) 0
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#define hugetlb_report_node_meminfo(n, buf) 0
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#define follow_huge_pmd(mm, addr, pmd, write) NULL
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#define is_aligned_hugepage_range(addr, len) 0
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#define prepare_hugepage_range(addr, len) (-EINVAL)
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#define pmd_huge(x) 0
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#define is_hugepage_only_range(mm, addr, len) 0
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#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) \
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do { } while (0)
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#define alloc_huge_page() ({ NULL; })
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#define free_huge_page(p) ({ (void)(p); BUG(); })
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#ifndef HPAGE_MASK
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#define HPAGE_MASK 0 /* Keep the compiler happy */
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#define HPAGE_SIZE 0
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#endif
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#endif /* !CONFIG_HUGETLB_PAGE */
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#ifdef CONFIG_HUGETLBFS
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struct hugetlbfs_config {
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uid_t uid;
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gid_t gid;
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umode_t mode;
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long nr_blocks;
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long nr_inodes;
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};
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struct hugetlbfs_sb_info {
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long max_blocks; /* blocks allowed */
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long free_blocks; /* blocks free */
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long max_inodes; /* inodes allowed */
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long free_inodes; /* inodes free */
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spinlock_t stat_lock;
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};
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struct hugetlbfs_inode_info {
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struct shared_policy policy;
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struct inode vfs_inode;
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};
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static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
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{
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return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
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}
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static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
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{
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return sb->s_fs_info;
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}
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extern struct file_operations hugetlbfs_file_operations;
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extern struct vm_operations_struct hugetlb_vm_ops;
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struct file *hugetlb_zero_setup(size_t);
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int hugetlb_get_quota(struct address_space *mapping);
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void hugetlb_put_quota(struct address_space *mapping);
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static inline int is_file_hugepages(struct file *file)
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{
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return file->f_op == &hugetlbfs_file_operations;
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}
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static inline void set_file_hugepages(struct file *file)
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{
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file->f_op = &hugetlbfs_file_operations;
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}
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#else /* !CONFIG_HUGETLBFS */
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#define is_file_hugepages(file) 0
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#define set_file_hugepages(file) BUG()
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#define hugetlb_zero_setup(size) ERR_PTR(-ENOSYS)
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#endif /* !CONFIG_HUGETLBFS */
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#endif /* _LINUX_HUGETLB_H */
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