From: Akiyama, Nobuyuki <akiyama.nobuyuk@jp.fujitsu.com>
Date: Thu, 22 Feb 2007 13:50:38 +0000 (+0900)
Subject: [IA64] add missing syscall trace clear
X-Git-Tag: v2.6.21-rc4~51^2~3
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8e43d75ad0bd8a90933abb005ef57caf63ce8541;p=linux-2.6

[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 3f8918782e..00f8032469 100644
--- 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;