linux-kernel - [PATCH 4/5] Use wait_copyout() in wait_task

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Message-Id: <1242036759-4025-5-git-send-email-v.mayatskih@gmail.com>
Date:	Mon, 11 May 2009 12:12:43 +0200
From:	Vitaly Mayatskikh <v.mayatskih@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Oleg Nesterov <oleg@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Roland McGrath <roland@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 4/5] Use wait_copyout() in wait_task_zombie()

All copy-paste getrusage() and put_user() code in wait_task_* functions
is replaced by call to wait_copyout()

Signed-off-by: Vitaly Mayatskikh <v.mayatskih@...il.com>
---
 kernel/exit.c |   39 +++++++++++----------------------------
 1 files changed, 11 insertions(+), 28 deletions(-)

diff --git a/kernel/exit.c b/kernel/exit.c
index 6ee6b53..1ff490d 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1165,17 +1165,15 @@ static int wait_noreap_copyout(struct wait_opts *wo, struct task_struct *p,
 static int wait_task_zombie(struct wait_opts *wo, struct task_struct *p)
 {
 	unsigned long state;
-	int retval, status, traced;
+	int retval, why, status, traced;
 	pid_t pid = task_pid_vnr(p);
 	uid_t uid = __task_cred(p)->uid;
-	struct siginfo __user *infop;
 
 	if (!likely(wo->wo_flags & WEXITED))
 		return 0;
 
 	if (unlikely(wo->wo_flags & WNOWAIT)) {
 		int exit_code = p->exit_code;
-		int why, status;
 
 		get_task_struct(p);
 		read_unlock(&tasklist_lock);
@@ -1267,36 +1265,21 @@ static int wait_task_zombie(struct wait_opts *wo, struct task_struct *p)
 	 */
 	read_unlock(&tasklist_lock);
 
-	retval = wo->wo_rusage
-		? getrusage(p, RUSAGE_BOTH, wo->wo_rusage) : 0;
 	status = (p->signal->flags & SIGNAL_GROUP_EXIT)
 		? p->signal->group_exit_code : p->exit_code;
-	if (!retval && wo->wo_stat)
+	if (wo->wo_stat)
 		retval = put_user(status, wo->wo_stat);
 
-	infop = wo->wo_info;
-	if (!retval && infop)
-		retval = put_user(SIGCHLD, &infop->si_signo);
-	if (!retval && infop)
-		retval = put_user(0, &infop->si_errno);
-	if (!retval && infop) {
-		int why;
-
-		if ((status & 0x7f) == 0) {
-			why = CLD_EXITED;
-			status >>= 8;
-		} else {
-			why = (status & 0x80) ? CLD_DUMPED : CLD_KILLED;
-			status &= 0x7f;
-		}
-		retval = put_user((short)why, &infop->si_code);
-		if (!retval)
-			retval = put_user(status, &infop->si_status);
+	if ((status & 0x7f) == 0) {
+		why = CLD_EXITED;
+		status >>= 8;
+	} else {
+		why = (status & 0x80) ? CLD_DUMPED : CLD_KILLED;
+		status &= 0x7f;
 	}
-	if (!retval && infop)
-		retval = put_user(pid, &infop->si_pid);
-	if (!retval && infop)
-		retval = put_user(uid, &infop->si_uid);
+
+	retval = wait_copyout(wo, p, pid, uid, why, status, SIGCHLD);
+
 	if (!retval)
 		retval = pid;
 
-- 
1.6.2.2


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