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prctl.2: Minor fixups 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2018-05-28 12:21:57 +02:00
parent ac3756bc53
commit 2feab5d3b1
1 changed files with 17 additions and 17 deletions
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34
man2/prctl.2
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@ -1013,14 +1013,15 @@ Returns the state of the speculation misfeature which is selected with
the value of
.IR arg2 ,
which must be
.BR PR_SPEC_STORE_BYPASS .
Otherwise the call fails with the error
.BR ENODEV .
The return value uses bit 0-3 with the following meaning:
.BR PR_SPEC_STORE_BYPASS
(otherwise the call fails with the error
.BR ENODEV ).
.IP
The return value uses bits 0-3 with the following meaning:
.RS
.TP
.BR PR_SPEC_PRCTL
Mitigation can be controlled per task by
Mitigation can be controlled per thread by
.B PR_SET_SPECULATION_CTRL
.TP
.BR PR_SPEC_ENABLE
@ -1035,13 +1036,12 @@ Same as
but cannot be undone.
.RE
.IP
If all bits are
0
If all bits are 0,
then the CPU is not affected by the speculation misfeature.
.IP
If
.B PR_SPEC_PRCTL
is set, then the per task control of the mitigation is available.
is set, then per-thread control of the mitigation is available.
If not set,
.BR prctl ()
for the speculation misfeature will fail.
@ -1058,13 +1058,13 @@ Sets the state of the speculation misfeature which is selected with
the value of
.IR arg2 ,
which must be
.B PR_SPEC_STORE_BYPASS.
Otherwise the call fails with the error
.BR ENODEV .
This control is per task.
.B PR_SPEC_STORE_BYPASS
(otherwise the call fails with the error
.BR ENODEV ).
This control is per thread.
The
.IR arg3
is used to hand in the control value, which can be either:
argument is used to hand in the control value, which can be either:
.RS
.TP
.BR PR_SPEC_ENABLE
@ -1080,19 +1080,19 @@ but cannot be undone.
A subsequent
.B
prctl(..., PR_SPEC_ENABLE)
will fail with
will fail with the error
.BR EPERM .
.RE
.IP
Any other value in
.IR arg3
will result in the call failure with the error
will result in the call failing with the error
.BR ERANGE .
Also
.I arg4,
.I arg4
and
.I arg5
must be specified as 0, otherwise the call fails with ethe rror
must be specified as 0, otherwise the call fails with the rror
.BR EINVAL .
.IP
Furtheremore this speculation feature can also be controlled by the boot-time