From 03a084364dbd85403313ecd8e07ad2eba7e1f6e8 Mon Sep 17 00:00:00 2001
From: Erik Bosman <ebn310@few.vu.nl>
Date: Fri, 11 Apr 2008 18:54:17 +0200
Subject: [PATCH] --- yaml --- r: 90981 b: refs/heads/master c:
 8fb402bccf203ecca8f9e0202b8fd3c937dece6f h: refs/heads/master i:   90979:
 cb6fb4e2c1ab8ed88c237883d5d716a8c3e01667 v: v3

---
 [refs]                      |  2 +-
 trunk/include/linux/prctl.h |  6 ++++++
 trunk/kernel/sys.c          | 13 ++++++++++++-
 3 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/[refs] b/[refs]
index fb08ee9a1515..a3bd33b37030 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 5deb45e39b946901ae028ccd3a1d0b35fa387475
+refs/heads/master: 8fb402bccf203ecca8f9e0202b8fd3c937dece6f
diff --git a/trunk/include/linux/prctl.h b/trunk/include/linux/prctl.h
index 3800639775ae..5c80b1939636 100644
--- a/trunk/include/linux/prctl.h
+++ b/trunk/include/linux/prctl.h
@@ -67,4 +67,10 @@
 #define PR_CAPBSET_READ 23
 #define PR_CAPBSET_DROP 24
 
+/* Get/set the process' ability to use the timestamp counter instruction */
+#define PR_GET_TSC 25
+#define PR_SET_TSC 26
+# define PR_TSC_ENABLE		1	/* allow the use of the timestamp counter */
+# define PR_TSC_SIGSEGV		2	/* throw a SIGSEGV instead of reading the TSC */
+
 #endif /* _LINUX_PRCTL_H */
diff --git a/trunk/kernel/sys.c b/trunk/kernel/sys.c
index a626116af5db..6a0cc71ee88d 100644
--- a/trunk/kernel/sys.c
+++ b/trunk/kernel/sys.c
@@ -67,6 +67,12 @@
 #ifndef SET_ENDIAN
 # define SET_ENDIAN(a,b)	(-EINVAL)
 #endif
+#ifndef GET_TSC_CTL
+# define GET_TSC_CTL(a)		(-EINVAL)
+#endif
+#ifndef SET_TSC_CTL
+# define SET_TSC_CTL(a)		(-EINVAL)
+#endif
 
 /*
  * this is where the system-wide overflow UID and GID are defined, for
@@ -1737,7 +1743,12 @@ asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3,
 #else
 			return -EINVAL;
 #endif
-
+		case PR_GET_TSC:
+			error = GET_TSC_CTL(arg2);
+			break;
+		case PR_SET_TSC:
+			error = SET_TSC_CTL(arg2);
+			break;
 		default:
 			error = -EINVAL;
 			break;