[test patch] seccomp: add code to disable TSC when enabling seccomp

[Chuck Ebbert <76306.1226@compuserve.com>]

Is the below patch acceptable in generic code, or should some arch
helper function hide it?  It lets i386 / x86_64 add TIF_NOTSC
independently.  

Also, what prevents this flag from being set on a running process?
If that happens the CPU state and flag could get out of sync and
this could cause problems because of the way the current code tests
the flag.

--- 2.6.18-rc1-nb.orig/fs/proc/base.c
+++ 2.6.18-rc1-nb/fs/proc/base.c
@@ -1025,6 +1025,9 @@ static ssize_t seccomp_write(struct file
 	if (seccomp_mode && seccomp_mode <= NR_SECCOMP_MODES) {
 		tsk->seccomp.mode = seccomp_mode;
 		set_tsk_thread_flag(tsk, TIF_SECCOMP);
+#ifdef TIF_NOTSC
+		set_tsk_thread_flag(tsk, TIF_NOTSC);
+#endif
 	} else
 		goto out;
 	result = -EIO;
-- 
Chuck
 "You can't read a newspaper if you can't read."  --George W. Bush
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/