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authorErik Bosman <ebn310@few.vu.nl>2008-04-11 18:54:17 +0200
committerIngo Molnar <mingo@elte.hu>2008-04-19 19:19:55 +0200
commit8fb402bccf203ecca8f9e0202b8fd3c937dece6f (patch)
tree4f102f9cc81dedbf9271f728a4b1e6e731a6a174 /kernel
parent5deb45e39b946901ae028ccd3a1d0b35fa387475 (diff)
downloadop-kernel-dev-8fb402bccf203ecca8f9e0202b8fd3c937dece6f.zip
op-kernel-dev-8fb402bccf203ecca8f9e0202b8fd3c937dece6f.tar.gz
generic, x86: add prctl commands PR_GET_TSC and PR_SET_TSC
This patch adds prctl commands that make it possible to deny the execution of timestamp counters in userspace. If this is not implemented on a specific architecture, prctl will return -EINVAL. ned-off-by: Erik Bosman <ejbosman@cs.vu.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sys.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/kernel/sys.c b/kernel/sys.c
index a626116..6a0cc71 100644
--- a/kernel/sys.c
+++ b/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;
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