extern void * high_memory;
extern int page_cluster;
+extern const int page_cluster_max;
#ifdef CONFIG_SYSCTL
extern int sysctl_legacy_va_layout;
/*
* Called by mprotect() to make driver-specific permission
* checks before mprotect() is finalised. The VMA must not
- * be modified. Returns 0 if eprotect() can proceed.
+ * be modified. Returns 0 if mprotect() can proceed.
*/
int (*mprotect)(struct vm_area_struct *vma, unsigned long start,
unsigned long end, unsigned long newflags);
* paths in userfault.
*/
bool vma_is_shmem(struct vm_area_struct *vma);
+bool vma_is_anon_shmem(struct vm_area_struct *vma);
#else
static inline bool vma_is_shmem(struct vm_area_struct *vma) { return false; }
+static inline bool vma_is_anon_shmem(struct vm_area_struct *vma) { return false; }
#endif
int vma_is_stack_for_current(struct vm_area_struct *vma);
/*
* How many times the entire folio is mapped as a single unit (eg by a
* PMD or PUD entry). This is probably not what you want, except for
- * debugging purposes; look at folio_mapcount() or page_mapcount()
- * instead.
+ * debugging purposes - it does not include PTE-mapped sub-pages; look
+ * at folio_mapcount() or page_mapcount() or total_mapcount() instead.
*/
static inline int folio_entire_mapcount(struct folio *folio)
{
/*
* Mapcount of compound page as a whole, does not include mapped sub-pages.
- *
- * Must be called only for compound pages.
+ * Must be called only on head of compound page.
*/
-static inline int compound_mapcount(struct page *page)
+static inline int head_compound_mapcount(struct page *head)
{
- return folio_entire_mapcount(page_folio(page));
+ return atomic_read(compound_mapcount_ptr(head)) + 1;
+}
+
+/*
+ * If a 16GB hugetlb page were mapped by PTEs of all of its 4kB sub-pages,
+ * its subpages_mapcount would be 0x400000: choose the COMPOUND_MAPPED bit
+ * above that range, instead of 2*(PMD_SIZE/PAGE_SIZE). Hugetlb currently
+ * leaves subpages_mapcount at 0, but avoid surprise if it participates later.
+ */
+#define COMPOUND_MAPPED 0x800000
+#define SUBPAGES_MAPPED (COMPOUND_MAPPED - 1)
+
+/*
+ * Number of sub-pages mapped by PTE, does not include compound mapcount.
+ * Must be called only on head of compound page.
+ */
+static inline int head_subpages_mapcount(struct page *head)
+{
+ return atomic_read(subpages_mapcount_ptr(head)) & SUBPAGES_MAPPED;
}
/*
atomic_set(&(page)->_mapcount, -1);
}
-int __page_mapcount(struct page *page);
-
/*
* Mapcount of 0-order page; when compound sub-page, includes
- * compound_mapcount().
+ * compound_mapcount of compound_head of page.
*
* Result is undefined for pages which cannot be mapped into userspace.
* For example SLAB or special types of pages. See function page_has_type().
*/
static inline int page_mapcount(struct page *page)
{
- if (unlikely(PageCompound(page)))
- return __page_mapcount(page);
- return atomic_read(&page->_mapcount) + 1;
+ int mapcount = atomic_read(&page->_mapcount) + 1;
+
+ if (likely(!PageCompound(page)))
+ return mapcount;
+ page = compound_head(page);
+ return head_compound_mapcount(page) + mapcount;
}
-int folio_mapcount(struct folio *folio);
+int total_compound_mapcount(struct page *head);
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-static inline int total_mapcount(struct page *page)
+/**
+ * folio_mapcount() - Calculate the number of mappings of this folio.
+ * @folio: The folio.
+ *
+ * A large folio tracks both how many times the entire folio is mapped,
+ * and how many times each individual page in the folio is mapped.
+ * This function calculates the total number of times the folio is
+ * mapped.
+ *
+ * Return: The number of times this folio is mapped.
+ */
+static inline int folio_mapcount(struct folio *folio)
{
- return folio_mapcount(page_folio(page));
+ if (likely(!folio_test_large(folio)))
+ return atomic_read(&folio->_mapcount) + 1;
+ return total_compound_mapcount(&folio->page);
}
-#else
static inline int total_mapcount(struct page *page)
{
- return page_mapcount(page);
+ if (likely(!PageCompound(page)))
+ return atomic_read(&page->_mapcount) + 1;
+ return total_compound_mapcount(compound_head(page));
+}
+
+static inline bool folio_large_is_mapped(struct folio *folio)
+{
+ /*
+ * Reading folio_mapcount_ptr() below could be omitted if hugetlb
+ * participated in incrementing subpages_mapcount when compound mapped.
+ */
+ return atomic_read(folio_subpages_mapcount_ptr(folio)) > 0 ||
+ atomic_read(folio_mapcount_ptr(folio)) >= 0;
+}
+
+/**
+ * folio_mapped - Is this folio mapped into userspace?
+ * @folio: The folio.
+ *
+ * Return: True if any page in this folio is referenced by user page tables.
+ */
+static inline bool folio_mapped(struct folio *folio)
+{
+ if (likely(!folio_test_large(folio)))
+ return atomic_read(&folio->_mapcount) >= 0;
+ return folio_large_is_mapped(folio);
+}
+
+/*
+ * Return true if this page is mapped into pagetables.
+ * For compound page it returns true if any sub-page of compound page is mapped,
+ * even if this particular sub-page is not itself mapped by any PTE or PMD.
+ */
+static inline bool page_mapped(struct page *page)
+{
+ if (likely(!PageCompound(page)))
+ return atomic_read(&page->_mapcount) >= 0;
+ return folio_large_is_mapped(page_folio(page));
}
-#endif
static inline struct page *virt_to_head_page(const void *x)
{
page[1].compound_dtor = compound_dtor;
}
+static inline void folio_set_compound_dtor(struct folio *folio,
+ enum compound_dtor_id compound_dtor)
+{
+ VM_BUG_ON_FOLIO(compound_dtor >= NR_COMPOUND_DTORS, folio);
+ folio->_folio_dtor = compound_dtor;
+}
+
void destroy_large_folio(struct folio *folio);
static inline int head_compound_pincount(struct page *head)
#endif
}
+/*
+ * folio_set_compound_order is generally passed a non-zero order to
+ * initialize a large folio. However, hugetlb code abuses this by
+ * passing in zero when 'dissolving' a large folio.
+ */
+static inline void folio_set_compound_order(struct folio *folio,
+ unsigned int order)
+{
+ VM_BUG_ON_FOLIO(!folio_test_large(folio), folio);
+
+ folio->_folio_order = order;
+#ifdef CONFIG_64BIT
+ folio->_folio_nr_pages = order ? 1U << order : 0;
+#endif
+}
+
/* Returns the number of pages in this potentially compound page. */
static inline unsigned long compound_nr(struct page *page)
{
folio_get(page_folio(page));
}
-bool __must_check try_grab_page(struct page *page, unsigned int flags);
+int __must_check try_grab_page(struct page *page, unsigned int flags);
static inline __must_check bool try_get_page(struct page *page)
{
__folio_put(folio);
}
-void release_pages(struct page **pages, int nr);
+/**
+ * release_pages - release an array of pages or folios
+ *
+ * This just releases a simple array of multiple pages, and
+ * accepts various different forms of said page array: either
+ * a regular old boring array of pages, an array of folios, or
+ * an array of encoded page pointers.
+ *
+ * The transparent union syntax for this kind of "any of these
+ * argument types" is all kinds of ugly, so look away.
+ */
+typedef union {
+ struct page **pages;
+ struct folio **folios;
+ struct encoded_page **encoded_pages;
+} release_pages_arg __attribute__ ((__transparent_union__));
+
+void release_pages(release_pages_arg, int nr);
/**
* folios_put - Decrement the reference count on an array of folios.
*/
static inline void folios_put(struct folio **folios, unsigned int nr)
{
- release_pages((struct page **)folios, nr);
+ release_pages(folios, nr);
}
static inline void put_page(struct page *page)
return page->index;
}
-bool page_mapped(struct page *page);
-bool folio_mapped(struct folio *folio);
-
/*
* Return true only if the page has been allocated with
* ALLOC_NO_WATERMARKS and the low watermark was not
__show_free_areas(flags, nodemask, MAX_NR_ZONES - 1);
}
+/*
+ * Parameter block passed down to zap_pte_range in exceptional cases.
+ */
+struct zap_details {
+ struct folio *single_folio; /* Locked folio to be unmapped */
+ bool even_cows; /* Zap COWed private pages too? */
+ zap_flags_t zap_flags; /* Extra flags for zapping */
+};
+
+/*
+ * Whether to drop the pte markers, for example, the uffd-wp information for
+ * file-backed memory. This should only be specified when we will completely
+ * drop the page in the mm, either by truncation or unmapping of the vma. By
+ * default, the flag is not set.
+ */
+#define ZAP_FLAG_DROP_MARKER ((__force zap_flags_t) BIT(0))
+/* Set in unmap_vmas() to indicate a final unmap call. Only used by hugetlb */
+#define ZAP_FLAG_UNMAP ((__force zap_flags_t) BIT(1))
+
#ifdef CONFIG_MMU
extern bool can_do_mlock(void);
#else
unsigned long size);
void zap_page_range(struct vm_area_struct *vma, unsigned long address,
unsigned long size);
+void zap_page_range_single(struct vm_area_struct *vma, unsigned long address,
+ unsigned long size, struct zap_details *details);
void unmap_vmas(struct mmu_gather *tlb, struct maple_tree *mt,
struct vm_area_struct *start_vma, unsigned long start,
unsigned long end);
#define MM_CP_UFFD_WP_ALL (MM_CP_UFFD_WP | \
MM_CP_UFFD_WP_RESOLVE)
+int vma_wants_writenotify(struct vm_area_struct *vma, pgprot_t vm_page_prot);
+static inline bool vma_wants_manual_pte_write_upgrade(struct vm_area_struct *vma)
+{
+ /*
+ * We want to check manually if we can change individual PTEs writable
+ * if we can't do that automatically for all PTEs in a mapping. For
+ * private mappings, that's always the case when we have write
+ * permissions as we properly have to handle COW.
+ */
+ if (vma->vm_flags & VM_SHARED)
+ return vma_wants_writenotify(vma, vma->vm_page_prot);
+ return !!(vma->vm_flags & VM_WRITE);
+
+}
+bool can_change_pte_writable(struct vm_area_struct *vma, unsigned long addr,
+ pte_t pte);
extern unsigned long change_protection(struct mmu_gather *tlb,
struct vm_area_struct *vma, unsigned long start,
unsigned long end, pgprot_t newprot,
*/
static inline unsigned long get_mm_counter(struct mm_struct *mm, int member)
{
- long val = atomic_long_read(&mm->rss_stat.count[member]);
-
-#ifdef SPLIT_RSS_COUNTING
- /*
- * counter is updated in asynchronous manner and may go to minus.
- * But it's never be expected number for users.
- */
- if (val < 0)
- val = 0;
-#endif
- return (unsigned long)val;
+ return percpu_counter_read_positive(&mm->rss_stat[member]);
}
-void mm_trace_rss_stat(struct mm_struct *mm, int member, long count);
+void mm_trace_rss_stat(struct mm_struct *mm, int member);
static inline void add_mm_counter(struct mm_struct *mm, int member, long value)
{
- long count = atomic_long_add_return(value, &mm->rss_stat.count[member]);
+ percpu_counter_add(&mm->rss_stat[member], value);
- mm_trace_rss_stat(mm, member, count);
+ mm_trace_rss_stat(mm, member);
}
static inline void inc_mm_counter(struct mm_struct *mm, int member)
{
- long count = atomic_long_inc_return(&mm->rss_stat.count[member]);
+ percpu_counter_inc(&mm->rss_stat[member]);
- mm_trace_rss_stat(mm, member, count);
+ mm_trace_rss_stat(mm, member);
}
static inline void dec_mm_counter(struct mm_struct *mm, int member)
{
- long count = atomic_long_dec_return(&mm->rss_stat.count[member]);
+ percpu_counter_dec(&mm->rss_stat[member]);
- mm_trace_rss_stat(mm, member, count);
+ mm_trace_rss_stat(mm, member);
}
/* Optimized variant when page is already known not to be PageAnon */
}
#endif
-int vma_wants_writenotify(struct vm_area_struct *vma, pgprot_t vm_page_prot);
-
extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr,
spinlock_t **ptl);
static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr,
#if USE_SPLIT_PMD_PTLOCKS
-static struct page *pmd_to_page(pmd_t *pmd)
+static inline struct page *pmd_pgtable_page(pmd_t *pmd)
{
unsigned long mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1);
return virt_to_page((void *)((unsigned long) pmd & mask));
static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd)
{
- return ptlock_ptr(pmd_to_page(pmd));
+ return ptlock_ptr(pmd_pgtable_page(pmd));
}
static inline bool pmd_ptlock_init(struct page *page)
ptlock_free(page);
}
-#define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte)
+#define pmd_huge_pte(mm, pmd) (pmd_pgtable_page(pmd)->pmd_huge_pte)
#else
* and return without waiting upon it */
#define FOLL_NOFAULT 0x80 /* do not fault in pages */
#define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */
-#define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */
#define FOLL_TRIED 0x800 /* a retry, previous pass started an IO */
#define FOLL_REMOTE 0x2000 /* we are working on non-current tsk/mm */
#define FOLL_ANON 0x8000 /* don't do file mappings */
#define FOLL_SPLIT_PMD 0x20000 /* split huge pmd before returning */
#define FOLL_PIN 0x40000 /* pages must be released via unpin_user_page */
#define FOLL_FAST_ONLY 0x80000 /* gup_fast: prevent fall-back to slow gup */
+#define FOLL_PCI_P2PDMA 0x100000 /* allow returning PCI P2PDMA pages */
+#define FOLL_INTERRUPTIBLE 0x200000 /* allow interrupts from generic signals */
/*
* FOLL_PIN and FOLL_LONGTERM may be used in various combinations with each
* Must be called with the (sub)page that's actually referenced via the
* page table entry, which might not necessarily be the head page for a
* PTE-mapped THP.
+ *
+ * If the vma is NULL, we're coming from the GUP-fast path and might have
+ * to fallback to the slow path just to lookup the vma.
*/
-static inline bool gup_must_unshare(unsigned int flags, struct page *page)
+static inline bool gup_must_unshare(struct vm_area_struct *vma,
+ unsigned int flags, struct page *page)
{
/*
* FOLL_WRITE is implicitly handled correctly as the page table entry
* Note: PageAnon(page) is stable until the page is actually getting
* freed.
*/
- if (!PageAnon(page))
- return false;
+ if (!PageAnon(page)) {
+ /*
+ * We only care about R/O long-term pining: R/O short-term
+ * pinning does not have the semantics to observe successive
+ * changes through the process page tables.
+ */
+ if (!(flags & FOLL_LONGTERM))
+ return false;
+
+ /* We really need the vma ... */
+ if (!vma)
+ return true;
+
+ /*
+ * ... because we only care about writable private ("COW")
+ * mappings where we have to break COW early.
+ */
+ return is_cow_mapping(vma->vm_flags);
+ }
/* Paired with a memory barrier in page_try_share_anon_rmap(). */
if (IS_ENABLED(CONFIG_HAVE_FAST_GUP))
struct page * __populate_section_memmap(unsigned long pfn,
unsigned long nr_pages, int nid, struct vmem_altmap *altmap,
struct dev_pagemap *pgmap);
+void pmd_init(void *addr);
+void pud_init(void *addr);
pgd_t *vmemmap_pgd_populate(unsigned long addr, int node);
p4d_t *vmemmap_p4d_populate(pgd_t *pgd, unsigned long addr, int node);
pud_t *vmemmap_pud_populate(p4d_t *p4d, unsigned long addr, int node);
void *vmemmap_alloc_block_buf(unsigned long size, int node,
struct vmem_altmap *altmap);
void vmemmap_verify(pte_t *, int, unsigned long, unsigned long);
+void vmemmap_set_pmd(pmd_t *pmd, void *p, int node,
+ unsigned long addr, unsigned long next);
+int vmemmap_check_pmd(pmd_t *pmd, int node,
+ unsigned long addr, unsigned long next);
int vmemmap_populate_basepages(unsigned long start, unsigned long end,
int node, struct vmem_altmap *altmap);
+int vmemmap_populate_hugepages(unsigned long start, unsigned long end,
+ int node, struct vmem_altmap *altmap);
int vmemmap_populate(unsigned long start, unsigned long end, int node,
struct vmem_altmap *altmap);
void vmemmap_populate_print_last(void);
int mf_dax_kill_procs(struct address_space *mapping, pgoff_t index,
unsigned long count, int mf_flags);
extern int memory_failure(unsigned long pfn, int flags);
-extern void memory_failure_queue(unsigned long pfn, int flags);
extern void memory_failure_queue_kick(int cpu);
extern int unpoison_memory(unsigned long pfn);
extern int sysctl_memory_failure_early_kill;
extern atomic_long_t num_poisoned_pages __read_mostly;
extern int soft_offline_page(unsigned long pfn, int flags);
#ifdef CONFIG_MEMORY_FAILURE
-extern int __get_huge_page_for_hwpoison(unsigned long pfn, int flags);
+extern void memory_failure_queue(unsigned long pfn, int flags);
+extern int __get_huge_page_for_hwpoison(unsigned long pfn, int flags,
+ bool *migratable_cleared);
+void num_poisoned_pages_inc(unsigned long pfn);
+void num_poisoned_pages_sub(unsigned long pfn, long i);
#else
-static inline int __get_huge_page_for_hwpoison(unsigned long pfn, int flags)
+static inline void memory_failure_queue(unsigned long pfn, int flags)
+{
+}
+
+static inline int __get_huge_page_for_hwpoison(unsigned long pfn, int flags,
+ bool *migratable_cleared)
{
return 0;
}
+
+static inline void num_poisoned_pages_inc(unsigned long pfn)
+{
+}
+
+static inline void num_poisoned_pages_sub(unsigned long pfn, long i)
+{
+}
+#endif
+
+#if defined(CONFIG_MEMORY_FAILURE) && defined(CONFIG_MEMORY_HOTPLUG)
+extern void memblk_nr_poison_inc(unsigned long pfn);
+extern void memblk_nr_poison_sub(unsigned long pfn, long i);
+#else
+static inline void memblk_nr_poison_inc(unsigned long pfn)
+{
+}
+
+static inline void memblk_nr_poison_sub(unsigned long pfn, long i)
+{
+}
#endif
#ifndef arch_memory_failure
}
#endif
-/*
- * Whether to drop the pte markers, for example, the uffd-wp information for
- * file-backed memory. This should only be specified when we will completely
- * drop the page in the mm, either by truncation or unmapping of the vma. By
- * default, the flag is not set.
- */
-#define ZAP_FLAG_DROP_MARKER ((__force zap_flags_t) BIT(0))
-
#endif /* _LINUX_MM_H */
git.samba.org / sfrench / cifs-2.6.git / blobdiff