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Revert "ANDROID: mm: remove sequence counting when mmap_lock is not exclusively owned"

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This reverts commit ad939deb18.

Change-Id: I210d9aa077b3b68916166d2b5265ef0600c5e3bb
Signed-off-by: Alexander Winkowski <dereference23@outlook.com>
This commit is contained in:
Alexander Winkowski 2024-01-12 04:56:23 +00:00
commit 924ed5256e
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GPG key ID: 72762A66704CDE44
3 changed files with 10 additions and 0 deletions
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6
mm/madvise.c
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@ -501,9 +501,11 @@ static void madvise_cold_page_range(struct mmu_gather *tlb,
.target_task = task,
};
vm_write_begin(vma);
tlb_start_vma(tlb, vma);
walk_page_range(vma->vm_mm, addr, end, &cold_walk_ops, &walk_private);
tlb_end_vma(tlb, vma);
vm_write_end(vma);
}
static long madvise_cold(struct task_struct *task,
@ -537,9 +539,11 @@ static void madvise_pageout_page_range(struct mmu_gather *tlb,
.target_task = task,
};
vm_write_begin(vma);
tlb_start_vma(tlb, vma);
walk_page_range(vma->vm_mm, addr, end, &cold_walk_ops, &walk_private);
tlb_end_vma(tlb, vma);
vm_write_end(vma);
}
static inline bool can_do_pageout(struct vm_area_struct *vma)
@ -742,10 +746,12 @@ static int madvise_free_single_vma(struct vm_area_struct *vma,
update_hiwater_rss(mm);
mmu_notifier_invalidate_range_start(&range);
vm_write_begin(vma);
tlb_start_vma(&tlb, vma);
walk_page_range(vma->vm_mm, range.start, range.end,
&madvise_free_walk_ops, &tlb);
tlb_end_vma(&tlb, vma);
vm_write_end(vma);
mmu_notifier_invalidate_range_end(&range);
tlb_finish_mmu(&tlb, range.start, range.end);

2
mm/memory.c
View file

@ -1293,6 +1293,7 @@ void unmap_page_range(struct mmu_gather *tlb,
unsigned long next;
BUG_ON(addr >= end);
vm_write_begin(vma);
tlb_start_vma(tlb, vma);
pgd = pgd_offset(vma->vm_mm, addr);
do {
@ -1302,6 +1303,7 @@ void unmap_page_range(struct mmu_gather *tlb,
next = zap_p4d_range(tlb, vma, pgd, addr, next, details);
} while (pgd++, addr = next, addr != end);
tlb_end_vma(tlb, vma);
vm_write_end(vma);
}

2
mm/mempolicy.c
View file

@ -600,9 +600,11 @@ unsigned long change_prot_numa(struct vm_area_struct *vma,
{
int nr_updated;
vm_write_begin(vma);
nr_updated = change_protection(vma, addr, end, PAGE_NONE, 0, 1);
if (nr_updated)
count_vm_numa_events(NUMA_PTE_UPDATES, nr_updated);
vm_write_end(vma);
return nr_updated;
}