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Subject[PATCH 4.9 66/87] Documentation/spec_ctrl: Do some minor cleanups
4.9-stable review patch.  If anyone has any objections, please let me know.


From: Borislav Petkov <>

commit dd0792699c4058e63c0715d9a7c2d40226fcdddc upstream

Fix some typos, improve formulations, end sentences with a fullstop.

Signed-off-by: Borislav Petkov <>
Signed-off-by: Thomas Gleixner <>
Signed-off-by: David Woodhouse <>
Signed-off-by: Greg Kroah-Hartman <>
Documentation/spec_ctrl.txt | 24 ++++++++++++------------
1 file changed, 12 insertions(+), 12 deletions(-)

--- a/Documentation/spec_ctrl.txt
+++ b/Documentation/spec_ctrl.txt
@@ -2,13 +2,13 @@
Speculation Control

-Quite some CPUs have speculation related misfeatures which are in fact
-vulnerabilites causing data leaks in various forms even accross privilege
+Quite some CPUs have speculation-related misfeatures which are in
+fact vulnerabilities causing data leaks in various forms even across
+privilege domains.

The kernel provides mitigation for such vulnerabilities in various
-forms. Some of these mitigations are compile time configurable and some on
-the kernel command line.
+forms. Some of these mitigations are compile-time configurable and some
+can be supplied on the kernel command line.

There is also a class of mitigations which are very expensive, but they can
be restricted to a certain set of processes or tasks in controlled
@@ -32,18 +32,18 @@ the following meaning:
Bit Define Description
==== ===================== ===================================================
0 PR_SPEC_PRCTL Mitigation can be controlled per task by
1 PR_SPEC_ENABLE The speculation feature is enabled, mitigation is
- disabled
+ disabled.
2 PR_SPEC_DISABLE The speculation feature is disabled, mitigation is
- enabled
+ enabled.
3 PR_SPEC_FORCE_DISABLE Same as PR_SPEC_DISABLE, but cannot be undone. A
subsequent prctl(..., PR_SPEC_ENABLE) will fail.
==== ===================== ===================================================

If all bits are 0 the CPU is not affected by the speculation misfeature.

-If PR_SPEC_PRCTL is set, then the per task control of the mitigation is
+If PR_SPEC_PRCTL is set, then the per-task control of the mitigation is
available. If not set, prctl(PR_SET_SPECULATION_CTRL) for the speculation
misfeature will fail.

@@ -61,9 +61,9 @@ Common error codes
Value Meaning
======= =================================================================
EINVAL The prctl is not implemented by the architecture or unused
- prctl(2) arguments are not 0
+ prctl(2) arguments are not 0.

-ENODEV arg2 is selecting a not supported speculation misfeature
+ENODEV arg2 is selecting a not supported speculation misfeature.
======= =================================================================

@@ -74,7 +74,7 @@ Value Meaning
0 Success

ERANGE arg3 is incorrect, i.e. it's neither PR_SPEC_ENABLE nor

ENXIO Control of the selected speculation misfeature is not possible.

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