linux-kernel - [PATCH 1/4] check_unsafe_exec: use while_each_thread() rather than next

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Message-ID: <20131122175439.GA31446@redhat.com>
Date:	Fri, 22 Nov 2013 18:54:39 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Al Viro <viro@...IV.linux.org.uk>,
	Kees Cook <keescook@...omium.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Michal Hocko <mhocko@...e.cz>,
	Sameer Nanda <snanda@...omium.org>,
	Sergey Dyasly <dserrg@...il.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] check_unsafe_exec: use while_each_thread() rather than
	next_thread()

next_thread() should be avoided, change check_unsafe_exec()
to use while_each_thread(). This also saves 32 bytes.

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
---
 fs/exec.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/fs/exec.c b/fs/exec.c
index 1dee8ef..0cd9c25 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1245,10 +1245,11 @@ static int check_unsafe_exec(struct linux_binprm *bprm)
 	if (current->no_new_privs)
 		bprm->unsafe |= LSM_UNSAFE_NO_NEW_PRIVS;
 
+	t = p;
 	n_fs = 1;
 	spin_lock(&p->fs->lock);
 	rcu_read_lock();
-	for (t = next_thread(p); t != p; t = next_thread(t)) {
+	while_each_thread(p, t) {
 		if (t->fs == p->fs)
 			n_fs++;
 	}
-- 
1.5.5.1

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