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ioctl_userfaultfd.2: Note that UFFDIO_UNREGISTER address range must be compatible 

Reported-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2017-04-21 09:11:15 +02:00
parent d87f377e4e
commit 1c63cefda2
1 changed files with 8 additions and 0 deletions
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8
man2/ioctl_userfaultfd.2
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@ -160,6 +160,11 @@ field was not zero.
.\" FIXME In the above error case, the returned 'uffdio_api' structure is .\" FIXME In the above error case, the returned 'uffdio_api' structure is
.\" zeroed out. Why is this done? This should be explained in the manual page. .\" zeroed out. Why is this done? This should be explained in the manual page.
.\" .\"
.\" Mike Rapoport:
.\" In my understanding the uffdio_api
.\" structure is zeroed to allow the caller
.\" to distinguish the reasons for -EINVAL.
.\"
.SS UFFDIO_REGISTER .SS UFFDIO_REGISTER
(Since Linux 4.3.) (Since Linux 4.3.)
Register a memory address range with the userfaultfd object. Register a memory address range with the userfaultfd object.
@ -269,6 +274,9 @@ There as an incompatible mapping in the specified address range.
.SS UFFDIO_UNREGISTER .SS UFFDIO_UNREGISTER
(Since Linux 4.3.) (Since Linux 4.3.)
Unregister a memory address range from userfaultfd. Unregister a memory address range from userfaultfd.
The pages in the range must be "compatible" (see the description of
.BR UFFDIO_REGISTER .)
The address range to unregister is specified in the The address range to unregister is specified in the
.IR uffdio_range .IR uffdio_range
structure pointed to by structure pointed to by