The Intel MPX API was removed from Linux 5.4. See Linux
commit f240652b6032 ("x86/mpx: Remove MPX APIs")
Document this change.
Signed-off-by: Dave Martin <Dave.Martin@xxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
man2/prctl.2 | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/man2/prctl.2 b/man2/prctl.2
index 7a3fc5c..a84fb1d 100644
--- a/man2/prctl.2
+++ b/man2/prctl.2
@@ -784,7 +784,7 @@ option enabled.
.RE
.\" prctl PR_MPX_ENABLE_MANAGEMENT
.TP
-.BR PR_MPX_ENABLE_MANAGEMENT ", " PR_MPX_DISABLE_MANAGEMENT " (since Linux 3.19) "
+.BR PR_MPX_ENABLE_MANAGEMENT ", " PR_MPX_DISABLE_MANAGEMENT " (since Linux 3.19, removed in Linux 5.4; only on x86) "
.\" commit fe3d197f84319d3bce379a9c0dc17b1f48ad358c
.\" See also http://lwn.net/Articles/582712/
.\" See also https://gcc.gnu.org/wiki/Intel%20MPX%20support%20in%20the%20GCC%20compiler
@@ -859,6 +859,12 @@ had been called.
.IP
For further information on Intel MPX, see the kernel source file
.IR Documentation/x86/intel_mpx.txt .
+.IP
+.\" commit f240652b6032b48ad7fa35c5e701cc4c8d697c0b
+.\" See also https://lkml.kernel.org/r/20190705175321.DB42F0AD@xxxxxxxxxxxxxxxxxx
+Due to a lack of toolchain support,
+.BR PR_MPX_ENABLE_MANAGEMENT " and " PR_MPX_DISABLE_MANAGEMENT
+are not supported by Linux 5.4 or later.
.\" prctl PR_SET_NAME
.TP
.BR PR_SET_NAME " (since Linux 2.6.9)"
--
2.1.4
