Revert "BACKPORT: FROMGIT: mm: improve mprotect(R|W) efficiency on pages referenced once"
This reverts commit 6c376abc01
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Reason for revert: Breaks CTS
Change-Id: I606cda34b58abb44d2f2bfc085a644dcf8ea7a25
Signed-off-by: Quentin Perret <qperret@google.com>
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1 changed files with 0 additions and 6 deletions
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@ -44,8 +44,6 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
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spinlock_t *ptl;
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unsigned long pages = 0;
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int target_node = NUMA_NO_NODE;
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bool anon_writable =
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vma_is_anonymous(vma) && (vma->vm_flags & VM_WRITE);
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/*
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* Can be called with only the mmap_sem for reading by
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@ -122,11 +120,7 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
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(pte_soft_dirty(ptent) ||
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!(vma->vm_flags & VM_SOFTDIRTY))) {
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ptent = pte_mkwrite(ptent);
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} else if (anon_writable &&
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page_mapcount(pte_page(ptent)) == 1) {
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ptent = pte_mkwrite(ptent);
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}
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ptep_modify_prot_commit(mm, addr, pte, ptent);
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pages++;
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} else if (IS_ENABLED(CONFIG_MIGRATION)) {
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