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| author | Mike Rapoport <rppt@linux.vnet.ibm.com> | 2017-02-22 15:43:22 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-02-22 16:41:28 -0800 |
| commit | ba6907db6de17cf90c4fc67f3eb1d1d37dd0b7ac (patch) | |
| tree | 3276c0440ef2e4ba611fc5b235d0567a3b0e1fb4 /fs/userfaultfd.c | |
| parent | 163e11bc4f6ebbfcfdf751c108bd212a26e492ee (diff) | |
| download | lwn-ba6907db6de17cf90c4fc67f3eb1d1d37dd0b7ac.tar.gz lwn-ba6907db6de17cf90c4fc67f3eb1d1d37dd0b7ac.zip | |
userfaultfd: introduce vma_can_userfault
Check whether a VMA can be used with userfault in more compact way
Link: http://lkml.kernel.org/r/20161216144821.5183-28-aarcange@redhat.com
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com>
Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Cc: Michael Rapoport <RAPOPORT@il.ibm.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/userfaultfd.c')
| -rw-r--r-- | fs/userfaultfd.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c index 11b5e65e8fba..593135c296bc 100644 --- a/fs/userfaultfd.c +++ b/fs/userfaultfd.c @@ -1096,6 +1096,11 @@ static __always_inline int validate_range(struct mm_struct *mm, return 0; } +static inline bool vma_can_userfault(struct vm_area_struct *vma) +{ + return vma_is_anonymous(vma) || is_vm_hugetlb_page(vma); +} + static int userfaultfd_register(struct userfaultfd_ctx *ctx, unsigned long arg) { @@ -1185,7 +1190,7 @@ static int userfaultfd_register(struct userfaultfd_ctx *ctx, /* check not compatible vmas */ ret = -EINVAL; - if (!vma_is_anonymous(cur) && !is_vm_hugetlb_page(cur)) + if (!vma_can_userfault(cur)) goto out_unlock; /* * If this vma contains ending address, and huge pages @@ -1229,7 +1234,7 @@ static int userfaultfd_register(struct userfaultfd_ctx *ctx, do { cond_resched(); - BUG_ON(!vma_is_anonymous(vma) && !is_vm_hugetlb_page(vma)); + BUG_ON(!vma_can_userfault(vma)); BUG_ON(vma->vm_userfaultfd_ctx.ctx && vma->vm_userfaultfd_ctx.ctx != ctx); @@ -1367,7 +1372,7 @@ static int userfaultfd_unregister(struct userfaultfd_ctx *ctx, * provides for more strict behavior to notice * unregistration errors. */ - if (!vma_is_anonymous(cur) && !is_vm_hugetlb_page(cur)) + if (!vma_can_userfault(cur)) goto out_unlock; found = true; @@ -1381,7 +1386,7 @@ static int userfaultfd_unregister(struct userfaultfd_ctx *ctx, do { cond_resched(); - BUG_ON(!vma_is_anonymous(vma) && !is_vm_hugetlb_page(vma)); + BUG_ON(!vma_can_userfault(vma)); /* * Nothing to do: this vma is already registered into this |