linux-kernel - [RFC PATCH 2/12 v2] ptrace: tracehooks: do not use task->ptrace directly

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Message-ID: <20090528113540.GA18681@redhat.com>
Date:	Thu, 28 May 2009 13:35:40 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Roland McGrath <roland@...hat.com>
Cc:	Christoph Hellwig <hch@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH 2/12 v2] ptrace: tracehooks: do not use task->ptrace
	directly

s/->ptrace/task_ptrace()/ in tracehook.h as a preparation for the future
changes.

Also, microoptimize tracehook_prepare_clone() for the common non-ptraced
case.

 include/linux/tracehook.h |   16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

--- PTRACE/include/linux/tracehook.h~1_TRACEHOOK	2009-05-24 21:36:47.000000000 +0200
+++ PTRACE/include/linux/tracehook.h	2009-05-24 21:48:40.000000000 +0200
@@ -225,16 +225,18 @@ static inline void tracehook_report_exit
  */
 static inline int tracehook_prepare_clone(unsigned clone_flags)
 {
-	if (clone_flags & CLONE_UNTRACED)
+	unsigned int ptrace = task_ptrace(current);
+
+	if (likely(!ptrace) || (clone_flags & CLONE_UNTRACED))
 		return 0;
 
 	if (clone_flags & CLONE_VFORK) {
-		if (current->ptrace & PT_TRACE_VFORK)
+		if (ptrace & PT_TRACE_VFORK)
 			return PTRACE_EVENT_VFORK;
 	} else if ((clone_flags & CSIGNAL) != SIGCHLD) {
-		if (current->ptrace & PT_TRACE_CLONE)
+		if (ptrace & PT_TRACE_CLONE)
 			return PTRACE_EVENT_CLONE;
-	} else if (current->ptrace & PT_TRACE_FORK)
+	} else if (ptrace & PT_TRACE_FORK)
 		return PTRACE_EVENT_FORK;
 
 	return 0;
@@ -479,7 +481,7 @@ static inline int tracehook_get_signal(s
  */
 static inline int tracehook_notify_jctl(int notify, int why)
 {
-	return notify || (current->ptrace & PT_PTRACED);
+	return notify || task_ptrace(current);
 }
 
 #define DEATH_REAP			-1
@@ -503,7 +505,7 @@ static inline int tracehook_notify_death
 					 void **death_cookie, int group_dead)
 {
 	if (task_detached(task))
-		return task->ptrace ? SIGCHLD : DEATH_REAP;
+		return task_ptrace(task) ? SIGCHLD : DEATH_REAP;
 
 	/*
 	 * If something other than our normal parent is ptracing us, then
@@ -513,7 +515,7 @@ static inline int tracehook_notify_death
 	if (thread_group_empty(task) && !ptrace_reparented(task))
 		return task->exit_signal;
 
-	return task->ptrace ? SIGCHLD : DEATH_DELAYED_GROUP_LEADER;
+	return task_ptrace(task) ? SIGCHLD : DEATH_DELAYED_GROUP_LEADER;
 }
 
 /**

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