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![Mike Kravetz](/assets/img/avatar_default.png)
The page migration code employs try_to_unmap() to try and unmap the source
page. This is accomplished by using rmap_walk to find all vmas where the
page is mapped. This search stops when page mapcount is zero. For shared
PMD huge pages, the page map count is always 1 no matter the number of
mappings. Shared mappings are tracked via the reference count of the PMD
page. Therefore, try_to_unmap stops prematurely and does not completely
unmap all mappings of the source page.
This problem can result is data corruption as writes to the original
source page can happen after contents of the page are copied to the target
page. Hence, data is lost.
This problem was originally seen as DB corruption of shared global areas
after a huge page was soft offlined due to ECC memory errors. DB
developers noticed they could reproduce the issue by (hotplug) offlining
memory used to back huge pages. A simple testcase can reproduce the
problem by creating a shared PMD mapping (note that this must be at least
PUD_SIZE in size and PUD_SIZE aligned (1GB on x86)), and using
migrate_pages() to migrate process pages between nodes while continually
writing to the huge pages being migrated.
To fix, have the try_to_unmap_one routine check for huge PMD sharing by
calling huge_pmd_unshare for hugetlbfs huge pages. If it is a shared
mapping it will be 'unshared' which removes the page table entry and drops
the reference on the PMD page. After this, flush caches and TLB.
mmu notifiers are called before locking page tables, but we can not be
sure of PMD sharing until page tables are locked. Therefore, check for
the possibility of PMD sharing before locking so that notifiers can
prepare for the worst possible case.
Link: http://lkml.kernel.org/r/20180823205917.16297-2-mike.kravetz@oracle.com
[mike.kravetz@oracle.com: make _range_in_vma() a static inline]
Link: http://lkml.kernel.org/r/6063f215-a5c8-2f0c-465a-2c515ddc952d@oracle.com
Fixes: 39dde65c99
("shared page table for hugetlb page")
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
635 lines
17 KiB
C
635 lines
17 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_HUGETLB_H
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#define _LINUX_HUGETLB_H
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#include <linux/mm_types.h>
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#include <linux/mmdebug.h>
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#include <linux/fs.h>
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#include <linux/hugetlb_inline.h>
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#include <linux/cgroup.h>
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#include <linux/list.h>
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#include <linux/kref.h>
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#include <asm/pgtable.h>
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struct ctl_table;
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struct user_struct;
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struct mmu_gather;
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#ifndef is_hugepd
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/*
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* Some architectures requires a hugepage directory format that is
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* required to support multiple hugepage sizes. For example
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* a4fe3ce76 "powerpc/mm: Allow more flexible layouts for hugepage pagetables"
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* introduced the same on powerpc. This allows for a more flexible hugepage
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* pagetable layout.
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*/
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typedef struct { unsigned long pd; } hugepd_t;
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#define is_hugepd(hugepd) (0)
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#define __hugepd(x) ((hugepd_t) { (x) })
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static inline int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
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unsigned pdshift, unsigned long end,
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int write, struct page **pages, int *nr)
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{
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return 0;
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}
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#else
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extern int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
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unsigned pdshift, unsigned long end,
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int write, struct page **pages, int *nr);
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#endif
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#ifdef CONFIG_HUGETLB_PAGE
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#include <linux/mempolicy.h>
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#include <linux/shm.h>
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#include <asm/tlbflush.h>
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struct hugepage_subpool {
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spinlock_t lock;
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long count;
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long max_hpages; /* Maximum huge pages or -1 if no maximum. */
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long used_hpages; /* Used count against maximum, includes */
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/* both alloced and reserved pages. */
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struct hstate *hstate;
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long min_hpages; /* Minimum huge pages or -1 if no minimum. */
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long rsv_hpages; /* Pages reserved against global pool to */
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/* sasitfy minimum size. */
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};
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struct resv_map {
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struct kref refs;
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spinlock_t lock;
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struct list_head regions;
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long adds_in_progress;
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struct list_head region_cache;
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long region_cache_count;
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};
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extern struct resv_map *resv_map_alloc(void);
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void resv_map_release(struct kref *ref);
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extern spinlock_t hugetlb_lock;
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extern int hugetlb_max_hstate __read_mostly;
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#define for_each_hstate(h) \
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for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
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struct hugepage_subpool *hugepage_new_subpool(struct hstate *h, long max_hpages,
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long min_hpages);
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void hugepage_put_subpool(struct hugepage_subpool *spool);
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void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
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int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
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int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
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int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
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#ifdef CONFIG_NUMA
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int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
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void __user *, size_t *, loff_t *);
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#endif
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int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
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long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
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struct page **, struct vm_area_struct **,
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unsigned long *, unsigned long *, long, unsigned int,
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int *);
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void unmap_hugepage_range(struct vm_area_struct *,
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unsigned long, unsigned long, struct page *);
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void __unmap_hugepage_range_final(struct mmu_gather *tlb,
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struct vm_area_struct *vma,
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unsigned long start, unsigned long end,
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struct page *ref_page);
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void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
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unsigned long start, unsigned long end,
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struct page *ref_page);
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void hugetlb_report_meminfo(struct seq_file *);
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int hugetlb_report_node_meminfo(int, char *);
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void hugetlb_show_meminfo(void);
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unsigned long hugetlb_total_pages(void);
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vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
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unsigned long address, unsigned int flags);
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int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, pte_t *dst_pte,
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struct vm_area_struct *dst_vma,
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unsigned long dst_addr,
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unsigned long src_addr,
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struct page **pagep);
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int hugetlb_reserve_pages(struct inode *inode, long from, long to,
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struct vm_area_struct *vma,
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vm_flags_t vm_flags);
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long hugetlb_unreserve_pages(struct inode *inode, long start, long end,
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long freed);
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bool isolate_huge_page(struct page *page, struct list_head *list);
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void putback_active_hugepage(struct page *page);
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void move_hugetlb_state(struct page *oldpage, struct page *newpage, int reason);
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void free_huge_page(struct page *page);
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void hugetlb_fix_reserve_counts(struct inode *inode);
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extern struct mutex *hugetlb_fault_mutex_table;
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u32 hugetlb_fault_mutex_hash(struct hstate *h, struct mm_struct *mm,
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struct vm_area_struct *vma,
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struct address_space *mapping,
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pgoff_t idx, unsigned long address);
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pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);
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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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pte_t *huge_pte_alloc(struct mm_struct *mm,
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unsigned long addr, unsigned long sz);
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pte_t *huge_pte_offset(struct mm_struct *mm,
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unsigned long addr, unsigned long sz);
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int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
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void adjust_range_if_pmd_sharing_possible(struct vm_area_struct *vma,
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unsigned long *start, unsigned long *end);
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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_pd(struct vm_area_struct *vma,
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unsigned long address, hugepd_t hpd,
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int flags, int pdshift);
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struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
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pmd_t *pmd, int flags);
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struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
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pud_t *pud, int flags);
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struct page *follow_huge_pgd(struct mm_struct *mm, unsigned long address,
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pgd_t *pgd, int flags);
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int pmd_huge(pmd_t pmd);
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int pud_huge(pud_t pud);
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unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
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unsigned long address, unsigned long end, pgprot_t newprot);
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bool is_hugetlb_entry_migration(pte_t pte);
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#else /* !CONFIG_HUGETLB_PAGE */
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static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
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{
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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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static inline int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr,
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pte_t *ptep)
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{
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return 0;
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}
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static inline void adjust_range_if_pmd_sharing_possible(
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struct vm_area_struct *vma,
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unsigned long *start, unsigned long *end)
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{
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}
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#define follow_hugetlb_page(m,v,p,vs,a,b,i,w,n) ({ 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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static inline void hugetlb_report_meminfo(struct seq_file *m)
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{
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}
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#define hugetlb_report_node_meminfo(n, buf) 0
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static inline void hugetlb_show_meminfo(void)
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{
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}
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#define follow_huge_pd(vma, addr, hpd, flags, pdshift) NULL
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#define follow_huge_pmd(mm, addr, pmd, flags) NULL
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#define follow_huge_pud(mm, addr, pud, flags) NULL
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#define follow_huge_pgd(mm, addr, pgd, flags) NULL
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#define prepare_hugepage_range(file, addr, len) (-EINVAL)
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#define pmd_huge(x) 0
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#define pud_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) ({BUG(); 0; })
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#define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
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#define hugetlb_mcopy_atomic_pte(dst_mm, dst_pte, dst_vma, dst_addr, \
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src_addr, pagep) ({ BUG(); 0; })
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#define huge_pte_offset(mm, address, sz) 0
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static inline bool isolate_huge_page(struct page *page, struct list_head *list)
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{
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return false;
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}
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#define putback_active_hugepage(p) do {} while (0)
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#define move_hugetlb_state(old, new, reason) do {} while (0)
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static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
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unsigned long address, unsigned long end, pgprot_t newprot)
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{
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return 0;
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}
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static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
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struct vm_area_struct *vma, unsigned long start,
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unsigned long end, struct page *ref_page)
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{
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BUG();
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}
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static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
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struct vm_area_struct *vma, unsigned long start,
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unsigned long end, struct page *ref_page)
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{
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BUG();
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}
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#endif /* !CONFIG_HUGETLB_PAGE */
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/*
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* hugepages at page global directory. If arch support
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* hugepages at pgd level, they need to define this.
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*/
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#ifndef pgd_huge
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#define pgd_huge(x) 0
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#endif
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#ifndef p4d_huge
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#define p4d_huge(x) 0
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#endif
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#ifndef pgd_write
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static inline int pgd_write(pgd_t pgd)
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{
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BUG();
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return 0;
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}
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#endif
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#define HUGETLB_ANON_FILE "anon_hugepage"
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enum {
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/*
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* The file will be used as an shm file so shmfs accounting rules
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* apply
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*/
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HUGETLB_SHMFS_INODE = 1,
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/*
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* The file is being created on the internal vfs mount and shmfs
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* accounting rules do not apply
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*/
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HUGETLB_ANONHUGE_INODE = 2,
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};
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#ifdef CONFIG_HUGETLBFS
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struct hugetlbfs_sb_info {
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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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struct hstate *hstate;
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struct hugepage_subpool *spool;
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kuid_t uid;
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kgid_t gid;
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umode_t mode;
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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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struct hugetlbfs_inode_info {
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struct shared_policy policy;
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struct inode vfs_inode;
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unsigned int seals;
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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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extern const struct file_operations hugetlbfs_file_operations;
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extern const struct vm_operations_struct hugetlb_vm_ops;
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struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
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struct user_struct **user, int creat_flags,
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int page_size_log);
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static inline bool is_file_hugepages(struct file *file)
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{
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if (file->f_op == &hugetlbfs_file_operations)
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return true;
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return is_file_shm_hugepages(file);
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}
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#else /* !CONFIG_HUGETLBFS */
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#define is_file_hugepages(file) false
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static inline struct file *
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hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
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struct user_struct **user, int creat_flags,
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int page_size_log)
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{
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return ERR_PTR(-ENOSYS);
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}
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#endif /* !CONFIG_HUGETLBFS */
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#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
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unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
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unsigned long len, unsigned long pgoff,
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unsigned long flags);
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#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
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#ifdef CONFIG_HUGETLB_PAGE
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#define HSTATE_NAME_LEN 32
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/* Defines one hugetlb page size */
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struct hstate {
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int next_nid_to_alloc;
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int next_nid_to_free;
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unsigned int order;
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unsigned long mask;
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unsigned long max_huge_pages;
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unsigned long nr_huge_pages;
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unsigned long free_huge_pages;
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unsigned long resv_huge_pages;
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unsigned long surplus_huge_pages;
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unsigned long nr_overcommit_huge_pages;
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struct list_head hugepage_activelist;
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struct list_head hugepage_freelists[MAX_NUMNODES];
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unsigned int nr_huge_pages_node[MAX_NUMNODES];
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unsigned int free_huge_pages_node[MAX_NUMNODES];
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unsigned int surplus_huge_pages_node[MAX_NUMNODES];
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#ifdef CONFIG_CGROUP_HUGETLB
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/* cgroup control files */
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struct cftype cgroup_files[5];
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#endif
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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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struct page *alloc_huge_page(struct vm_area_struct *vma,
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unsigned long addr, int avoid_reserve);
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struct page *alloc_huge_page_node(struct hstate *h, int nid);
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struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
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nodemask_t *nmask);
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struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma,
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unsigned long address);
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int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
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pgoff_t idx);
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/* arch callback */
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int __init __alloc_bootmem_huge_page(struct hstate *h);
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int __init alloc_bootmem_huge_page(struct hstate *h);
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void __init hugetlb_bad_size(void);
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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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#ifndef HUGE_MAX_HSTATE
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#define HUGE_MAX_HSTATE 1
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#endif
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extern struct hstate hstates[HUGE_MAX_HSTATE];
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extern unsigned int default_hstate_idx;
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#define default_hstate (hstates[default_hstate_idx])
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static inline struct hstate *hstate_inode(struct inode *i)
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{
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return HUGETLBFS_SB(i->i_sb)->hstate;
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}
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static inline struct hstate *hstate_file(struct file *f)
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{
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return hstate_inode(file_inode(f));
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}
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static inline struct hstate *hstate_sizelog(int page_size_log)
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{
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if (!page_size_log)
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return &default_hstate;
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return size_to_hstate(1UL << page_size_log);
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}
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static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
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{
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return hstate_file(vma->vm_file);
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}
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static inline unsigned long huge_page_size(struct hstate *h)
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{
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return (unsigned long)PAGE_SIZE << h->order;
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}
|
|
|
|
extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
|
|
|
|
extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
|
|
|
|
static inline unsigned long huge_page_mask(struct hstate *h)
|
|
{
|
|
return h->mask;
|
|
}
|
|
|
|
static inline unsigned int huge_page_order(struct hstate *h)
|
|
{
|
|
return h->order;
|
|
}
|
|
|
|
static inline unsigned huge_page_shift(struct hstate *h)
|
|
{
|
|
return h->order + PAGE_SHIFT;
|
|
}
|
|
|
|
static inline bool hstate_is_gigantic(struct hstate *h)
|
|
{
|
|
return huge_page_order(h) >= MAX_ORDER;
|
|
}
|
|
|
|
static inline unsigned int pages_per_huge_page(struct hstate *h)
|
|
{
|
|
return 1 << h->order;
|
|
}
|
|
|
|
static inline unsigned int blocks_per_huge_page(struct hstate *h)
|
|
{
|
|
return huge_page_size(h) / 512;
|
|
}
|
|
|
|
#include <asm/hugetlb.h>
|
|
|
|
#ifndef arch_make_huge_pte
|
|
static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
|
|
struct page *page, int writable)
|
|
{
|
|
return entry;
|
|
}
|
|
#endif
|
|
|
|
static inline struct hstate *page_hstate(struct page *page)
|
|
{
|
|
VM_BUG_ON_PAGE(!PageHuge(page), page);
|
|
return size_to_hstate(PAGE_SIZE << compound_order(page));
|
|
}
|
|
|
|
static inline unsigned hstate_index_to_shift(unsigned index)
|
|
{
|
|
return hstates[index].order + PAGE_SHIFT;
|
|
}
|
|
|
|
static inline int hstate_index(struct hstate *h)
|
|
{
|
|
return h - hstates;
|
|
}
|
|
|
|
pgoff_t __basepage_index(struct page *page);
|
|
|
|
/* Return page->index in PAGE_SIZE units */
|
|
static inline pgoff_t basepage_index(struct page *page)
|
|
{
|
|
if (!PageCompound(page))
|
|
return page->index;
|
|
|
|
return __basepage_index(page);
|
|
}
|
|
|
|
extern int dissolve_free_huge_page(struct page *page);
|
|
extern int dissolve_free_huge_pages(unsigned long start_pfn,
|
|
unsigned long end_pfn);
|
|
static inline bool hugepage_migration_supported(struct hstate *h)
|
|
{
|
|
#ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
|
|
if ((huge_page_shift(h) == PMD_SHIFT) ||
|
|
(huge_page_shift(h) == PGDIR_SHIFT))
|
|
return true;
|
|
else
|
|
return false;
|
|
#else
|
|
return false;
|
|
#endif
|
|
}
|
|
|
|
static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
|
|
struct mm_struct *mm, pte_t *pte)
|
|
{
|
|
if (huge_page_size(h) == PMD_SIZE)
|
|
return pmd_lockptr(mm, (pmd_t *) pte);
|
|
VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
|
|
return &mm->page_table_lock;
|
|
}
|
|
|
|
#ifndef hugepages_supported
|
|
/*
|
|
* Some platform decide whether they support huge pages at boot
|
|
* time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
|
|
* when there is no such support
|
|
*/
|
|
#define hugepages_supported() (HPAGE_SHIFT != 0)
|
|
#endif
|
|
|
|
void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm);
|
|
|
|
static inline void hugetlb_count_add(long l, struct mm_struct *mm)
|
|
{
|
|
atomic_long_add(l, &mm->hugetlb_usage);
|
|
}
|
|
|
|
static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
|
|
{
|
|
atomic_long_sub(l, &mm->hugetlb_usage);
|
|
}
|
|
|
|
#ifndef set_huge_swap_pte_at
|
|
static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
|
|
pte_t *ptep, pte_t pte, unsigned long sz)
|
|
{
|
|
set_huge_pte_at(mm, addr, ptep, pte);
|
|
}
|
|
#endif
|
|
#else /* CONFIG_HUGETLB_PAGE */
|
|
struct hstate {};
|
|
#define alloc_huge_page(v, a, r) NULL
|
|
#define alloc_huge_page_node(h, nid) NULL
|
|
#define alloc_huge_page_nodemask(h, preferred_nid, nmask) NULL
|
|
#define alloc_huge_page_vma(h, vma, address) NULL
|
|
#define alloc_bootmem_huge_page(h) NULL
|
|
#define hstate_file(f) NULL
|
|
#define hstate_sizelog(s) NULL
|
|
#define hstate_vma(v) NULL
|
|
#define hstate_inode(i) NULL
|
|
#define page_hstate(page) NULL
|
|
#define huge_page_size(h) PAGE_SIZE
|
|
#define huge_page_mask(h) PAGE_MASK
|
|
#define vma_kernel_pagesize(v) PAGE_SIZE
|
|
#define vma_mmu_pagesize(v) PAGE_SIZE
|
|
#define huge_page_order(h) 0
|
|
#define huge_page_shift(h) PAGE_SHIFT
|
|
static inline bool hstate_is_gigantic(struct hstate *h)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline unsigned int pages_per_huge_page(struct hstate *h)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static inline unsigned hstate_index_to_shift(unsigned index)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int hstate_index(struct hstate *h)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline pgoff_t basepage_index(struct page *page)
|
|
{
|
|
return page->index;
|
|
}
|
|
|
|
static inline int dissolve_free_huge_page(struct page *page)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int dissolve_free_huge_pages(unsigned long start_pfn,
|
|
unsigned long end_pfn)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline bool hugepage_migration_supported(struct hstate *h)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
|
|
struct mm_struct *mm, pte_t *pte)
|
|
{
|
|
return &mm->page_table_lock;
|
|
}
|
|
|
|
static inline void hugetlb_report_usage(struct seq_file *f, struct mm_struct *m)
|
|
{
|
|
}
|
|
|
|
static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
|
|
{
|
|
}
|
|
|
|
static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
|
|
pte_t *ptep, pte_t pte, unsigned long sz)
|
|
{
|
|
}
|
|
#endif /* CONFIG_HUGETLB_PAGE */
|
|
|
|
static inline spinlock_t *huge_pte_lock(struct hstate *h,
|
|
struct mm_struct *mm, pte_t *pte)
|
|
{
|
|
spinlock_t *ptl;
|
|
|
|
ptl = huge_pte_lockptr(h, mm, pte);
|
|
spin_lock(ptl);
|
|
return ptl;
|
|
}
|
|
|
|
#endif /* _LINUX_HUGETLB_H */
|