717 lines
19 KiB
C
717 lines
19 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_HUGE_MM_H
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#define _LINUX_HUGE_MM_H
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#include <linux/sched/coredump.h>
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#include <linux/mm_types.h>
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#include <linux/fs.h> /* only for vma_is_dax() */
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vm_fault_t do_huge_pmd_anonymous_page(struct vm_fault *vmf);
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int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
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pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr,
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struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma);
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void huge_pmd_set_accessed(struct vm_fault *vmf, pmd_t orig_pmd);
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int copy_huge_pud(struct mm_struct *dst_mm, struct mm_struct *src_mm,
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pud_t *dst_pud, pud_t *src_pud, unsigned long addr,
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struct vm_area_struct *vma);
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#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
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void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud);
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#else
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static inline void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud)
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{
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}
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#endif
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vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd);
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struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
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unsigned long addr, pmd_t *pmd,
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unsigned int flags);
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bool madvise_free_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
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pmd_t *pmd, unsigned long addr, unsigned long next);
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int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma, pmd_t *pmd,
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unsigned long addr);
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int zap_huge_pud(struct mmu_gather *tlb, struct vm_area_struct *vma, pud_t *pud,
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unsigned long addr);
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bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr,
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unsigned long new_addr, pmd_t *old_pmd, pmd_t *new_pmd);
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int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, unsigned long addr,
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pgprot_t newprot, unsigned long cp_flags);
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vm_fault_t vmf_insert_pfn_pmd_prot(struct vm_fault *vmf, pfn_t pfn,
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pgprot_t pgprot, bool write);
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/**
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* vmf_insert_pfn_pmd - insert a pmd size pfn
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* @vmf: Structure describing the fault
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* @pfn: pfn to insert
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* @pgprot: page protection to use
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* @write: whether it's a write fault
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*
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* Insert a pmd size pfn. See vmf_insert_pfn() for additional info.
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*
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* Return: vm_fault_t value.
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*/
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static inline vm_fault_t vmf_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn,
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bool write)
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{
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return vmf_insert_pfn_pmd_prot(vmf, pfn, vmf->vma->vm_page_prot, write);
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}
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vm_fault_t vmf_insert_pfn_pud_prot(struct vm_fault *vmf, pfn_t pfn,
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pgprot_t pgprot, bool write);
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/**
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* vmf_insert_pfn_pud - insert a pud size pfn
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* @vmf: Structure describing the fault
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* @pfn: pfn to insert
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* @pgprot: page protection to use
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* @write: whether it's a write fault
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*
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* Insert a pud size pfn. See vmf_insert_pfn() for additional info.
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*
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* Return: vm_fault_t value.
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*/
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static inline vm_fault_t vmf_insert_pfn_pud(struct vm_fault *vmf, pfn_t pfn,
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bool write)
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{
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return vmf_insert_pfn_pud_prot(vmf, pfn, vmf->vma->vm_page_prot, write);
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}
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enum transparent_hugepage_flag {
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TRANSPARENT_HUGEPAGE_NEVER_DAX,
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TRANSPARENT_HUGEPAGE_FLAG,
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TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
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TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
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TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
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TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG,
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TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
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TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
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TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
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#ifdef CONFIG_DEBUG_VM
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TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
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#endif
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#ifdef CONFIG_HUGETEXT
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TRANSPARENT_HUGEPAGE_FILE_TEXT_ENABLED_FLAG,
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TRANSPARENT_HUGEPAGE_ANON_TEXT_ENABLED_FLAG,
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TRANSPARENT_HUGEPAGE_FILE_TEXT_DIRECT_FLAG,
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#endif
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};
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#ifdef CONFIG_HUGETEXT
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#define BIT_SHIFT_THP_TEXT_FILE 0
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#define BIT_SHIFT_THP_TEXT_ANON 1
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#define BIT_SHIFT_THP_TEXT_FILE_DIRECT 2
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#define BIT_MASK_THP_TEXT_FILE (1 << BIT_SHIFT_THP_TEXT_FILE)
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#define BIT_MASK_THP_TEXT_ANON (1 << BIT_SHIFT_THP_TEXT_ANON)
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#define BIT_MASK_THP_TEXT_FILE_DIRECT (1 << BIT_SHIFT_THP_TEXT_FILE_DIRECT)
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#define BIT_MASK_THP_TEXT_ALL (BIT_MASK_THP_TEXT_FILE | \
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BIT_MASK_THP_TEXT_ANON | BIT_MASK_THP_TEXT_FILE_DIRECT)
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#endif
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struct kobject;
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struct kobj_attribute;
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ssize_t single_hugepage_flag_store(struct kobject *kobj,
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struct kobj_attribute *attr,
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const char *buf, size_t count,
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enum transparent_hugepage_flag flag);
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ssize_t single_hugepage_flag_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf,
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enum transparent_hugepage_flag flag);
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extern struct kobj_attribute shmem_enabled_attr;
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#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
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#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
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enum memcg_thp_flag {
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MEMCG_DISABLE_ANON_THP,
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MEMCG_DISABLE_SHMEM_THP,
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MEMCG_DISABLE_FILE_THP,
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NR_MEMCG_THP_FLAG,
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};
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#if defined(CONFIG_TRANSPARENT_HUGEPAGE) && defined(CONFIG_MEMCG)
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extern bool memcg_thp_control_test(struct mm_struct *mm,
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enum memcg_thp_flag flag);
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#else
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static inline bool memcg_thp_control_test(struct mm_struct *mm,
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enum memcg_thp_flag flag)
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{
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return false;
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}
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#endif
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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#define HPAGE_PMD_SHIFT PMD_SHIFT
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#define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
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#define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
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#define HPAGE_PUD_SHIFT PUD_SHIFT
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#define HPAGE_PUD_SIZE ((1UL) << HPAGE_PUD_SHIFT)
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#define HPAGE_PUD_MASK (~(HPAGE_PUD_SIZE - 1))
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extern unsigned long transparent_hugepage_flags;
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static inline bool memcg_transhuge_vma_enabled(struct vm_area_struct *vma)
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{
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struct mm_struct *mm = vma->vm_mm;
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if (vma_is_anonymous(vma))
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return !memcg_thp_control_test(mm, MEMCG_DISABLE_ANON_THP);
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if (vma_is_shmem(vma))
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return !memcg_thp_control_test(mm, MEMCG_DISABLE_SHMEM_THP);
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if (vma->vm_file)
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return !memcg_thp_control_test(mm, MEMCG_DISABLE_FILE_THP);
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return true;
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}
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static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
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unsigned long haddr)
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{
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/* Don't have to check pgoff for anonymous vma */
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if (!vma_is_anonymous(vma)) {
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if (!IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff,
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HPAGE_PMD_NR))
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return false;
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}
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if (haddr < vma->vm_start || haddr + HPAGE_PMD_SIZE > vma->vm_end)
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return false;
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return true;
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}
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static inline bool transhuge_vma_enabled(struct vm_area_struct *vma,
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unsigned long vm_flags)
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{
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/* Explicitly disabled through madvise. */
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if ((vm_flags & VM_NOHUGEPAGE) ||
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test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
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return false;
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if (!memcg_transhuge_vma_enabled(vma))
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return false;
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return true;
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}
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#ifdef CONFIG_HUGETEXT
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#define hugetext_enabled() \
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(transparent_hugepage_flags & \
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((1<<TRANSPARENT_HUGEPAGE_FILE_TEXT_ENABLED_FLAG) | \
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(1<<TRANSPARENT_HUGEPAGE_ANON_TEXT_ENABLED_FLAG)))
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#define hugetext_file_enabled() \
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(transparent_hugepage_flags & \
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(1<<TRANSPARENT_HUGEPAGE_FILE_TEXT_ENABLED_FLAG))
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#define hugetext_file_direct_enabled() \
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(transparent_hugepage_flags & \
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(1<<TRANSPARENT_HUGEPAGE_FILE_TEXT_DIRECT_FLAG))
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#define hugetext_anon_enabled() \
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(transparent_hugepage_flags & \
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(1<<TRANSPARENT_HUGEPAGE_ANON_TEXT_ENABLED_FLAG))
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extern unsigned long hugetext_pad_threshold;
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#define hugetext_padding_enabled() \
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(hugetext_file_enabled() && hugetext_pad_threshold > 0)
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extern inline bool adapt_hugetext_suitable(struct vm_area_struct *vma);
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extern inline bool __khugepaged_max_nr_hugetext(void);
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extern unsigned long hugetext_get_unmapped_area(struct file *filp,
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unsigned long addr, unsigned long len, unsigned long pgoff,
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unsigned long flags);
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extern void hugetext_add_file_collapse_work(unsigned long haddr);
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#else
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#define hugetext_enabled() false
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#define hugetext_file_enabled() false
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#define hugetext_file_direct_enabled() false
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#define hugetext_anon_enabled() false
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#define hugetext_padding_enabled() false
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static inline unsigned long hugetext_get_unmapped_area(struct file *filp,
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unsigned long addr, unsigned long len, unsigned long pgoff,
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unsigned long flags)
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{
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BUILD_BUG();
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return 0;
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}
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static inline void hugetext_add_file_collapse_work(unsigned long haddr) {}
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#endif /* CONFIG_HUGETEXT */
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static inline bool vma_is_hugetext_file(struct vm_area_struct *vma,
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unsigned long vm_flags)
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{
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if (!(vm_flags & VM_EXEC))
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return false;
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if (vma->vm_file && !inode_is_open_for_write(vma->vm_file->f_inode))
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return IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff,
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HPAGE_PMD_NR);
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return false;
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}
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static inline bool vma_is_hugetext_anon(struct vm_area_struct *vma,
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unsigned long vm_flags)
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{
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if (!(vm_flags & VM_EXEC))
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return false;
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if (vma_is_anonymous(vma))
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return true;
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return false;
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}
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static inline bool hugetext_vma_enabled(struct vm_area_struct *vma,
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unsigned long vm_flags)
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{
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if (!hugetext_enabled())
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return false;
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if (!(vm_flags & VM_EXEC))
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return false;
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if (hugetext_file_enabled() && vma_is_hugetext_file(vma, vm_flags)
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&& !memcg_thp_control_test(vma->vm_mm, MEMCG_DISABLE_FILE_THP))
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return true;
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if (hugetext_anon_enabled() && vma_is_hugetext_anon(vma, vm_flags)
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&& !memcg_thp_control_test(vma->vm_mm, MEMCG_DISABLE_ANON_THP))
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return true;
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return false;
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}
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/*
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* to be used on vmas which are known to support THP.
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* Use transparent_hugepage_active otherwise
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*/
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static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
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{
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/*
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* If the hardware/firmware marked hugepage support disabled.
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*/
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if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_NEVER_DAX))
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return false;
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if (!transhuge_vma_enabled(vma, vma->vm_flags))
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return false;
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if (vma_is_temporary_stack(vma))
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return false;
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#ifdef CONFIG_HUGETEXT
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if (hugetext_anon_enabled() &&
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vma_is_hugetext_anon(vma, vma->vm_flags)) {
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if (__khugepaged_max_nr_hugetext() &&
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adapt_hugetext_suitable(vma))
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return false;
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return true;
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}
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#endif
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if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_FLAG))
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return true;
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if (vma_is_dax(vma))
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return true;
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if (transparent_hugepage_flags &
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(1 << TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
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return !!(vma->vm_flags & VM_HUGEPAGE);
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return false;
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}
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bool transparent_hugepage_active(struct vm_area_struct *vma);
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#define transparent_hugepage_use_zero_page() \
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(transparent_hugepage_flags & \
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(1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
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unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr,
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unsigned long len, unsigned long pgoff, unsigned long flags);
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void prep_transhuge_page(struct page *page);
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void free_transhuge_page(struct page *page);
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bool is_transparent_hugepage(struct page *page);
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#ifdef CONFIG_MEMCG
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enum thp_reclaim_mode_item {
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THP_RECLAIM_DISABLE, /* disable mode */
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THP_RECLAIM_SWAP, /* swap mode */
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THP_RECLAIM_ZSR, /* reclaim mode, use zero subpages reclaim */
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THP_RECLAIM_MEMCG, /* For global configure */
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};
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#define HUGEPAGE_RECLAIM_STAT(stat) \
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atomic_long_t stat; \
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atomic_long_t total_##stat
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struct hugepage_reclaim {
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spinlock_t reclaim_queue_lock;
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struct list_head reclaim_queue;
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unsigned long queue_length;
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HUGEPAGE_RECLAIM_STAT(split_hugepage);
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HUGEPAGE_RECLAIM_STAT(reclaim_subpage);
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HUGEPAGE_RECLAIM_STAT(split_failed);
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};
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struct thp_reclaim_ctrl {
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int threshold;
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int proactive;
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};
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#define THP_RECLAIM_THRESHOLD_DEFAULT 16
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#define THP_RECLAIM_PROACTIVE_SLEEP_MS 60000
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extern int global_thp_reclaim;
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extern int thp_reclaim_proactive;
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int tr_get_hugepage(struct hugepage_reclaim *hr_queue, struct page **reclaim,
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int threshold, unsigned long time);
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unsigned long tr_reclaim_hugepage(struct hugepage_reclaim *hr_queue,
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struct lruvec *lruvec, struct page *page);
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void __tr_reclaim_memcg(struct mem_cgroup *memcg, unsigned long time,
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unsigned int scan, bool proactive);
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static inline void tr_reclaim_memcg(struct mem_cgroup *memcg)
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{
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__tr_reclaim_memcg(memcg, 0, 0, false);
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}
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static inline struct list_head *hugepage_reclaim_list(struct page *page)
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{
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return &page[3].hugepage_reclaim_list;
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}
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static inline unsigned long tr_hugepage_time(struct page *page)
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{
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return page[3].list_time;
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}
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static inline void tr_set_hugepage_time(struct page *page,
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unsigned long time)
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{
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page[3].list_time = time;
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}
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#endif
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bool can_split_huge_page(struct page *page, int *pextra_pins);
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int split_huge_page_to_list(struct page *page, struct list_head *list);
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static inline int split_huge_page(struct page *page)
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{
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return split_huge_page_to_list(page, NULL);
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}
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void deferred_split_huge_page(struct page *page);
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void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
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unsigned long address, bool freeze, struct page *page);
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#define split_huge_pmd(__vma, __pmd, __address) \
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do { \
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pmd_t *____pmd = (__pmd); \
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if (is_swap_pmd(*____pmd) || pmd_trans_huge(*____pmd) \
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|| pmd_devmap(*____pmd)) \
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__split_huge_pmd(__vma, __pmd, __address, \
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false, NULL); \
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} while (0)
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void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
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bool freeze, struct page *page);
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void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud,
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unsigned long address);
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#define split_huge_pud(__vma, __pud, __address) \
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do { \
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pud_t *____pud = (__pud); \
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if (pud_trans_huge(*____pud) \
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|| pud_devmap(*____pud)) \
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__split_huge_pud(__vma, __pud, __address); \
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} while (0)
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int hugepage_madvise(struct vm_area_struct *vma, unsigned long *vm_flags,
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int advice);
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void vma_adjust_trans_huge(struct vm_area_struct *vma, unsigned long start,
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unsigned long end, long adjust_next);
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spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma);
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spinlock_t *__pud_trans_huge_lock(pud_t *pud, struct vm_area_struct *vma);
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static inline int is_swap_pmd(pmd_t pmd)
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{
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return !pmd_none(pmd) && !pmd_present(pmd);
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}
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/* mmap_lock must be held on entry */
|
|
static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd) || pmd_devmap(*pmd))
|
|
return __pmd_trans_huge_lock(pmd, vma);
|
|
else
|
|
return NULL;
|
|
}
|
|
static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
if (pud_trans_huge(*pud) || pud_devmap(*pud))
|
|
return __pud_trans_huge_lock(pud, vma);
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* thp_head - Head page of a transparent huge page.
|
|
* @page: Any page (tail, head or regular) found in the page cache.
|
|
*/
|
|
static inline struct page *thp_head(struct page *page)
|
|
{
|
|
return compound_head(page);
|
|
}
|
|
|
|
/**
|
|
* thp_order - Order of a transparent huge page.
|
|
* @page: Head page of a transparent huge page.
|
|
*/
|
|
static inline unsigned int thp_order(struct page *page)
|
|
{
|
|
VM_BUG_ON_PGFLAGS(PageTail(page), page);
|
|
if (PageHead(page))
|
|
return HPAGE_PMD_ORDER;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* thp_nr_pages - The number of regular pages in this huge page.
|
|
* @page: The head page of a huge page.
|
|
*/
|
|
static inline int thp_nr_pages(struct page *page)
|
|
{
|
|
VM_BUG_ON_PGFLAGS(PageTail(page), page);
|
|
if (PageHead(page))
|
|
return HPAGE_PMD_NR;
|
|
return 1;
|
|
}
|
|
|
|
struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
|
|
pmd_t *pmd, int flags, struct dev_pagemap **pgmap);
|
|
struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr,
|
|
pud_t *pud, int flags, struct dev_pagemap **pgmap);
|
|
|
|
vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd);
|
|
|
|
extern struct page *huge_zero_page;
|
|
extern unsigned long huge_zero_pfn;
|
|
|
|
static inline bool is_huge_zero_page(struct page *page)
|
|
{
|
|
return READ_ONCE(huge_zero_page) == page;
|
|
}
|
|
|
|
static inline bool is_huge_zero_pmd(pmd_t pmd)
|
|
{
|
|
return READ_ONCE(huge_zero_pfn) == pmd_pfn(pmd) && pmd_present(pmd);
|
|
}
|
|
|
|
static inline bool is_huge_zero_pud(pud_t pud)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
struct page *mm_get_huge_zero_page(struct mm_struct *mm);
|
|
void mm_put_huge_zero_page(struct mm_struct *mm);
|
|
|
|
#define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
|
|
|
|
static inline bool thp_migration_supported(void)
|
|
{
|
|
return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
|
|
}
|
|
|
|
static inline struct list_head *page_deferred_list(struct page *page)
|
|
{
|
|
/*
|
|
* Global or memcg deferred list in the second tail pages is
|
|
* occupied by compound_head.
|
|
*/
|
|
return &page[2].deferred_list;
|
|
}
|
|
|
|
#else /* CONFIG_TRANSPARENT_HUGEPAGE */
|
|
#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
|
|
#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
|
|
#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
|
|
|
|
#define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
|
|
#define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
|
|
#define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
|
|
|
|
static inline struct page *thp_head(struct page *page)
|
|
{
|
|
VM_BUG_ON_PGFLAGS(PageTail(page), page);
|
|
return page;
|
|
}
|
|
|
|
static inline unsigned int thp_order(struct page *page)
|
|
{
|
|
VM_BUG_ON_PGFLAGS(PageTail(page), page);
|
|
return 0;
|
|
}
|
|
|
|
static inline int thp_nr_pages(struct page *page)
|
|
{
|
|
VM_BUG_ON_PGFLAGS(PageTail(page), page);
|
|
return 1;
|
|
}
|
|
|
|
static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline bool transparent_hugepage_active(struct vm_area_struct *vma)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
|
|
unsigned long haddr)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline bool transhuge_vma_enabled(struct vm_area_struct *vma,
|
|
unsigned long vm_flags)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline void prep_transhuge_page(struct page *page) {}
|
|
|
|
static inline bool is_transparent_hugepage(struct page *page)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
#define transparent_hugepage_flags 0UL
|
|
|
|
#define thp_get_unmapped_area NULL
|
|
|
|
static inline bool
|
|
can_split_huge_page(struct page *page, int *pextra_pins)
|
|
{
|
|
BUILD_BUG();
|
|
return false;
|
|
}
|
|
static inline int
|
|
split_huge_page_to_list(struct page *page, struct list_head *list)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline int split_huge_page(struct page *page)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void deferred_split_huge_page(struct page *page) {}
|
|
#define split_huge_pmd(__vma, __pmd, __address) \
|
|
do { } while (0)
|
|
|
|
static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
|
|
unsigned long address, bool freeze, struct page *page) {}
|
|
static inline void split_huge_pmd_address(struct vm_area_struct *vma,
|
|
unsigned long address, bool freeze, struct page *page) {}
|
|
|
|
#define split_huge_pud(__vma, __pmd, __address) \
|
|
do { } while (0)
|
|
|
|
static inline int hugepage_madvise(struct vm_area_struct *vma,
|
|
unsigned long *vm_flags, int advice)
|
|
{
|
|
BUG();
|
|
return 0;
|
|
}
|
|
static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
|
|
unsigned long start,
|
|
unsigned long end,
|
|
long adjust_next)
|
|
{
|
|
}
|
|
static inline int is_swap_pmd(pmd_t pmd)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
return NULL;
|
|
}
|
|
static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf,
|
|
pmd_t orig_pmd)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline bool is_huge_zero_page(struct page *page)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline bool is_huge_zero_pmd(pmd_t pmd)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline bool is_huge_zero_pud(pud_t pud)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline void mm_put_huge_zero_page(struct mm_struct *mm)
|
|
{
|
|
return;
|
|
}
|
|
|
|
static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
|
|
unsigned long addr, pmd_t *pmd, int flags, struct dev_pagemap **pgmap)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline struct page *follow_devmap_pud(struct vm_area_struct *vma,
|
|
unsigned long addr, pud_t *pud, int flags, struct dev_pagemap **pgmap)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline bool thp_migration_supported(void)
|
|
{
|
|
return false;
|
|
}
|
|
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
|
|
|
|
/**
|
|
* thp_size - Size of a transparent huge page.
|
|
* @page: Head page of a transparent huge page.
|
|
*
|
|
* Return: Number of bytes in this page.
|
|
*/
|
|
static inline unsigned long thp_size(struct page *page)
|
|
{
|
|
return PAGE_SIZE << thp_order(page);
|
|
}
|
|
|
|
#endif /* _LINUX_HUGE_MM_H */
|