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Message-Id: <20221223155616.297723-1-david@redhat.com>
Date: Fri, 23 Dec 2022 16:56:14 +0100
From: David Hildenbrand <david@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org, David Hildenbrand <david@...hat.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Peter Xu <peterx@...hat.com>, Hugh Dickins <hughd@...gle.com>,
Andrea Arcangeli <aarcange@...hat.com>,
Nadav Amit <nadav.amit@...il.com>
Subject: [PATCH v1 0/2] mm: uffd-wp + change_protection() cleanups
Based on linus/master and [1]:
"mm/userfaultfd: enable writenotify while userfaultfd-wp is enabled for a
VMA"
Cleanup page protection handling in uffd-wp when calling
change_protection() and improve unprotecting uffd=wp in private mappings,
trying to set PTEs writable again if possible just like we do during
mprotect() when upgrading write permissions. Make the change_protection()
interface harder to get wrong :)
I consider both pages primarily cleanups, although patch #1 fixes a
corner case with uffd-wp and softdirty tracking for shmem. @Peter, please
let me know if we should flag patch #1 as pure cleanup -- I have no idea
how important softdirty tracking on shmem is.
Survives my simple test case + selftests/vm.
Last patch series before Christmas; happy holidays everyone!
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Peter Xu <peterx@...hat.com>
Cc: Hugh Dickins <hughd@...gle.com>
Cc: Andrea Arcangeli <aarcange@...hat.com>
Cc: Nadav Amit <nadav.amit@...il.com>
[1] https://lore.kernel.org/all/20221209080912.7968-1-david@redhat.com/T/#u
David Hildenbrand (2):
mm/userfaultfd: rely on vma->vm_page_prot in uffd_wp_range()
mm/mprotect: drop pgprot_t parameter from change_protection()
include/linux/mm.h | 3 +--
mm/mempolicy.c | 3 +--
mm/mprotect.c | 14 +++++++++++---
mm/userfaultfd.c | 17 ++++++++++++-----
4 files changed, 25 insertions(+), 12 deletions(-)
--
2.38.1
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