On Tue, 7 Feb 2017 17:33:47 +0300 "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx> wrote: > lock_pte_protection() uses pmd_lock() to make sure that we have stable > PTE page table before walking pte range. > > That's not necessary. We only need to make sure that PTE page table is > established. It cannot vanish under us as long as we hold mmap_sem at > least for read. > > And we already have helper for that -- pmd_trans_unstable(). http://ozlabs.org/~akpm/mmots/broken-out/mm-mprotect-use-pmd_trans_unstable-instead-of-taking-the-pmd_lock.patch already did this? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
