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mm: provide mm_struct and address to huge_ptep_get()

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On powerpc 8xx huge_ptep_get() will need to know whether the given ptep is
a PTE entry or a PMD entry.  This cannot be known with the PMD entry
itself because there is no easy way to know it from the content of the
entry.

So huge_ptep_get() will need to know either the size of the page or get
the pmd.

In order to be consistent with huge_ptep_get_and_clear(), give mm and
address to huge_ptep_get().

Link: https://lkml.kernel.org/r/cc00c70dd384298796a4e1b25d6c4eb306d3af85.1719928057.git.christophe.leroy@csgroup.eu
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Peter Xu <peterx@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Christophe Leroy 2024-07-02 15:51:20 +02:00 committed by Andrew Morton
parent 18d095b255
commit e6c0c03245
21 changed files with 53 additions and 53 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/arm/include/asm/hugetlb-3level.h
View File

@ -13,12 +13,12 @@
/*
* If our huge pte is non-zero then mark the valid bit.
* This allows pte_present(huge_ptep_get(ptep)) to return true for non-zero
* This allows pte_present(huge_ptep_get(mm,addr,ptep)) to return true for non-zero
* ptes.
* (The valid bit is automatically cleared by set_pte_at for PROT_NONE ptes).
*/
#define __HAVE_ARCH_HUGE_PTEP_GET
static inline pte_t huge_ptep_get(pte_t *ptep)
static inline pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
pte_t retval = *ptep;
if (pte_val(retval))

2
arch/arm64/include/asm/hugetlb.h
View File

@ -46,7 +46,7 @@ extern pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
extern void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, unsigned long sz);
#define __HAVE_ARCH_HUGE_PTEP_GET
extern pte_t huge_ptep_get(pte_t *ptep);
extern pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
void __init arm64_hugetlb_cma_reserve(void);

2
arch/arm64/mm/hugetlbpage.c
View File

@ -127,7 +127,7 @@ static inline int num_contig_ptes(unsigned long size, size_t *pgsize)
return contig_ptes;
}
pte_t huge_ptep_get(pte_t *ptep)
pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
int ncontig, i;
size_t pgsize;

2
arch/riscv/include/asm/hugetlb.h
View File

@ -44,7 +44,7 @@ int huge_ptep_set_access_flags(struct vm_area_struct *vma,
pte_t pte, int dirty);
#define __HAVE_ARCH_HUGE_PTEP_GET
pte_t huge_ptep_get(pte_t *ptep);
pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags);
#define arch_make_huge_pte arch_make_huge_pte

2
arch/riscv/mm/hugetlbpage.c
View File

@ -3,7 +3,7 @@
#include <linux/err.h>
#ifdef CONFIG_RISCV_ISA_SVNAPOT
pte_t huge_ptep_get(pte_t *ptep)
pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
unsigned long pte_num;
int i;

4
arch/s390/include/asm/hugetlb.h
View File

@ -19,7 +19,7 @@ void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pte, unsigned long sz);
void __set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pte);
pte_t huge_ptep_get(pte_t *ptep);
pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
unsigned long addr, pte_t *ptep);
@ -64,7 +64,7 @@ static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep,
pte_t pte, int dirty)
{
int changed = !pte_same(huge_ptep_get(ptep), pte);
int changed = !pte_same(huge_ptep_get(vma->vm_mm, addr, ptep), pte);
if (changed) {
huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
__set_huge_pte_at(vma->vm_mm, addr, ptep, pte);

4
arch/s390/mm/hugetlbpage.c
View File

@ -169,7 +169,7 @@ void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
__set_huge_pte_at(mm, addr, ptep, pte);
}
pte_t huge_ptep_get(pte_t *ptep)
pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
return __rste_to_pte(pte_val(*ptep));
}
@ -177,7 +177,7 @@ pte_t huge_ptep_get(pte_t *ptep)
pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
unsigned long addr, pte_t *ptep)
{
pte_t pte = huge_ptep_get(ptep);
pte_t pte = huge_ptep_get(mm, addr, ptep);
pmd_t *pmdp = (pmd_t *) ptep;
pud_t *pudp = (pud_t *) ptep;

2
fs/hugetlbfs/inode.c
View File

@ -422,7 +422,7 @@ static bool hugetlb_vma_maps_page(struct vm_area_struct *vma,
if (!ptep)
return false;
pte = huge_ptep_get(ptep);
pte = huge_ptep_get(vma->vm_mm, addr, ptep);
if (huge_pte_none(pte) || !pte_present(pte))
return false;

10
fs/proc/task_mmu.c
View File

@ -1013,7 +1013,7 @@ static int smaps_hugetlb_range(pte_t *pte, unsigned long hmask,
{
struct mem_size_stats *mss = walk->private;
struct vm_area_struct *vma = walk->vma;
pte_t ptent = huge_ptep_get(pte);
pte_t ptent = huge_ptep_get(walk->mm, addr, pte);
struct folio *folio = NULL;
bool present = false;
@ -1878,7 +1878,7 @@ static int pagemap_hugetlb_range(pte_t *ptep, unsigned long hmask,
if (vma->vm_flags & VM_SOFTDIRTY)
flags |= PM_SOFT_DIRTY;
pte = huge_ptep_get(ptep);
pte = huge_ptep_get(walk->mm, addr, ptep);
if (pte_present(pte)) {
struct folio *folio = page_folio(pte_page(pte));
@ -2567,7 +2567,7 @@ static int pagemap_scan_hugetlb_entry(pte_t *ptep, unsigned long hmask,
if (~p->arg.flags & PM_SCAN_WP_MATCHING) {
/* Go the short route when not write-protecting pages. */
pte = huge_ptep_get(ptep);
pte = huge_ptep_get(walk->mm, start, ptep);
categories = p->cur_vma_category | pagemap_hugetlb_category(pte);
if (!pagemap_scan_is_interesting_page(categories, p))
@ -2579,7 +2579,7 @@ static int pagemap_scan_hugetlb_entry(pte_t *ptep, unsigned long hmask,
i_mmap_lock_write(vma->vm_file->f_mapping);
ptl = huge_pte_lock(hstate_vma(vma), vma->vm_mm, ptep);
pte = huge_ptep_get(ptep);
pte = huge_ptep_get(walk->mm, start, ptep);
categories = p->cur_vma_category | pagemap_hugetlb_category(pte);
if (!pagemap_scan_is_interesting_page(categories, p))
@ -2975,7 +2975,7 @@ static int gather_pte_stats(pmd_t *pmd, unsigned long addr,
static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask,
unsigned long addr, unsigned long end, struct mm_walk *walk)
{
pte_t huge_pte = huge_ptep_get(pte);
pte_t huge_pte = huge_ptep_get(walk->mm, addr, pte);
struct numa_maps *md;
struct page *page;

2
fs/userfaultfd.c
View File

@ -257,7 +257,7 @@ static inline bool userfaultfd_huge_must_wait(struct userfaultfd_ctx *ctx,
goto out;
ret = false;
pte = huge_ptep_get(ptep);
pte = huge_ptep_get(vma->vm_mm, vmf->address, ptep);
/*
* Lockless access: we're in a wait_event so it's ok if it

2
include/asm-generic/hugetlb.h
View File

@ -144,7 +144,7 @@ static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
#endif
#ifndef __HAVE_ARCH_HUGE_PTEP_GET
static inline pte_t huge_ptep_get(pte_t *ptep)
static inline pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
return ptep_get(ptep);
}

4
include/linux/swapops.h
View File

@ -334,7 +334,7 @@ static inline bool is_migration_entry_dirty(swp_entry_t entry)
extern void migration_entry_wait(struct mm_struct *mm, pmd_t *pmd,
unsigned long address);
extern void migration_entry_wait_huge(struct vm_area_struct *vma, pte_t *pte);
extern void migration_entry_wait_huge(struct vm_area_struct *vma, unsigned long addr, pte_t *pte);
#else /* CONFIG_MIGRATION */
static inline swp_entry_t make_readable_migration_entry(pgoff_t offset)
{
@ -359,7 +359,7 @@ static inline int is_migration_entry(swp_entry_t swp)
static inline void migration_entry_wait(struct mm_struct *mm, pmd_t *pmd,
unsigned long address) { }
static inline void migration_entry_wait_huge(struct vm_area_struct *vma,
pte_t *pte) { }
unsigned long addr, pte_t *pte) { }
static inline int is_writable_migration_entry(swp_entry_t entry)
{
return 0;

6
mm/damon/vaddr.c
View File

@ -339,7 +339,7 @@ static void damon_hugetlb_mkold(pte_t *pte, struct mm_struct *mm,
struct vm_area_struct *vma, unsigned long addr)
{
bool referenced = false;
pte_t entry = huge_ptep_get(pte);
pte_t entry = huge_ptep_get(mm, addr, pte);
struct folio *folio = pfn_folio(pte_pfn(entry));
unsigned long psize = huge_page_size(hstate_vma(vma));
@ -373,7 +373,7 @@ static int damon_mkold_hugetlb_entry(pte_t *pte, unsigned long hmask,
pte_t entry;
ptl = huge_pte_lock(h, walk->mm, pte);
entry = huge_ptep_get(pte);
entry = huge_ptep_get(walk->mm, addr, pte);
if (!pte_present(entry))
goto out;
@ -509,7 +509,7 @@ static int damon_young_hugetlb_entry(pte_t *pte, unsigned long hmask,
pte_t entry;
ptl = huge_pte_lock(h, walk->mm, pte);
entry = huge_ptep_get(pte);
entry = huge_ptep_get(walk->mm, addr, pte);
if (!pte_present(entry))
goto out;

2
mm/gup.c
View File

@ -604,7 +604,7 @@ static int gup_hugepte(struct vm_area_struct *vma, pte_t *ptep, unsigned long sz
if (pte_end < end)
end = pte_end;
pte = huge_ptep_get(ptep);
pte = huge_ptep_get(vma->vm_mm, addr, ptep);
if (!pte_access_permitted(pte, flags & FOLL_WRITE))
return 0;

2
mm/hmm.c
View File

@ -480,7 +480,7 @@ static int hmm_vma_walk_hugetlb_entry(pte_t *pte, unsigned long hmask,
pte_t entry;
ptl = huge_pte_lock(hstate_vma(vma), walk->mm, pte);
entry = huge_ptep_get(pte);
entry = huge_ptep_get(walk->mm, addr, pte);
i = (start - range->start) >> PAGE_SHIFT;
pfn_req_flags = range->hmm_pfns[i];

44
mm/hugetlb.c
View File

@ -5287,7 +5287,7 @@ static void set_huge_ptep_writable(struct vm_area_struct *vma,
{
pte_t entry;
entry = huge_pte_mkwrite(huge_pte_mkdirty(huge_ptep_get(ptep)));
entry = huge_pte_mkwrite(huge_pte_mkdirty(huge_ptep_get(vma->vm_mm, address, ptep)));
if (huge_ptep_set_access_flags(vma, address, ptep, entry, 1))
update_mmu_cache(vma, address, ptep);
}
@ -5395,7 +5395,7 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
dst_ptl = huge_pte_lock(h, dst, dst_pte);
src_ptl = huge_pte_lockptr(h, src, src_pte);
spin_lock_nested(src_ptl, SINGLE_DEPTH_NESTING);
entry = huge_ptep_get(src_pte);
entry = huge_ptep_get(src_vma->vm_mm, addr, src_pte);
again:
if (huge_pte_none(entry)) {
/*
@ -5433,7 +5433,7 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
set_huge_pte_at(dst, addr, dst_pte,
make_pte_marker(marker), sz);
} else {
entry = huge_ptep_get(src_pte);
entry = huge_ptep_get(src_vma->vm_mm, addr, src_pte);
pte_folio = page_folio(pte_page(entry));
folio_get(pte_folio);
@ -5474,7 +5474,7 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
dst_ptl = huge_pte_lock(h, dst, dst_pte);
src_ptl = huge_pte_lockptr(h, src, src_pte);
spin_lock_nested(src_ptl, SINGLE_DEPTH_NESTING);
entry = huge_ptep_get(src_pte);
entry = huge_ptep_get(src_vma->vm_mm, addr, src_pte);
if (!pte_same(src_pte_old, entry)) {
restore_reserve_on_error(h, dst_vma, addr,
new_folio);
@ -5584,7 +5584,7 @@ int move_hugetlb_page_tables(struct vm_area_struct *vma,
new_addr |= last_addr_mask;
continue;
}
if (huge_pte_none(huge_ptep_get(src_pte)))
if (huge_pte_none(huge_ptep_get(mm, old_addr, src_pte)))
continue;
if (huge_pmd_unshare(mm, vma, old_addr, src_pte)) {
@ -5657,7 +5657,7 @@ void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
continue;
}
pte = huge_ptep_get(ptep);
pte = huge_ptep_get(mm, address, ptep);
if (huge_pte_none(pte)) {
spin_unlock(ptl);
continue;
@ -5906,7 +5906,7 @@ static vm_fault_t hugetlb_wp(struct folio *pagecache_folio,
struct vm_area_struct *vma = vmf->vma;
struct mm_struct *mm = vma->vm_mm;
const bool unshare = vmf->flags & FAULT_FLAG_UNSHARE;
pte_t pte = huge_ptep_get(vmf->pte);
pte_t pte = huge_ptep_get(mm, vmf->address, vmf->pte);
struct hstate *h = hstate_vma(vma);
struct folio *old_folio;
struct folio *new_folio;
@ -6027,7 +6027,7 @@ static vm_fault_t hugetlb_wp(struct folio *pagecache_folio,
vmf->pte = hugetlb_walk(vma, vmf->address,
huge_page_size(h));
if (likely(vmf->pte &&
pte_same(huge_ptep_get(vmf->pte), pte)))
pte_same(huge_ptep_get(mm, vmf->address, vmf->pte), pte)))
goto retry_avoidcopy;
/*
* race occurs while re-acquiring page table
@ -6065,7 +6065,7 @@ static vm_fault_t hugetlb_wp(struct folio *pagecache_folio,
*/
spin_lock(vmf->ptl);
vmf->pte = hugetlb_walk(vma, vmf->address, huge_page_size(h));
if (likely(vmf->pte && pte_same(huge_ptep_get(vmf->pte), pte))) {
if (likely(vmf->pte && pte_same(huge_ptep_get(mm, vmf->address, vmf->pte), pte))) {
pte_t newpte = make_huge_pte(vma, &new_folio->page, !unshare);
/* Break COW or unshare */
@ -6166,14 +6166,14 @@ static inline vm_fault_t hugetlb_handle_userfault(struct vm_fault *vmf,
* Recheck pte with pgtable lock. Returns true if pte didn't change, or
* false if pte changed or is changing.
*/
static bool hugetlb_pte_stable(struct hstate *h, struct mm_struct *mm,
static bool hugetlb_pte_stable(struct hstate *h, struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t old_pte)
{
spinlock_t *ptl;
bool same;
ptl = huge_pte_lock(h, mm, ptep);
same = pte_same(huge_ptep_get(ptep), old_pte);
same = pte_same(huge_ptep_get(mm, addr, ptep), old_pte);
spin_unlock(ptl);
return same;
@ -6234,7 +6234,7 @@ static vm_fault_t hugetlb_no_page(struct address_space *mapping,
* never happen on the page after UFFDIO_COPY has
* correctly installed the page and returned.
*/
if (!hugetlb_pte_stable(h, mm, vmf->pte, vmf->orig_pte)) {
if (!hugetlb_pte_stable(h, mm, vmf->address, vmf->pte, vmf->orig_pte)) {
ret = 0;
goto out;
}
@ -6263,7 +6263,7 @@ static vm_fault_t hugetlb_no_page(struct address_space *mapping,
* here. Before returning error, get ptl and make
* sure there really is no pte entry.
*/
if (hugetlb_pte_stable(h, mm, vmf->pte, vmf->orig_pte))
if (hugetlb_pte_stable(h, mm, vmf->address, vmf->pte, vmf->orig_pte))
ret = vmf_error(PTR_ERR(folio));
else
ret = 0;
@ -6312,7 +6312,7 @@ static vm_fault_t hugetlb_no_page(struct address_space *mapping,
folio_unlock(folio);
folio_put(folio);
/* See comment in userfaultfd_missing() block above */
if (!hugetlb_pte_stable(h, mm, vmf->pte, vmf->orig_pte)) {
if (!hugetlb_pte_stable(h, mm, vmf->address, vmf->pte, vmf->orig_pte)) {
ret = 0;
goto out;
}
@ -6339,7 +6339,7 @@ static vm_fault_t hugetlb_no_page(struct address_space *mapping,
vmf->ptl = huge_pte_lock(h, mm, vmf->pte);
ret = 0;
/* If pte changed from under us, retry */
if (!pte_same(huge_ptep_get(vmf->pte), vmf->orig_pte))
if (!pte_same(huge_ptep_get(mm, vmf->address, vmf->pte), vmf->orig_pte))
goto backout;
if (anon_rmap)
@ -6460,7 +6460,7 @@ vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
return VM_FAULT_OOM;
}
vmf.orig_pte = huge_ptep_get(vmf.pte);
vmf.orig_pte = huge_ptep_get(mm, vmf.address, vmf.pte);
if (huge_pte_none_mostly(vmf.orig_pte)) {
if (is_pte_marker(vmf.orig_pte)) {
pte_marker marker =
@ -6501,7 +6501,7 @@ vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
* be released there.
*/
mutex_unlock(&hugetlb_fault_mutex_table[hash]);
migration_entry_wait_huge(vma, vmf.pte);
migration_entry_wait_huge(vma, vmf.address, vmf.pte);
return 0;
} else if (unlikely(is_hugetlb_entry_hwpoisoned(vmf.orig_pte)))
ret = VM_FAULT_HWPOISON_LARGE |
@ -6534,11 +6534,11 @@ vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
vmf.ptl = huge_pte_lock(h, mm, vmf.pte);
/* Check for a racing update before calling hugetlb_wp() */
if (unlikely(!pte_same(vmf.orig_pte, huge_ptep_get(vmf.pte))))
if (unlikely(!pte_same(vmf.orig_pte, huge_ptep_get(mm, vmf.address, vmf.pte))))
goto out_ptl;
/* Handle userfault-wp first, before trying to lock more pages */
if (userfaultfd_wp(vma) && huge_pte_uffd_wp(huge_ptep_get(vmf.pte)) &&
if (userfaultfd_wp(vma) && huge_pte_uffd_wp(huge_ptep_get(mm, vmf.address, vmf.pte)) &&
(flags & FAULT_FLAG_WRITE) && !huge_pte_write(vmf.orig_pte)) {
if (!userfaultfd_wp_async(vma)) {
spin_unlock(vmf.ptl);
@ -6666,7 +6666,7 @@ int hugetlb_mfill_atomic_pte(pte_t *dst_pte,
ptl = huge_pte_lock(h, dst_mm, dst_pte);
/* Don't overwrite any existing PTEs (even markers) */
if (!huge_pte_none(huge_ptep_get(dst_pte))) {
if (!huge_pte_none(huge_ptep_get(dst_mm, dst_addr, dst_pte))) {
spin_unlock(ptl);
return -EEXIST;
}
@ -6802,7 +6802,7 @@ int hugetlb_mfill_atomic_pte(pte_t *dst_pte,
* page backing it, then access the page.
*/
ret = -EEXIST;
if (!huge_pte_none_mostly(huge_ptep_get(dst_pte)))
if (!huge_pte_none_mostly(huge_ptep_get(dst_mm, dst_addr, dst_pte)))
goto out_release_unlock;
if (folio_in_pagecache)
@ -6923,7 +6923,7 @@ long hugetlb_change_protection(struct vm_area_struct *vma,
address |= last_addr_mask;
continue;
}
pte = huge_ptep_get(ptep);
pte = huge_ptep_get(mm, address, ptep);
if (unlikely(is_hugetlb_entry_hwpoisoned(pte))) {
/* Nothing to do. */
} else if (unlikely(is_hugetlb_entry_migration(pte))) {

2
mm/memory-failure.c
View File

@ -835,7 +835,7 @@ static int hwpoison_hugetlb_range(pte_t *ptep, unsigned long hmask,
struct mm_walk *walk)
{
struct hwpoison_walk *hwp = walk->private;
pte_t pte = huge_ptep_get(ptep);
pte_t pte = huge_ptep_get(walk->mm, addr, ptep);
struct hstate *h = hstate_vma(walk->vma);
return check_hwpoisoned_entry(pte, addr, huge_page_shift(h),

2
mm/mempolicy.c
View File

@ -624,7 +624,7 @@ static int queue_folios_hugetlb(pte_t *pte, unsigned long hmask,
pte_t entry;
ptl = huge_pte_lock(hstate_vma(walk->vma), walk->mm, pte);
entry = huge_ptep_get(pte);
entry = huge_ptep_get(walk->mm, addr, pte);
if (!pte_present(entry)) {
if (unlikely(is_hugetlb_entry_migration(entry)))
qp->nr_failed++;

4
mm/migrate.c
View File

@ -338,14 +338,14 @@ void migration_entry_wait(struct mm_struct *mm, pmd_t *pmd,
*
* This function will release the vma lock before returning.
*/
void migration_entry_wait_huge(struct vm_area_struct *vma, pte_t *ptep)
void migration_entry_wait_huge(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
{
spinlock_t *ptl = huge_pte_lockptr(hstate_vma(vma), vma->vm_mm, ptep);
pte_t pte;
hugetlb_vma_assert_locked(vma);
spin_lock(ptl);
pte = huge_ptep_get(ptep);
pte = huge_ptep_get(vma->vm_mm, addr, ptep);
if (unlikely(!is_hugetlb_entry_migration(pte))) {
spin_unlock(ptl);

2
mm/mincore.c
View File

@ -33,7 +33,7 @@ static int mincore_hugetlb(pte_t *pte, unsigned long hmask, unsigned long addr,
* Hugepages under user process are always in RAM and never
* swapped out, but theoretically it needs to be checked.
*/
present = pte && !huge_pte_none_mostly(huge_ptep_get(pte));
present = pte && !huge_pte_none_mostly(huge_ptep_get(walk->mm, addr, pte));
for (; addr != end; vec++, addr += PAGE_SIZE)
*vec = present;
walk->private = vec;

2
mm/userfaultfd.c
View File

@ -587,7 +587,7 @@ static __always_inline ssize_t mfill_atomic_hugetlb(
}
if (!uffd_flags_mode_is(flags, MFILL_ATOMIC_CONTINUE) &&
!huge_pte_none_mostly(huge_ptep_get(dst_pte))) {
!huge_pte_none_mostly(huge_ptep_get(dst_mm, dst_addr, dst_pte))) {
err = -EEXIST;
hugetlb_vma_unlock_read(dst_vma);
mutex_unlock(&hugetlb_fault_mutex_table[hash]);