From 8f0ee97e63fe648d9e5dabafccc83e1a5921813e Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 21 Sep 2011 19:57:12 +0200
Subject: [PATCH 178/327] signal: Revert ptrace preempt magic

Upstream commit '53da1d9456fe7f8 fix ptrace slowness' is nothing more
than a bandaid around the ptrace design trainwreck. It's not a
correctness issue, it's merily a cosmetic bandaid.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 kernel/signal.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/kernel/signal.c b/kernel/signal.c
index 7a9af6d4f2b0..0163f089c08d 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2196,16 +2196,8 @@ static void ptrace_stop(int exit_code, int why, int clear_code, kernel_siginfo_t
 		if (gstop_done && ptrace_reparented(current))
 			do_notify_parent_cldstop(current, false, why);
 
-		/*
-		 * Don't want to allow preemption here, because
-		 * sys_ptrace() needs this task to be inactive.
-		 *
-		 * XXX: implement read_unlock_no_resched().
-		 */
-		preempt_disable();
 		read_unlock(&tasklist_lock);
 		cgroup_enter_frozen();
-		preempt_enable_no_resched();
 		freezable_schedule();
 		cgroup_leave_frozen(true);
 	} else {
-- 
2.49.0

