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ioctl_userfaultfd.2: Rework version information for feature bits 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2017-10-18 10:39:34 +02:00
parent e81833beb2
commit 364270d01f
1 changed files with 8 additions and 9 deletions
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17
man2/ioctl_userfaultfd.2
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@ -136,9 +136,9 @@ structure and return
.BR EINVAL .
.\" FIXME add more details about feature negotiation and enablement
.PP
Since Linux 4.11, the following feature bits may be set:
The following feature bits may be set:
.TP
.B UFFD_FEATURE_EVENT_FORK
.BR UFFD_FEATURE_EVENT_FORK " (since Linux 4.11)"
When this feature is enabled,
the userfaultfd objects associated with a parent process are duplicated
into the child process during
@ -147,14 +147,14 @@ and a
.B UFFD_EVENT_FORK
event is delivered to the userfaultfd monitor
.TP
.B UFFD_FEATURE_EVENT_REMAP
.BR UFFD_FEATURE_EVENT_REMAP " (since Linux 4.11)"
If this feature is enabled,
when the faulting process invokes
.BR mremap (2),
the userfaultfd monitor will receive an event of type
.BR UFFD_EVENT_REMAP .
.TP
.B UFFD_FEATURE_EVENT_REMOVE
.BR UFFD_FEATURE_EVENT_REMOVE " (since Linux 4.11)"
If this feature is enabled,
when the faulting process calls
.BR madvise (2)
@ -166,7 +166,7 @@ advice value to free a virtual memory area
the userfaultfd monitor will receive an event of type
.BR UFFD_EVENT_REMOVE .
.TP
.B UFFD_FEATURE_EVENT_UNMAP
.BR UFFD_FEATURE_EVENT_UNMAP " (since Linux 4.11)"
If this feature is enabled,
when the faulting process unmaps virtual memory either explicitly with
.BR munmap (2),
@ -177,12 +177,12 @@ or
the userfaultfd monitor will receive an event of type
.BR UFFD_EVENT_UNMAP .
.TP
.B UFFD_FEATURE_MISSING_HUGETLBFS
.BR UFFD_FEATURE_MISSING_HUGETLBFS " (since Linux 4.11)"
If this feature bit is set,
the kernel supports registering userfaultfd ranges on hugetlbfs
virtual memory areas
.TP
.B UFFD_FEATURE_MISSING_SHMEM
.BR UFFD_FEATURE_MISSING_SHMEM " (since Linux 4.11)"
If this feature bit is set,
the kernel supports registering userfaultfd ranges on shared memory areas.
This includes all kernel shared memory APIs:
@ -197,9 +197,8 @@ flag set,
.BR memfd_create (2),
and so on.
.TP
.B UFFD_FEATURE_SIGBUS
.BR UFFD_FEATURE_SIGBUS " (since Linux 4.14)"
.\" commit 2d6d6f5a09a96cc1fec7ed992b825e05f64cb50e
Since Linux 4.14.
If this feature bit is set, no page-fault events
.RB ( UFFD_EVENT_PAGEFAULT )
will be delivered.