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mm/mmu_notifier: remove unused mmu_notifier_range_update_to_read_only export 

mmu_notifier_range_update_to_read_only() was originally introduced in
commit c6d23413f8 ("mm/mmu_notifier:
mmu_notifier_range_update_to_read_only() helper") as an optimisation for
device drivers that know a range has only been mapped read-only.  However
there are no users of this feature so remove it.  As it is the only user
of the struct mmu_notifier_range.vma field remove that also.

Link: https://lkml.kernel.org/r/20230110025722.600912-1-apopple@nvidia.com
Signed-off-by: Alistair Popple <apopple@nvidia.com>
Acked-by: Mike Rapoport (IBM) <rppt@kernel.org>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Alistair Popple 2023-01-10 13:57:22 +11:00 committed by Andrew Morton
parent 9e5522715e
commit 7d4a8be0c4
16 changed files with 37 additions and 52 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/proc/task_mmu.c
View File

@ -1306,7 +1306,7 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf,
inc_tlb_flush_pending(mm);
mmu_notifier_range_init(&range, MMU_NOTIFY_SOFT_DIRTY,
0, NULL, mm, 0, -1UL);
0, mm, 0, -1UL);
mmu_notifier_invalidate_range_start(&range);
}
walk_page_range(mm, 0, -1, &clear_refs_walk_ops, &cp);

13
include/linux/mmu_notifier.h
View File

@ -269,7 +269,6 @@ extern struct lockdep_map __mmu_notifier_invalidate_range_start_map;
#endif
struct mmu_notifier_range {
struct vm_area_struct *vma;
struct mm_struct *mm;
unsigned long start;
unsigned long end;
@ -514,12 +513,10 @@ static inline void mmu_notifier_subscriptions_destroy(struct mm_struct *mm)
static inline void mmu_notifier_range_init(struct mmu_notifier_range *range,
enum mmu_notifier_event event,
unsigned flags,
struct vm_area_struct *vma,
struct mm_struct *mm,
unsigned long start,
unsigned long end)
{
range->vma = vma;
range->event = event;
range->mm = mm;
range->start = start;
@ -530,10 +527,10 @@ static inline void mmu_notifier_range_init(struct mmu_notifier_range *range,
static inline void mmu_notifier_range_init_owner(
struct mmu_notifier_range *range,
enum mmu_notifier_event event, unsigned int flags,
struct vm_area_struct *vma, struct mm_struct *mm,
unsigned long start, unsigned long end, void *owner)
struct mm_struct *mm, unsigned long start,
unsigned long end, void *owner)
{
mmu_notifier_range_init(range, event, flags, vma, mm, start, end);
mmu_notifier_range_init(range, event, flags, mm, start, end);
range->owner = owner;
}
@ -659,9 +656,9 @@ static inline void _mmu_notifier_range_init(struct mmu_notifier_range *range,
range->end = end;
}
#define mmu_notifier_range_init(range,event,flags,vma,mm,start,end) \
#define mmu_notifier_range_init(range,event,flags,mm,start,end) \
_mmu_notifier_range_init(range, start, end)
#define mmu_notifier_range_init_owner(range, event, flags, vma, mm, start, \
#define mmu_notifier_range_init_owner(range, event, flags, mm, start, \
end, owner) \
_mmu_notifier_range_init(range, start, end)

2
kernel/events/uprobes.c
View File

@ -161,7 +161,7 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr,
int err;
struct mmu_notifier_range range;
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, mm, addr,
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, mm, addr,
addr + PAGE_SIZE);
if (new_page) {

4
mm/huge_memory.c
View File

@ -2020,7 +2020,7 @@ void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud,
spinlock_t *ptl;
struct mmu_notifier_range range;
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, vma->vm_mm,
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma->vm_mm,
address & HPAGE_PUD_MASK,
(address & HPAGE_PUD_MASK) + HPAGE_PUD_SIZE);
mmu_notifier_invalidate_range_start(&range);
@ -2282,7 +2282,7 @@ void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
spinlock_t *ptl;
struct mmu_notifier_range range;
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, vma->vm_mm,
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma->vm_mm,
address & HPAGE_PMD_MASK,
(address & HPAGE_PMD_MASK) + HPAGE_PMD_SIZE);
mmu_notifier_invalidate_range_start(&range);

12
mm/hugetlb.c
View File

@ -4966,7 +4966,7 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
int ret = 0;
if (cow) {
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, src_vma, src,
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, src,
src_vma->vm_start,
src_vma->vm_end);
mmu_notifier_invalidate_range_start(&range);
@ -5177,7 +5177,7 @@ int move_hugetlb_page_tables(struct vm_area_struct *vma,
struct mmu_notifier_range range;
bool shared_pmd = false;
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, mm, old_addr,
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, mm, old_addr,
old_end);
adjust_range_if_pmd_sharing_possible(vma, &range.start, &range.end);
/*
@ -5391,7 +5391,7 @@ void unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start,
struct mmu_notifier_range range;
struct mmu_gather tlb;
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, vma->vm_mm,
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma->vm_mm,
start, end);
adjust_range_if_pmd_sharing_possible(vma, &range.start, &range.end);
mmu_notifier_invalidate_range_start(&range);
@ -5597,7 +5597,7 @@ retry_avoidcopy:
pages_per_huge_page(h));
__SetPageUptodate(new_page);
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, mm, haddr,
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, mm, haddr,
haddr + huge_page_size(h));
mmu_notifier_invalidate_range_start(&range);
@ -6637,7 +6637,7 @@ long hugetlb_change_protection(struct vm_area_struct *vma,
* range if PMD sharing is possible.
*/
mmu_notifier_range_init(&range, MMU_NOTIFY_PROTECTION_VMA,
0, vma, mm, start, end);
0, mm, start, end);
adjust_range_if_pmd_sharing_possible(vma, &range.start, &range.end);
BUG_ON(address >= end);
@ -7368,7 +7368,7 @@ static void hugetlb_unshare_pmds(struct vm_area_struct *vma,
* No need to call adjust_range_if_pmd_sharing_possible(), because
* we have already done the PUD_SIZE alignment.
*/
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, mm,
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, mm,
start, end);
mmu_notifier_invalidate_range_start(&range);
hugetlb_vma_lock_write(vma);

6
mm/khugepaged.c
View File

@ -1040,8 +1040,8 @@ static int collapse_huge_page(struct mm_struct *mm, unsigned long address,
anon_vma_lock_write(vma->anon_vma);
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, NULL, mm,
address, address + HPAGE_PMD_SIZE);
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, mm, address,
address + HPAGE_PMD_SIZE);
mmu_notifier_invalidate_range_start(&range);
pte = pte_offset_map(pmd, address);
@ -1412,7 +1412,7 @@ static void collapse_and_free_pmd(struct mm_struct *mm, struct vm_area_struct *v
if (vma->anon_vma)
lockdep_assert_held_write(&vma->anon_vma->root->rwsem);
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, NULL, mm, addr,
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, mm, addr,
addr + HPAGE_PMD_SIZE);
mmu_notifier_invalidate_range_start(&range);
pmd = pmdp_collapse_flush(vma, addr, pmdp);

5
mm/ksm.c
View File

@ -1057,8 +1057,7 @@ static int write_protect_page(struct vm_area_struct *vma, struct page *page,
BUG_ON(PageTransCompound(page));
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, mm,
pvmw.address,
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, mm, pvmw.address,
pvmw.address + PAGE_SIZE);
mmu_notifier_invalidate_range_start(&range);
@ -1164,7 +1163,7 @@ static int replace_page(struct vm_area_struct *vma, struct page *page,
if (!pmd_present(pmde) || pmd_trans_huge(pmde))
goto out;
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, mm, addr,
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, mm, addr,
addr + PAGE_SIZE);
mmu_notifier_invalidate_range_start(&range);

2
mm/madvise.c
View File

@ -765,7 +765,7 @@ static int madvise_free_single_vma(struct vm_area_struct *vma,
range.end = min(vma->vm_end, end_addr);
if (range.end <= vma->vm_start)
return -EINVAL;
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, mm,
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, mm,
range.start, range.end);
lru_add_drain();

2
mm/mapping_dirty_helpers.c
View File

@ -191,7 +191,7 @@ static int wp_clean_pre_vma(unsigned long start, unsigned long end,
wpwalk->tlbflush_end = start;
mmu_notifier_range_init(&wpwalk->range, MMU_NOTIFY_PROTECTION_PAGE, 0,
walk->vma, walk->mm, start, end);
walk->mm, start, end);
mmu_notifier_invalidate_range_start(&wpwalk->range);
flush_cache_range(walk->vma, start, end);

10
mm/memory.c
View File

@ -1266,7 +1266,7 @@ copy_page_range(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma)
if (is_cow) {
mmu_notifier_range_init(&range, MMU_NOTIFY_PROTECTION_PAGE,
0, src_vma, src_mm, addr, end);
0, src_mm, addr, end);
mmu_notifier_invalidate_range_start(&range);
/*
* Disabling preemption is not needed for the write side, as
@ -1683,7 +1683,7 @@ void unmap_vmas(struct mmu_gather *tlb, struct maple_tree *mt,
};
MA_STATE(mas, mt, vma->vm_end, vma->vm_end);
mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, 0, vma, vma->vm_mm,
mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, 0, vma->vm_mm,
start_addr, end_addr);
mmu_notifier_invalidate_range_start(&range);
do {
@ -1709,7 +1709,7 @@ void zap_page_range_single(struct vm_area_struct *vma, unsigned long address,
struct mmu_gather tlb;
lru_add_drain();
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, vma->vm_mm,
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma->vm_mm,
address, end);
if (is_vm_hugetlb_page(vma))
adjust_range_if_pmd_sharing_possible(vma, &range.start,
@ -3091,7 +3091,7 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf)
__SetPageUptodate(new_page);
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, mm,
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, mm,
vmf->address & PAGE_MASK,
(vmf->address & PAGE_MASK) + PAGE_SIZE);
mmu_notifier_invalidate_range_start(&range);
@ -3561,7 +3561,7 @@ static vm_fault_t remove_device_exclusive_entry(struct vm_fault *vmf)
if (!folio_lock_or_retry(folio, vma->vm_mm, vmf->flags))
return VM_FAULT_RETRY;
mmu_notifier_range_init_owner(&range, MMU_NOTIFY_EXCLUSIVE, 0, vma,
mmu_notifier_range_init_owner(&range, MMU_NOTIFY_EXCLUSIVE, 0,
vma->vm_mm, vmf->address & PAGE_MASK,
(vmf->address & PAGE_MASK) + PAGE_SIZE, NULL);
mmu_notifier_invalidate_range_start(&range);

4
mm/migrate_device.c
View File

@ -306,7 +306,7 @@ static void migrate_vma_collect(struct migrate_vma *migrate)
* private page mappings that won't be migrated.
*/
mmu_notifier_range_init_owner(&range, MMU_NOTIFY_MIGRATE, 0,
migrate->vma, migrate->vma->vm_mm, migrate->start, migrate->end,
migrate->vma->vm_mm, migrate->start, migrate->end,
migrate->pgmap_owner);
mmu_notifier_invalidate_range_start(&range);
@ -733,7 +733,7 @@ static void __migrate_device_pages(unsigned long *src_pfns,
notified = true;
mmu_notifier_range_init_owner(&range,
MMU_NOTIFY_MIGRATE, 0, migrate->vma,
MMU_NOTIFY_MIGRATE, 0,
migrate->vma->vm_mm, addr, migrate->end,
migrate->pgmap_owner);
mmu_notifier_invalidate_range_start(&range);

10
mm/mmu_notifier.c
View File

@ -1120,13 +1120,3 @@ void mmu_notifier_synchronize(void)
synchronize_srcu(&srcu);
}
EXPORT_SYMBOL_GPL(mmu_notifier_synchronize);
bool
mmu_notifier_range_update_to_read_only(const struct mmu_notifier_range *range)
{
if (!range->vma || range->event != MMU_NOTIFY_PROTECTION_VMA)
return false;
/* Return true if the vma still have the read flag set. */
return range->vma->vm_flags & VM_READ;
}
EXPORT_SYMBOL_GPL(mmu_notifier_range_update_to_read_only);

2
mm/mprotect.c
View File

@ -398,7 +398,7 @@ static inline long change_pmd_range(struct mmu_gather *tlb,
if (!range.start) {
mmu_notifier_range_init(&range,
MMU_NOTIFY_PROTECTION_VMA, 0,
vma, vma->vm_mm, addr, end);
vma->vm_mm, addr, end);
mmu_notifier_invalidate_range_start(&range);
}

2
mm/mremap.c
View File

@ -498,7 +498,7 @@ unsigned long move_page_tables(struct vm_area_struct *vma,
new_addr, len);
flush_cache_range(vma, old_addr, old_end);
mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, 0, vma, vma->vm_mm,
mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, 0, vma->vm_mm,
old_addr, old_end);
mmu_notifier_invalidate_range_start(&range);

2
mm/oom_kill.c
View File

@ -542,7 +542,7 @@ static bool __oom_reap_task_mm(struct mm_struct *mm)
struct mmu_gather tlb;
mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, 0,
vma, mm, vma->vm_start,
mm, vma->vm_start,
vma->vm_end);
tlb_gather_mmu(&tlb, mm);
if (mmu_notifier_invalidate_range_start_nonblock(&range)) {

11
mm/rmap.c
View File

@ -944,9 +944,8 @@ static int page_vma_mkclean_one(struct page_vma_mapped_walk *pvmw)
* We have to assume the worse case ie pmd for invalidation. Note that
* the folio can not be freed from this function.
*/
mmu_notifier_range_init(&range, MMU_NOTIFY_PROTECTION_PAGE,
0, vma, vma->vm_mm, address,
vma_address_end(pvmw));
mmu_notifier_range_init(&range, MMU_NOTIFY_PROTECTION_PAGE, 0,
vma->vm_mm, address, vma_address_end(pvmw));
mmu_notifier_invalidate_range_start(&range);
while (page_vma_mapped_walk(pvmw)) {
@ -1475,7 +1474,7 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma,
* try_to_unmap() must hold a reference on the folio.
*/
range.end = vma_address_end(&pvmw);
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, vma->vm_mm,
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma->vm_mm,
address, range.end);
if (folio_test_hugetlb(folio)) {
/*
@ -1850,7 +1849,7 @@ static bool try_to_migrate_one(struct folio *folio, struct vm_area_struct *vma,
* try_to_unmap() must hold a reference on the page.
*/
range.end = vma_address_end(&pvmw);
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, vma->vm_mm,
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma->vm_mm,
address, range.end);
if (folio_test_hugetlb(folio)) {
/*
@ -2180,7 +2179,7 @@ static bool page_make_device_exclusive_one(struct folio *folio,
swp_entry_t entry;
pte_t swp_pte;
mmu_notifier_range_init_owner(&range, MMU_NOTIFY_EXCLUSIVE, 0, vma,
mmu_notifier_range_init_owner(&range, MMU_NOTIFY_EXCLUSIVE, 0,
vma->vm_mm, address, min(vma->vm_end,
address + folio_size(folio)),
args->owner);