diff options
Diffstat (limited to 'Documentation/vm/userfaultfd.txt')
| -rw-r--r-- | Documentation/vm/userfaultfd.txt | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/Documentation/vm/userfaultfd.txt b/Documentation/vm/userfaultfd.txt index 90912925425e..70a3c94d1941 100644 --- a/Documentation/vm/userfaultfd.txt +++ b/Documentation/vm/userfaultfd.txt @@ -46,11 +46,13 @@ is a corner case that would currently return -EBUSY). When first opened the userfaultfd must be enabled invoking the UFFDIO_API ioctl specifying a uffdio_api.api value set to UFFD_API (or a later API version) which will specify the read/POLLIN protocol -userland intends to speak on the UFFD. The UFFDIO_API ioctl if -successful (i.e. if the requested uffdio_api.api is spoken also by the -running kernel), will return into uffdio_api.features and -uffdio_api.ioctls two 64bit bitmasks of respectively the activated -feature of the read(2) protocol and the generic ioctl available. +userland intends to speak on the UFFD and the uffdio_api.features +userland requires. The UFFDIO_API ioctl if successful (i.e. if the +requested uffdio_api.api is spoken also by the running kernel and the +requested features are going to be enabled) will return into +uffdio_api.features and uffdio_api.ioctls two 64bit bitmasks of +respectively all the available features of the read(2) protocol and +the generic ioctl available. Once the userfaultfd has been enabled the UFFDIO_REGISTER ioctl should be invoked (if present in the returned uffdio_api.ioctls bitmask) to |