diff options
| author | Mike Rapoport <rppt@linux.vnet.ibm.com> | 2017-09-06 16:23:12 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-09-06 17:27:28 -0700 |
| commit | ce53e8e6f2cb02d69f0a1d7954e10d3231bc75f5 (patch) | |
| tree | cffa940f27e189853b3afd76c49f977eb30d6a93 /fs | |
| parent | 8fb44e5403ca86e33411dfa12dd298ed5ab1c3f7 (diff) | |
| download | linux-ce53e8e6f2cb02d69f0a1d7954e10d3231bc75f5.tar.bz2 | |
userfaultfd: report UFFDIO_ZEROPAGE as available for shmem VMAs
Now when shmem VMAs can be filled with zero page via userfaultfd we can
report that UFFDIO_ZEROPAGE is available for those VMAs
Link: http://lkml.kernel.org/r/1497939652-16528-7-git-send-email-rppt@linux.vnet.ibm.com
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hillf Danton <hillf.zj@alibaba-inc.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/userfaultfd.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c index 886085b47c75..01a85e2660b8 100644 --- a/fs/userfaultfd.c +++ b/fs/userfaultfd.c @@ -1194,7 +1194,7 @@ static int userfaultfd_register(struct userfaultfd_ctx *ctx, struct uffdio_register __user *user_uffdio_register; unsigned long vm_flags, new_flags; bool found; - bool non_anon_pages; + bool basic_ioctls; unsigned long start, end, vma_end; user_uffdio_register = (struct uffdio_register __user *) arg; @@ -1260,7 +1260,7 @@ static int userfaultfd_register(struct userfaultfd_ctx *ctx, * Search for not compatible vmas. */ found = false; - non_anon_pages = false; + basic_ioctls = false; for (cur = vma; cur && cur->vm_start < end; cur = cur->vm_next) { cond_resched(); @@ -1299,8 +1299,8 @@ static int userfaultfd_register(struct userfaultfd_ctx *ctx, /* * Note vmas containing huge pages */ - if (is_vm_hugetlb_page(cur) || vma_is_shmem(cur)) - non_anon_pages = true; + if (is_vm_hugetlb_page(cur)) + basic_ioctls = true; found = true; } @@ -1371,7 +1371,7 @@ out_unlock: * userland which ioctls methods are guaranteed to * succeed on this range. */ - if (put_user(non_anon_pages ? UFFD_API_RANGE_IOCTLS_BASIC : + if (put_user(basic_ioctls ? UFFD_API_RANGE_IOCTLS_BASIC : UFFD_API_RANGE_IOCTLS, &user_uffdio_register->ioctls)) ret = -EFAULT; |