[IA64] add missing syscall trace clear

The ptrace misses clearing the syscall trace flag.
The increased syscall overhead is retained after the trace is finished.
This case happens when strace is terminated by force.

Signed-off-by: Akiyama, Nobuyuki <akiyama.nobuyuk@jp.fujitsu.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

diff --git a/arch/ia64/kernel/ptrace.c b/arch/ia64/kernel/ptrace.c
index 3f8918782e0c992721a1758c1f83e2446f5261fe..00f80324694829f5eef2e647299a8227213689f1 100644 (file)
--- a/arch/ia64/kernel/ptrace.c
+++ b/arch/ia64/kernel/ptrace.c
@@ -1573,6 +1573,7 @@ sys_ptrace (long request, pid_t pid, unsigned long addr, unsigned long data)
 
              case PTRACE_DETACH:
                /* detach a process that was attached. */
+               clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
                ret = ptrace_detach(child, data);
                goto out_tsk;