The patch titled
Subject: userfaultfd: documentation update
has been removed from the -mm tree. Its filename was
userfaultfd-linux-documentation-vm-userfaultfdtxt-fix.patch
This patch was dropped because it was folded into userfaultfd-linux-documentation-vm-userfaultfdtxt.patch
------------------------------------------------------
From: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Subject: userfaultfd: documentation update
Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/vm/userfaultfd.txt | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff -puN Documentation/vm/userfaultfd.txt~userfaultfd-linux-documentation-vm-userfaultfdtxt-fix Documentation/vm/userfaultfd.txt
--- a/Documentation/vm/userfaultfd.txt~userfaultfd-linux-documentation-vm-userfaultfdtxt-fix
+++ a/Documentation/vm/userfaultfd.txt
@@ -3,8 +3,8 @@
== Objective ==
Userfaults allow the implementation of on-demand paging from userland
-and more generally they allow userland to take control various memory
-page faults, something otherwise only the kernel code could do.
+and more generally they allow userland to take control of various
+memory page faults, something otherwise only the kernel code could do.
For example userfaults allows a proper and more optimal implementation
of the PROT_NONE+SIGSEGV trick.
@@ -75,7 +75,9 @@ The primary ioctl to resolve userfaults
atomically copies a page into the userfault registered range and wakes
up the blocked userfaults (unless uffdio_copy.mode &
UFFDIO_COPY_MODE_DONTWAKE is set). Other ioctl works similarly to
-UFFDIO_COPY.
+UFFDIO_COPY. They're atomic as in guaranteeing that nothing can see an
+half copied page since it'll keep userfaulting until the copy has
+finished.
== QEMU/KVM ==
_
Patches currently in -mm which might be from aarcange@xxxxxxxxxx are
userfaultfd-linux-documentation-vm-userfaultfdtxt.patch
userfaultfd-waitqueue-add-nr-wake-parameter-to-__wake_up_locked_key.patch
userfaultfd-uapi.patch
userfaultfd-uapi-add-missing-include-typesh.patch
userfaultfd-linux-userfaultfd_kh.patch
userfaultfd-add-vm_userfaultfd_ctx-to-the-vm_area_struct.patch
userfaultfd-add-vm_uffd_missing-and-vm_uffd_wp.patch
userfaultfd-call-handle_userfault-for-userfaultfd_missing-faults.patch
userfaultfd-teach-vma_merge-to-merge-across-vma-vm_userfaultfd_ctx.patch
userfaultfd-prevent-khugepaged-to-merge-if-userfaultfd-is-armed.patch
userfaultfd-add-new-syscall-to-provide-memory-externalization.patch
userfaultfd-add-new-syscall-to-provide-memory-externalization-fix.patch
userfaultfd-add-new-syscall-to-provide-memory-externalization-fix-fix.patch
userfaultfd-add-new-syscall-to-provide-memory-externalization-fix-fix-fix.patch
userfaultfd-rename-uffd_apibits-into-features-fixup.patch
userfaultfd-change-the-read-api-to-return-a-uffd_msg.patch
userfaultfd-change-the-read-api-to-return-a-uffd_msg-fix.patch
userfaultfd-change-the-read-api-to-return-a-uffd_msg-fix-2.patch
userfaultfd-wake-pending-userfaults.patch
userfaultfd-optimize-read-and-poll-to-be-o1.patch
userfaultfd-optimize-read-and-poll-to-be-o1-fix.patch
userfaultfd-allocate-the-userfaultfd_ctx-cacheline-aligned.patch
userfaultfd-solve-the-race-between-uffdio_copyzeropage-and-read.patch
userfaultfd-buildsystem-activation.patch
userfaultfd-activate-syscall.patch
userfaultfd-uffdio_copyuffdio_zeropage-uapi.patch
userfaultfd-mcopy_atomicmfill_zeropage-uffdio_copyuffdio_zeropage-preparation.patch
userfaultfd-avoid-mmap_sem-read-recursion-in-mcopy_atomic.patch
userfaultfd-uffdio_copy-and-uffdio_zeropage.patch
userfaultfd-require-uffdio_api-before-other-ioctls.patch
userfaultfd-allow-signals-to-interrupt-a-userfault.patch
userfaultfd-propagate-the-full-address-in-thp-faults.patch
userfaultfd-avoid-missing-wakeups-during-refile-in-userfaultfd_read.patch
userfaultfd-selftest.patch
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