userfaultfd: shmem: allow registration of shared memory ranges

Expand the userfaultfd_register/unregister routines to allow shared memory VMAs. Currently, there is no UFFDIO_ZEROPAGE and write-protection support for shared memory VMAs, which is reflected in ioctl methods supported by uffdio_register.

Mike Rapoport committed 9 years ago

Commit cac67321 parent cfda0523 files · +9 −16Browse files

Showing the changes to include/uapi/linux (1 of 3 files). Show all

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include/uapi/linux/userfaultfd.h+1−1

@@ -30,7 +30,7 @@ · 29 unmodified lines
30	((__u64)1 << _UFFDIO_WAKE \| \	30	((__u64)1 << _UFFDIO_WAKE \| \
31	(__u64)1 << _UFFDIO_COPY \| \	31	(__u64)1 << _UFFDIO_COPY \| \
32	(__u64)1 << _UFFDIO_ZEROPAGE)	32	(__u64)1 << _UFFDIO_ZEROPAGE)
33	#define UFFD_API_RANGE_IOCTLS_HPAGE \	33	#define UFFD_API_RANGE_IOCTLS_BASIC \
34	((__u64)1 << _UFFDIO_WAKE \| \	34	((__u64)1 << _UFFDIO_WAKE \| \
35	(__u64)1 << _UFFDIO_COPY)	35	(__u64)1 << _UFFDIO_COPY)
36		36