mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

18 hotfixes. 13 are cc:stable and the remainder pertain to post-6.4 issues 

or aren't considered suitable for a -stable backport.
 -----BEGIN PGP SIGNATURE-----
 
 iHUEABYIAB0WIQTTMBEPP41GrTpTJgfdBJ7gKXxAjgUCZOjuGgAKCRDdBJ7gKXxA
 jkLlAQDY9sYxhQZp1PFLirUIPeOBjEyifVy6L6gCfk9j0snLggEA2iK+EtuJt2Dc
 SlMfoTq29zyU/YgfKKwZEVKtPJZOHQU=
 =oTcj
 -----END PGP SIGNATURE-----

Merge tag 'mm-hotfixes-stable-2023-08-25-11-07' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull misc fixes from Andrew Morton:
 "18 hotfixes. 13 are cc:stable and the remainder pertain to post-6.4
  issues or aren't considered suitable for a -stable backport"

* tag 'mm-hotfixes-stable-2023-08-25-11-07' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
  shmem: fix smaps BUG sleeping while atomic
  selftests: cachestat: catch failing fsync test on tmpfs
  selftests: cachestat: test for cachestat availability
  maple_tree: disable mas_wr_append() when other readers are possible
  madvise:madvise_free_pte_range(): don't use mapcount() against large folio for sharing check
  madvise:madvise_free_huge_pmd(): don't use mapcount() against large folio for sharing check
  madvise:madvise_cold_or_pageout_pte_range(): don't use mapcount() against large folio for sharing check
  mm: multi-gen LRU: don't spin during memcg release
  mm: memory-failure: fix unexpected return value in soft_offline_page()
  radix tree: remove unused variable
  mm: add a call to flush_cache_vmap() in vmap_pfn()
  selftests/mm: FOLL_LONGTERM need to be updated to 0x100
  nilfs2: fix general protection fault in nilfs_lookup_dirty_data_buffers()
  mm/gup: handle cont-PTE hugetlb pages correctly in gup_must_unshare() via GUP-fast
  selftests: cgroup: fix test_kmem_basic less than error
  mm: enable page walking API to lock vmas during the walk
  smaps: use vm_normal_page_pmd() instead of follow_trans_huge_pmd()
  mm/gup: reintroduce FOLL_NUMA as FOLL_HONOR_NUMA_FAULT
This commit is contained in:
Linus Torvalds 2023-08-25 11:44:43 -07:00
parent 4942fed84b e5548f85b4
commit 6f0edbb833
32 changed files with 280 additions and 74 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/powerpc/mm/book3s64/subpage_prot.c
View File

@ -145,6 +145,7 @@ static int subpage_walk_pmd_entry(pmd_t *pmd, unsigned long addr,
static const struct mm_walk_ops subpage_walk_ops = {
.pmd_entry = subpage_walk_pmd_entry,
.walk_lock = PGWALK_WRLOCK_VERIFY,
};
static void subpage_mark_vma_nohuge(struct mm_struct *mm, unsigned long addr,

1
arch/riscv/mm/pageattr.c
View File

@ -102,6 +102,7 @@ static const struct mm_walk_ops pageattr_ops = {
.pmd_entry = pageattr_pmd_entry,
.pte_entry = pageattr_pte_entry,
.pte_hole = pageattr_pte_hole,
.walk_lock = PGWALK_RDLOCK,
};
static int __set_memory(unsigned long addr, int numpages, pgprot_t set_mask,

5
arch/s390/mm/gmap.c
View File

@ -2514,6 +2514,7 @@ static int thp_split_walk_pmd_entry(pmd_t *pmd, unsigned long addr,
static const struct mm_walk_ops thp_split_walk_ops = {
.pmd_entry = thp_split_walk_pmd_entry,
.walk_lock = PGWALK_WRLOCK_VERIFY,
};
static inline void thp_split_mm(struct mm_struct *mm)
@ -2565,6 +2566,7 @@ static int __zap_zero_pages(pmd_t *pmd, unsigned long start,
static const struct mm_walk_ops zap_zero_walk_ops = {
.pmd_entry = __zap_zero_pages,
.walk_lock = PGWALK_WRLOCK,
};
/*
@ -2655,6 +2657,7 @@ static const struct mm_walk_ops enable_skey_walk_ops = {
.hugetlb_entry = __s390_enable_skey_hugetlb,
.pte_entry = __s390_enable_skey_pte,
.pmd_entry = __s390_enable_skey_pmd,
.walk_lock = PGWALK_WRLOCK,
};
int s390_enable_skey(void)
@ -2692,6 +2695,7 @@ static int __s390_reset_cmma(pte_t *pte, unsigned long addr,
static const struct mm_walk_ops reset_cmma_walk_ops = {
.pte_entry = __s390_reset_cmma,
.walk_lock = PGWALK_WRLOCK,
};
void s390_reset_cmma(struct mm_struct *mm)
@ -2728,6 +2732,7 @@ static int s390_gather_pages(pte_t *ptep, unsigned long addr,
static const struct mm_walk_ops gather_pages_ops = {
.pte_entry = s390_gather_pages,
.walk_lock = PGWALK_RDLOCK,
};
/*

5
fs/nilfs2/segment.c
View File

@ -725,6 +725,11 @@ static size_t nilfs_lookup_dirty_data_buffers(struct inode *inode,
struct folio *folio = fbatch.folios[i];
folio_lock(folio);
if (unlikely(folio->mapping != mapping)) {
/* Exclude folios removed from the address space */
folio_unlock(folio);
continue;
}
head = folio_buffers(folio);
if (!head) {
create_empty_buffers(&folio->page, i_blocksize(inode), 0);

8
fs/proc/task_mmu.c
View File

@ -587,8 +587,7 @@ static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr,
bool migration = false;
if (pmd_present(*pmd)) {
/* FOLL_DUMP will return -EFAULT on huge zero page */
page = follow_trans_huge_pmd(vma, addr, pmd, FOLL_DUMP);
page = vm_normal_page_pmd(vma, addr, *pmd);
} else if (unlikely(thp_migration_supported() && is_swap_pmd(*pmd))) {
swp_entry_t entry = pmd_to_swp_entry(*pmd);
@ -758,12 +757,14 @@ static int smaps_hugetlb_range(pte_t *pte, unsigned long hmask,
static const struct mm_walk_ops smaps_walk_ops = {
.pmd_entry = smaps_pte_range,
.hugetlb_entry = smaps_hugetlb_range,
.walk_lock = PGWALK_RDLOCK,
};
static const struct mm_walk_ops smaps_shmem_walk_ops = {
.pmd_entry = smaps_pte_range,
.hugetlb_entry = smaps_hugetlb_range,
.pte_hole = smaps_pte_hole,
.walk_lock = PGWALK_RDLOCK,
};
/*
@ -1245,6 +1246,7 @@ static int clear_refs_test_walk(unsigned long start, unsigned long end,
static const struct mm_walk_ops clear_refs_walk_ops = {
.pmd_entry = clear_refs_pte_range,
.test_walk = clear_refs_test_walk,
.walk_lock = PGWALK_WRLOCK,
};
static ssize_t clear_refs_write(struct file *file, const char __user *buf,
@ -1622,6 +1624,7 @@ static const struct mm_walk_ops pagemap_ops = {
.pmd_entry = pagemap_pmd_range,
.pte_hole = pagemap_pte_hole,
.hugetlb_entry = pagemap_hugetlb_range,
.walk_lock = PGWALK_RDLOCK,
};
/*
@ -1935,6 +1938,7 @@ static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask,
static const struct mm_walk_ops show_numa_ops = {
.hugetlb_entry = gather_hugetlb_stats,
.pmd_entry = gather_pte_stats,
.walk_lock = PGWALK_RDLOCK,
};
/*

3
include/linux/huge_mm.h
View File

@ -25,9 +25,6 @@ static inline void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud)
#endif
vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf);
struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
unsigned long addr, pmd_t *pmd,
unsigned int flags);
bool madvise_free_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
pmd_t *pmd, unsigned long addr, unsigned long next);
int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma, pmd_t *pmd,

21
include/linux/mm.h
View File

@ -3421,15 +3421,24 @@ static inline int vm_fault_to_errno(vm_fault_t vm_fault, int foll_flags)
* Indicates whether GUP can follow a PROT_NONE mapped page, or whether
* a (NUMA hinting) fault is required.
*/
static inline bool gup_can_follow_protnone(unsigned int flags)
static inline bool gup_can_follow_protnone(struct vm_area_struct *vma,
unsigned int flags)
{
/*
* FOLL_FORCE has to be able to make progress even if the VMA is
* inaccessible. Further, FOLL_FORCE access usually does not represent
* application behaviour and we should avoid triggering NUMA hinting
* faults.
* If callers don't want to honor NUMA hinting faults, no need to
* determine if we would actually have to trigger a NUMA hinting fault.
*/
return flags & FOLL_FORCE;
if (!(flags & FOLL_HONOR_NUMA_FAULT))
return true;
/*
* NUMA hinting faults don't apply in inaccessible (PROT_NONE) VMAs.
*
* Requiring a fault here even for inaccessible VMAs would mean that
* FOLL_FORCE cannot make any progress, because handle_mm_fault()
* refuses to process NUMA hinting faults in inaccessible VMAs.
*/
return !vma_is_accessible(vma);
}
typedef int (*pte_fn_t)(pte_t *pte, unsigned long addr, void *data);

9
include/linux/mm_types.h
View File

@ -1286,6 +1286,15 @@ enum {
FOLL_PCI_P2PDMA = 1 << 10,
/* allow interrupts from generic signals */
FOLL_INTERRUPTIBLE = 1 << 11,
/*
* Always honor (trigger) NUMA hinting faults.
*
* FOLL_WRITE implicitly honors NUMA hinting faults because a
* PROT_NONE-mapped page is not writable (exceptions with FOLL_FORCE
* apply). get_user_pages_fast_only() always implicitly honors NUMA
* hinting faults.
*/
FOLL_HONOR_NUMA_FAULT = 1 << 12,
/* See also internal only FOLL flags in mm/internal.h */
};

11
include/linux/pagewalk.h
View File

@ -6,6 +6,16 @@
struct mm_walk;
/* Locking requirement during a page walk. */
enum page_walk_lock {
/* mmap_lock should be locked for read to stabilize the vma tree */
PGWALK_RDLOCK = 0,
/* vma will be write-locked during the walk */
PGWALK_WRLOCK = 1,
/* vma is expected to be already write-locked during the walk */
PGWALK_WRLOCK_VERIFY = 2,
};
/**
* struct mm_walk_ops - callbacks for walk_page_range
* @pgd_entry: if set, called for each non-empty PGD (top-level) entry
@ -66,6 +76,7 @@ struct mm_walk_ops {
int (*pre_vma)(unsigned long start, unsigned long end,
struct mm_walk *walk);
void (*post_vma)(struct mm_walk *walk);
enum page_walk_lock walk_lock;
};
/*

7
lib/maple_tree.c
View File

@ -4265,6 +4265,10 @@ static inline unsigned char mas_wr_new_end(struct ma_wr_state *wr_mas)
* mas_wr_append: Attempt to append
* @wr_mas: the maple write state
*
* This is currently unsafe in rcu mode since the end of the node may be cached
* by readers while the node contents may be updated which could result in
* inaccurate information.
*
* Return: True if appended, false otherwise
*/
static inline bool mas_wr_append(struct ma_wr_state *wr_mas)
@ -4274,6 +4278,9 @@ static inline bool mas_wr_append(struct ma_wr_state *wr_mas)
struct ma_state *mas = wr_mas->mas;
unsigned char node_pivots = mt_pivots[wr_mas->type];
if (mt_in_rcu(mas->tree))
return false;
if (mas->offset != wr_mas->node_end)
return false;

1
lib/radix-tree.c
View File

@ -1136,7 +1136,6 @@ static void set_iter_tags(struct radix_tree_iter *iter,
void __rcu **radix_tree_iter_resume(void __rcu **slot,
struct radix_tree_iter *iter)
{
slot++;
iter->index = __radix_tree_iter_add(iter, 1);
iter->next_index = iter->index;
iter->tags = 0;

2
mm/damon/vaddr.c
View File

@ -386,6 +386,7 @@ out:
static const struct mm_walk_ops damon_mkold_ops = {
.pmd_entry = damon_mkold_pmd_entry,
.hugetlb_entry = damon_mkold_hugetlb_entry,
.walk_lock = PGWALK_RDLOCK,
};
static void damon_va_mkold(struct mm_struct *mm, unsigned long addr)
@ -525,6 +526,7 @@ out:
static const struct mm_walk_ops damon_young_ops = {
.pmd_entry = damon_young_pmd_entry,
.hugetlb_entry = damon_young_hugetlb_entry,
.walk_lock = PGWALK_RDLOCK,
};
static bool damon_va_young(struct mm_struct *mm, unsigned long addr,

30
mm/gup.c
View File

@ -597,7 +597,7 @@ static struct page *follow_page_pte(struct vm_area_struct *vma,
pte = ptep_get(ptep);
if (!pte_present(pte))
goto no_page;
if (pte_protnone(pte) && !gup_can_follow_protnone(flags))
if (pte_protnone(pte) && !gup_can_follow_protnone(vma, flags))
goto no_page;
page = vm_normal_page(vma, address, pte);
@ -714,7 +714,7 @@ static struct page *follow_pmd_mask(struct vm_area_struct *vma,
if (likely(!pmd_trans_huge(pmdval)))
return follow_page_pte(vma, address, pmd, flags, &ctx->pgmap);
if (pmd_protnone(pmdval) && !gup_can_follow_protnone(flags))
if (pmd_protnone(pmdval) && !gup_can_follow_protnone(vma, flags))
return no_page_table(vma, flags);
ptl = pmd_lock(mm, pmd);
@ -851,6 +851,10 @@ struct page *follow_page(struct vm_area_struct *vma, unsigned long address,
if (WARN_ON_ONCE(foll_flags & FOLL_PIN))
return NULL;
/*
* We never set FOLL_HONOR_NUMA_FAULT because callers don't expect
* to fail on PROT_NONE-mapped pages.
*/
page = follow_page_mask(vma, address, foll_flags, &ctx);
if (ctx.pgmap)
put_dev_pagemap(ctx.pgmap);
@ -2227,6 +2231,13 @@ static bool is_valid_gup_args(struct page **pages, int *locked,
gup_flags |= FOLL_UNLOCKABLE;
}
/*
* For now, always trigger NUMA hinting faults. Some GUP users like
* KVM require the hint to be as the calling context of GUP is
* functionally similar to a memory reference from task context.
*/
gup_flags |= FOLL_HONOR_NUMA_FAULT;
/* FOLL_GET and FOLL_PIN are mutually exclusive. */
if (WARN_ON_ONCE((gup_flags & (FOLL_PIN | FOLL_GET)) ==
(FOLL_PIN | FOLL_GET)))
@ -2551,7 +2562,14 @@ static int gup_pte_range(pmd_t pmd, pmd_t *pmdp, unsigned long addr,
struct page *page;
struct folio *folio;
if (pte_protnone(pte) && !gup_can_follow_protnone(flags))
/*
* Always fallback to ordinary GUP on PROT_NONE-mapped pages:
* pte_access_permitted() better should reject these pages
* either way: otherwise, GUP-fast might succeed in
* cases where ordinary GUP would fail due to VMA access
* permissions.
*/
if (pte_protnone(pte))
goto pte_unmap;
if (!pte_access_permitted(pte, flags & FOLL_WRITE))
@ -2970,8 +2988,8 @@ static int gup_pmd_range(pud_t *pudp, pud_t pud, unsigned long addr, unsigned lo
if (unlikely(pmd_trans_huge(pmd) || pmd_huge(pmd) ||
pmd_devmap(pmd))) {
if (pmd_protnone(pmd) &&
!gup_can_follow_protnone(flags))
/* See gup_pte_range() */
if (pmd_protnone(pmd))
return 0;
if (!gup_huge_pmd(pmd, pmdp, addr, next, flags,
@ -3151,7 +3169,7 @@ static int internal_get_user_pages_fast(unsigned long start,
if (WARN_ON_ONCE(gup_flags & ~(FOLL_WRITE | FOLL_LONGTERM |
FOLL_FORCE | FOLL_PIN | FOLL_GET |
FOLL_FAST_ONLY | FOLL_NOFAULT |
FOLL_PCI_P2PDMA)))
FOLL_PCI_P2PDMA | FOLL_HONOR_NUMA_FAULT)))
return -EINVAL;
if (gup_flags & FOLL_PIN)

1
mm/hmm.c
View File

@ -562,6 +562,7 @@ static const struct mm_walk_ops hmm_walk_ops = {
.pte_hole = hmm_vma_walk_hole,
.hugetlb_entry = hmm_vma_walk_hugetlb_entry,
.test_walk = hmm_vma_walk_test,
.walk_lock = PGWALK_RDLOCK,
};
/**

5
mm/huge_memory.c
View File

@ -1467,8 +1467,7 @@ struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
if ((flags & FOLL_DUMP) && is_huge_zero_pmd(*pmd))
return ERR_PTR(-EFAULT);
/* Full NUMA hinting faults to serialise migration in fault paths */
if (pmd_protnone(*pmd) && !gup_can_follow_protnone(flags))
if (pmd_protnone(*pmd) && !gup_can_follow_protnone(vma, flags))
return NULL;
if (!pmd_write(*pmd) && gup_must_unshare(vma, flags, page))
@ -1613,7 +1612,7 @@ bool madvise_free_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
* If other processes are mapping this folio, we couldn't discard
* the folio unless they all do MADV_FREE so let's skip the folio.
*/
if (folio_mapcount(folio) != 1)
if (folio_estimated_sharers(folio) != 1)
goto out;
if (!folio_trylock(folio))

17
mm/internal.h
View File

@ -924,6 +924,13 @@ int migrate_device_coherent_page(struct page *page);
struct folio *try_grab_folio(struct page *page, int refs, unsigned int flags);
int __must_check try_grab_page(struct page *page, unsigned int flags);
/*
* mm/huge_memory.c
*/
struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
unsigned long addr, pmd_t *pmd,
unsigned int flags);
enum {
/* mark page accessed */
FOLL_TOUCH = 1 << 16,
@ -997,6 +1004,16 @@ static inline bool gup_must_unshare(struct vm_area_struct *vma,
if (IS_ENABLED(CONFIG_HAVE_FAST_GUP))
smp_rmb();
/*
* During GUP-fast we might not get called on the head page for a
* hugetlb page that is mapped using cont-PTE, because GUP-fast does
* not work with the abstracted hugetlb PTEs that always point at the
* head page. For hugetlb, PageAnonExclusive only applies on the head
* page (as it cannot be partially COW-shared), so lookup the head page.
*/
if (unlikely(!PageHead(page) && PageHuge(page)))
page = compound_head(page);
/*
* Note that PageKsm() pages cannot be exclusive, and consequently,
* cannot get pinned.

25
mm/ksm.c
View File

@ -455,6 +455,12 @@ static int break_ksm_pmd_entry(pmd_t *pmd, unsigned long addr, unsigned long nex
static const struct mm_walk_ops break_ksm_ops = {
.pmd_entry = break_ksm_pmd_entry,
.walk_lock = PGWALK_RDLOCK,
};
static const struct mm_walk_ops break_ksm_lock_vma_ops = {
.pmd_entry = break_ksm_pmd_entry,
.walk_lock = PGWALK_WRLOCK,
};
/*
@ -470,16 +476,17 @@ static const struct mm_walk_ops break_ksm_ops = {
* of the process that owns 'vma'. We also do not want to enforce
* protection keys here anyway.
*/
static int break_ksm(struct vm_area_struct *vma, unsigned long addr)
static int break_ksm(struct vm_area_struct *vma, unsigned long addr, bool lock_vma)
{
vm_fault_t ret = 0;
const struct mm_walk_ops *ops = lock_vma ?
&break_ksm_lock_vma_ops : &break_ksm_ops;
do {
int ksm_page;
cond_resched();
ksm_page = walk_page_range_vma(vma, addr, addr + 1,
&break_ksm_ops, NULL);
ksm_page = walk_page_range_vma(vma, addr, addr + 1, ops, NULL);
if (WARN_ON_ONCE(ksm_page < 0))
return ksm_page;
if (!ksm_page)
@ -565,7 +572,7 @@ static void break_cow(struct ksm_rmap_item *rmap_item)
mmap_read_lock(mm);
vma = find_mergeable_vma(mm, addr);
if (vma)
break_ksm(vma, addr);
break_ksm(vma, addr, false);
mmap_read_unlock(mm);
}
@ -871,7 +878,7 @@ static void remove_trailing_rmap_items(struct ksm_rmap_item **rmap_list)
* in cmp_and_merge_page on one of the rmap_items we would be removing.
*/
static int unmerge_ksm_pages(struct vm_area_struct *vma,
unsigned long start, unsigned long end)
unsigned long start, unsigned long end, bool lock_vma)
{
unsigned long addr;
int err = 0;
@ -882,7 +889,7 @@ static int unmerge_ksm_pages(struct vm_area_struct *vma,
if (signal_pending(current))
err = -ERESTARTSYS;
else
err = break_ksm(vma, addr);
err = break_ksm(vma, addr, lock_vma);
}
return err;
}
@ -1029,7 +1036,7 @@ static int unmerge_and_remove_all_rmap_items(void)
if (!(vma->vm_flags & VM_MERGEABLE) || !vma->anon_vma)
continue;
err = unmerge_ksm_pages(vma,
vma->vm_start, vma->vm_end);
vma->vm_start, vma->vm_end, false);
if (err)
goto error;
}
@ -2530,7 +2537,7 @@ static int __ksm_del_vma(struct vm_area_struct *vma)
return 0;
if (vma->anon_vma) {
err = unmerge_ksm_pages(vma, vma->vm_start, vma->vm_end);
err = unmerge_ksm_pages(vma, vma->vm_start, vma->vm_end, true);
if (err)
return err;
}
@ -2668,7 +2675,7 @@ int ksm_madvise(struct vm_area_struct *vma, unsigned long start,
return 0; /* just ignore the advice */
if (vma->anon_vma) {
err = unmerge_ksm_pages(vma, start, end);
err = unmerge_ksm_pages(vma, start, end, true);
if (err)
return err;
}

9
mm/madvise.c
View File

@ -233,6 +233,7 @@ static int swapin_walk_pmd_entry(pmd_t *pmd, unsigned long start,
static const struct mm_walk_ops swapin_walk_ops = {
.pmd_entry = swapin_walk_pmd_entry,
.walk_lock = PGWALK_RDLOCK,
};
static void shmem_swapin_range(struct vm_area_struct *vma,
@ -383,7 +384,7 @@ static int madvise_cold_or_pageout_pte_range(pmd_t *pmd,
folio = pfn_folio(pmd_pfn(orig_pmd));
/* Do not interfere with other mappings of this folio */
if (folio_mapcount(folio) != 1)
if (folio_estimated_sharers(folio) != 1)
goto huge_unlock;
if (pageout_anon_only_filter && !folio_test_anon(folio))
@ -457,7 +458,7 @@ regular_folio:
if (folio_test_large(folio)) {
int err;
if (folio_mapcount(folio) != 1)
if (folio_estimated_sharers(folio) != 1)
break;
if (pageout_anon_only_filter && !folio_test_anon(folio))
break;
@ -534,6 +535,7 @@ regular_folio:
static const struct mm_walk_ops cold_walk_ops = {
.pmd_entry = madvise_cold_or_pageout_pte_range,
.walk_lock = PGWALK_RDLOCK,
};
static void madvise_cold_page_range(struct mmu_gather *tlb,
@ -678,7 +680,7 @@ static int madvise_free_pte_range(pmd_t *pmd, unsigned long addr,
if (folio_test_large(folio)) {
int err;
if (folio_mapcount(folio) != 1)
if (folio_estimated_sharers(folio) != 1)
break;
if (!folio_trylock(folio))
break;
@ -757,6 +759,7 @@ static int madvise_free_pte_range(pmd_t *pmd, unsigned long addr,
static const struct mm_walk_ops madvise_free_walk_ops = {
.pmd_entry = madvise_free_pte_range,
.walk_lock = PGWALK_RDLOCK,
};
static int madvise_free_single_vma(struct vm_area_struct *vma,

2
mm/memcontrol.c
View File

@ -6024,6 +6024,7 @@ static int mem_cgroup_count_precharge_pte_range(pmd_t *pmd,
static const struct mm_walk_ops precharge_walk_ops = {
.pmd_entry = mem_cgroup_count_precharge_pte_range,
.walk_lock = PGWALK_RDLOCK,
};
static unsigned long mem_cgroup_count_precharge(struct mm_struct *mm)
@ -6303,6 +6304,7 @@ put: /* get_mctgt_type() gets & locks the page */
static const struct mm_walk_ops charge_walk_ops = {
.pmd_entry = mem_cgroup_move_charge_pte_range,
.walk_lock = PGWALK_RDLOCK,
};
static void mem_cgroup_move_charge(void)

12
mm/memory-failure.c
View File

@ -831,6 +831,7 @@ static int hwpoison_hugetlb_range(pte_t *ptep, unsigned long hmask,
static const struct mm_walk_ops hwp_walk_ops = {
.pmd_entry = hwpoison_pte_range,
.hugetlb_entry = hwpoison_hugetlb_range,
.walk_lock = PGWALK_RDLOCK,
};
/*
@ -2740,10 +2741,13 @@ retry:
if (ret > 0) {
ret = soft_offline_in_use_page(page);
} else if (ret == 0) {
if (!page_handle_poison(page, true, false) && try_again) {
try_again = false;
flags &= ~MF_COUNT_INCREASED;
goto retry;
if (!page_handle_poison(page, true, false)) {
if (try_again) {
try_again = false;
flags &= ~MF_COUNT_INCREASED;
goto retry;
}
ret = -EBUSY;
}
}

22
mm/mempolicy.c
View File

@ -718,6 +718,14 @@ static const struct mm_walk_ops queue_pages_walk_ops = {
.hugetlb_entry = queue_folios_hugetlb,
.pmd_entry = queue_folios_pte_range,
.test_walk = queue_pages_test_walk,
.walk_lock = PGWALK_RDLOCK,
};
static const struct mm_walk_ops queue_pages_lock_vma_walk_ops = {
.hugetlb_entry = queue_folios_hugetlb,
.pmd_entry = queue_folios_pte_range,
.test_walk = queue_pages_test_walk,
.walk_lock = PGWALK_WRLOCK,
};
/*
@ -738,7 +746,7 @@ static const struct mm_walk_ops queue_pages_walk_ops = {
static int
queue_pages_range(struct mm_struct *mm, unsigned long start, unsigned long end,
nodemask_t *nodes, unsigned long flags,
struct list_head *pagelist)
struct list_head *pagelist, bool lock_vma)
{
int err;
struct queue_pages qp = {
@ -749,8 +757,10 @@ queue_pages_range(struct mm_struct *mm, unsigned long start, unsigned long end,
.end = end,
.first = NULL,
};
const struct mm_walk_ops *ops = lock_vma ?
&queue_pages_lock_vma_walk_ops : &queue_pages_walk_ops;
err = walk_page_range(mm, start, end, &queue_pages_walk_ops, &qp);
err = walk_page_range(mm, start, end, ops, &qp);
if (!qp.first)
/* whole range in hole */
@ -1078,7 +1088,7 @@ static int migrate_to_node(struct mm_struct *mm, int source, int dest,
vma = find_vma(mm, 0);
VM_BUG_ON(!(flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)));
queue_pages_range(mm, vma->vm_start, mm->task_size, &nmask,
flags | MPOL_MF_DISCONTIG_OK, &pagelist);
flags | MPOL_MF_DISCONTIG_OK, &pagelist, false);
if (!list_empty(&pagelist)) {
err = migrate_pages(&pagelist, alloc_migration_target, NULL,
@ -1321,12 +1331,8 @@ static long do_mbind(unsigned long start, unsigned long len,
* Lock the VMAs before scanning for pages to migrate, to ensure we don't
* miss a concurrently inserted page.
*/
vma_iter_init(&vmi, mm, start);
for_each_vma_range(vmi, vma, end)
vma_start_write(vma);
ret = queue_pages_range(mm, start, end, nmask,
flags | MPOL_MF_INVERT, &pagelist);
flags | MPOL_MF_INVERT, &pagelist, true);
if (ret < 0) {
err = ret;

1
mm/migrate_device.c
View File

@ -279,6 +279,7 @@ next:
static const struct mm_walk_ops migrate_vma_walk_ops = {
.pmd_entry = migrate_vma_collect_pmd,
.pte_hole = migrate_vma_collect_hole,
.walk_lock = PGWALK_RDLOCK,
};
/*

1
mm/mincore.c
View File

@ -176,6 +176,7 @@ static const struct mm_walk_ops mincore_walk_ops = {
.pmd_entry = mincore_pte_range,
.pte_hole = mincore_unmapped_range,
.hugetlb_entry = mincore_hugetlb,
.walk_lock = PGWALK_RDLOCK,
};
/*

1
mm/mlock.c
View File

@ -371,6 +371,7 @@ static void mlock_vma_pages_range(struct vm_area_struct *vma,
{
static const struct mm_walk_ops mlock_walk_ops = {
.pmd_entry = mlock_pte_range,
.walk_lock = PGWALK_WRLOCK_VERIFY,
};
/*

1
mm/mprotect.c
View File

@ -568,6 +568,7 @@ static const struct mm_walk_ops prot_none_walk_ops = {
.pte_entry = prot_none_pte_entry,
.hugetlb_entry = prot_none_hugetlb_entry,
.test_walk = prot_none_test,
.walk_lock = PGWALK_WRLOCK,
};
int

36
mm/pagewalk.c
View File

@ -400,6 +400,33 @@ static int __walk_page_range(unsigned long start, unsigned long end,
return err;
}
static inline void process_mm_walk_lock(struct mm_struct *mm,
enum page_walk_lock walk_lock)
{
if (walk_lock == PGWALK_RDLOCK)
mmap_assert_locked(mm);
else
mmap_assert_write_locked(mm);
}
static inline void process_vma_walk_lock(struct vm_area_struct *vma,
enum page_walk_lock walk_lock)
{
#ifdef CONFIG_PER_VMA_LOCK
switch (walk_lock) {
case PGWALK_WRLOCK:
vma_start_write(vma);
break;
case PGWALK_WRLOCK_VERIFY:
vma_assert_write_locked(vma);
break;
case PGWALK_RDLOCK:
/* PGWALK_RDLOCK is handled by process_mm_walk_lock */
break;
}
#endif
}
/**
* walk_page_range - walk page table with caller specific callbacks
* @mm: mm_struct representing the target process of page table walk
@ -459,7 +486,7 @@ int walk_page_range(struct mm_struct *mm, unsigned long start,
if (!walk.mm)
return -EINVAL;
mmap_assert_locked(walk.mm);
process_mm_walk_lock(walk.mm, ops->walk_lock);
vma = find_vma(walk.mm, start);
do {
@ -474,6 +501,7 @@ int walk_page_range(struct mm_struct *mm, unsigned long start,
if (ops->pte_hole)
err = ops->pte_hole(start, next, -1, &walk);
} else { /* inside vma */
process_vma_walk_lock(vma, ops->walk_lock);
walk.vma = vma;
next = min(end, vma->vm_end);
vma = find_vma(mm, vma->vm_end);
@ -549,7 +577,8 @@ int walk_page_range_vma(struct vm_area_struct *vma, unsigned long start,
if (start < vma->vm_start || end > vma->vm_end)
return -EINVAL;
mmap_assert_locked(walk.mm);
process_mm_walk_lock(walk.mm, ops->walk_lock);
process_vma_walk_lock(vma, ops->walk_lock);
return __walk_page_range(start, end, &walk);
}
@ -566,7 +595,8 @@ int walk_page_vma(struct vm_area_struct *vma, const struct mm_walk_ops *ops,
if (!walk.mm)
return -EINVAL;
mmap_assert_locked(walk.mm);
process_mm_walk_lock(walk.mm, ops->walk_lock);
process_vma_walk_lock(vma, ops->walk_lock);
return __walk_page_range(vma->vm_start, vma->vm_end, &walk);
}

6
mm/shmem.c
View File

@ -806,14 +806,16 @@ unsigned long shmem_partial_swap_usage(struct address_space *mapping,
XA_STATE(xas, &mapping->i_pages, start);
struct page *page;
unsigned long swapped = 0;
unsigned long max = end - 1;
rcu_read_lock();
xas_for_each(&xas, page, end - 1) {
xas_for_each(&xas, page, max) {
if (xas_retry(&xas, page))
continue;
if (xa_is_value(page))
swapped++;
if (xas.xa_index == max)
break;
if (need_resched()) {
xas_pause(&xas);
cond_resched_rcu();

4
mm/vmalloc.c
View File

@ -2979,6 +2979,10 @@ void *vmap_pfn(unsigned long *pfns, unsigned int count, pgprot_t prot)
free_vm_area(area);
return NULL;
}
flush_cache_vmap((unsigned long)area->addr,
(unsigned long)area->addr + count * PAGE_SIZE);
return area->addr;
}
EXPORT_SYMBOL_GPL(vmap_pfn);

14
mm/vmscan.c
View File

@ -4284,6 +4284,7 @@ static void walk_mm(struct lruvec *lruvec, struct mm_struct *mm, struct lru_gen_
static const struct mm_walk_ops mm_walk_ops = {
.test_walk = should_skip_vma,
.p4d_entry = walk_pud_range,
.walk_lock = PGWALK_RDLOCK,
};
int err;
@ -4853,16 +4854,17 @@ void lru_gen_release_memcg(struct mem_cgroup *memcg)
spin_lock_irq(&pgdat->memcg_lru.lock);
VM_WARN_ON_ONCE(hlist_nulls_unhashed(&lruvec->lrugen.list));
if (hlist_nulls_unhashed(&lruvec->lrugen.list))
goto unlock;
gen = lruvec->lrugen.gen;
hlist_nulls_del_rcu(&lruvec->lrugen.list);
hlist_nulls_del_init_rcu(&lruvec->lrugen.list);
pgdat->memcg_lru.nr_memcgs[gen]--;
if (!pgdat->memcg_lru.nr_memcgs[gen] && gen == get_memcg_gen(pgdat->memcg_lru.seq))
WRITE_ONCE(pgdat->memcg_lru.seq, pgdat->memcg_lru.seq + 1);
unlock:
spin_unlock_irq(&pgdat->memcg_lru.lock);
}
}
@ -5434,8 +5436,10 @@ restart:
rcu_read_lock();
hlist_nulls_for_each_entry_rcu(lrugen, pos, &pgdat->memcg_lru.fifo[gen][bin], list) {
if (op)
if (op) {
lru_gen_rotate_memcg(lruvec, op);
op = 0;
}
mem_cgroup_put(memcg);
@ -5443,7 +5447,7 @@ restart:
memcg = lruvec_memcg(lruvec);
if (!mem_cgroup_tryget(memcg)) {
op = 0;
lru_gen_release_memcg(memcg);
memcg = NULL;
continue;
}

80
tools/testing/selftests/cachestat/test_cachestat.c
View File

@ -4,10 +4,12 @@
#include <stdio.h>
#include <stdbool.h>
#include <linux/kernel.h>
#include <linux/magic.h>
#include <linux/mman.h>
#include <sys/mman.h>
#include <sys/shm.h>
#include <sys/syscall.h>
#include <sys/vfs.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
@ -15,6 +17,8 @@
#include "../kselftest.h"
#define NR_TESTS 9
static const char * const dev_files[] = {
"/dev/zero", "/dev/null", "/dev/urandom",
"/proc/version", "/proc"
@ -90,6 +94,20 @@ out:
return ret;
}
/*
* fsync() is implemented via noop_fsync() on tmpfs. This makes the fsync()
* test fail below, so we need to check for test file living on a tmpfs.
*/
static bool is_on_tmpfs(int fd)
{
struct statfs statfs_buf;
if (fstatfs(fd, &statfs_buf))
return false;
return statfs_buf.f_type == TMPFS_MAGIC;
}
/*
* Open/create the file at filename, (optionally) write random data to it
* (exactly num_pages), then test the cachestat syscall on this file.
@ -97,13 +115,13 @@ out:
* If test_fsync == true, fsync the file, then check the number of dirty
* pages.
*/
bool test_cachestat(const char *filename, bool write_random, bool create,
bool test_fsync, unsigned long num_pages, int open_flags,
mode_t open_mode)
static int test_cachestat(const char *filename, bool write_random, bool create,
bool test_fsync, unsigned long num_pages,
int open_flags, mode_t open_mode)
{
size_t PS = sysconf(_SC_PAGESIZE);
int filesize = num_pages * PS;
bool ret = true;
int ret = KSFT_PASS;
long syscall_ret;
struct cachestat cs;
struct cachestat_range cs_range = { 0, filesize };
@ -112,7 +130,7 @@ bool test_cachestat(const char *filename, bool write_random, bool create,
if (fd == -1) {
ksft_print_msg("Unable to create/open file.\n");
ret = false;
ret = KSFT_FAIL;
goto out;
} else {
ksft_print_msg("Create/open %s\n", filename);
@ -121,7 +139,7 @@ bool test_cachestat(const char *filename, bool write_random, bool create,
if (write_random) {
if (!write_exactly(fd, filesize)) {
ksft_print_msg("Unable to access urandom.\n");
ret = false;
ret = KSFT_FAIL;
goto out1;
}
}
@ -132,7 +150,7 @@ bool test_cachestat(const char *filename, bool write_random, bool create,
if (syscall_ret) {
ksft_print_msg("Cachestat returned non-zero.\n");
ret = false;
ret = KSFT_FAIL;
goto out1;
} else {
@ -142,15 +160,17 @@ bool test_cachestat(const char *filename, bool write_random, bool create,
if (cs.nr_cache + cs.nr_evicted != num_pages) {
ksft_print_msg(
"Total number of cached and evicted pages is off.\n");
ret = false;
ret = KSFT_FAIL;
}
}
}
if (test_fsync) {
if (fsync(fd)) {
if (is_on_tmpfs(fd)) {
ret = KSFT_SKIP;
} else if (fsync(fd)) {
ksft_print_msg("fsync fails.\n");
ret = false;
ret = KSFT_FAIL;
} else {
syscall_ret = syscall(cachestat_nr, fd, &cs_range, &cs, 0);
@ -161,13 +181,13 @@ bool test_cachestat(const char *filename, bool write_random, bool create,
print_cachestat(&cs);
if (cs.nr_dirty) {
ret = false;
ret = KSFT_FAIL;
ksft_print_msg(
"Number of dirty should be zero after fsync.\n");
}
} else {
ksft_print_msg("Cachestat (after fsync) returned non-zero.\n");
ret = false;
ret = KSFT_FAIL;
goto out1;
}
}
@ -236,13 +256,29 @@ out:
int main(void)
{
int ret = 0;
int ret;
ksft_print_header();
ret = syscall(__NR_cachestat, -1, NULL, NULL, 0);
if (ret == -1 && errno == ENOSYS)
ksft_exit_skip("cachestat syscall not available\n");
ksft_set_plan(NR_TESTS);
if (ret == -1 && errno == EBADF) {
ksft_test_result_pass("bad file descriptor recognized\n");
ret = 0;
} else {
ksft_test_result_fail("bad file descriptor ignored\n");
ret = 1;
}
for (int i = 0; i < 5; i++) {
const char *dev_filename = dev_files[i];
if (test_cachestat(dev_filename, false, false, false,
4, O_RDONLY, 0400))
4, O_RDONLY, 0400) == KSFT_PASS)
ksft_test_result_pass("cachestat works with %s\n", dev_filename);
else {
ksft_test_result_fail("cachestat fails with %s\n", dev_filename);
@ -251,13 +287,27 @@ int main(void)
}
if (test_cachestat("tmpfilecachestat", true, true,
true, 4, O_CREAT | O_RDWR, 0400 | 0600))
false, 4, O_CREAT | O_RDWR, 0600) == KSFT_PASS)
ksft_test_result_pass("cachestat works with a normal file\n");
else {
ksft_test_result_fail("cachestat fails with normal file\n");
ret = 1;
}
switch (test_cachestat("tmpfilecachestat", true, true,
true, 4, O_CREAT | O_RDWR, 0600)) {
case KSFT_FAIL:
ksft_test_result_fail("cachestat fsync fails with normal file\n");
ret = KSFT_FAIL;
break;
case KSFT_PASS:
ksft_test_result_pass("cachestat fsync works with a normal file\n");
break;
case KSFT_SKIP:
ksft_test_result_skip("tmpfilecachestat is on tmpfs\n");
break;
}
if (test_cachestat_shmem())
ksft_test_result_pass("cachestat works with a shmem file\n");
else {

4
tools/testing/selftests/cgroup/test_kmem.c
View File

@ -75,11 +75,11 @@ static int test_kmem_basic(const char *root)
sleep(1);
slab1 = cg_read_key_long(cg, "memory.stat", "slab ");
if (slab1 <= 0)
if (slab1 < 0)
goto cleanup;
current = cg_read_long(cg, "memory.current");
if (current <= 0)
if (current < 0)
goto cleanup;
if (slab1 < slab0 / 2 && current < slab0 / 2)

9
tools/testing/selftests/mm/hmm-tests.c
View File

@ -57,9 +57,14 @@ enum {
#define ALIGN(x, a) (((x) + (a - 1)) & (~((a) - 1)))
/* Just the flags we need, copied from mm.h: */
#define FOLL_WRITE 0x01 /* check pte is writable */
#define FOLL_LONGTERM 0x10000 /* mapping lifetime is indefinite */
#ifndef FOLL_WRITE
#define FOLL_WRITE 0x01 /* check pte is writable */
#endif
#ifndef FOLL_LONGTERM
#define FOLL_LONGTERM 0x100 /* mapping lifetime is indefinite */
#endif
FIXTURE(hmm)
{
int fd;