From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753868AbaIRIEy (ORCPT ); Thu, 18 Sep 2014 04:04:54 -0400 Received: from [119.145.14.65] ([119.145.14.65]:54727 "EHLO szxga02-in.huawei.com" rhost-flags-FAIL-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751595AbaIRIEv (ORCPT ); Thu, 18 Sep 2014 04:04:51 -0400 Message-ID: <541A91D8.8070407@huawei.com> Date: Thu, 18 Sep 2014 16:03:36 +0800 From: Zefan Li User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20130801 Thunderbird/17.0.8 MIME-Version: 1.0 To: Tejun Heo CC: Cgroups , LKML Subject: [PATCH 2/2] cpuset: simplify proc_cpuset_show() References: <541A91C3.9000305@huawei.com> In-Reply-To: <541A91C3.9000305@huawei.com> Content-Type: text/plain; charset="GB2312" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.177.18.230] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Use the ONE macro instead of REG, and we can simplify proc_cpuset_show(). Signed-off-by: Zefan Li --- fs/proc/base.c | 20 ++------------------ include/linux/cpuset.h | 3 ++- kernel/cpuset.c | 15 +++------------ 3 files changed, 7 insertions(+), 31 deletions(-) diff --git a/fs/proc/base.c b/fs/proc/base.c index 6b96892..4e8aa35 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -376,22 +376,6 @@ static const struct file_operations proc_lstats_operations = { #endif -#ifdef CONFIG_PROC_PID_CPUSET - -static int cpuset_open(struct inode *inode, struct file *file) -{ - struct pid *pid = PROC_I(inode)->pid; - return single_open(file, proc_cpuset_show, pid); -} - -static const struct file_operations proc_cpuset_operations = { - .open = cpuset_open, - .read = seq_read, - .llseek = seq_lseek, - .release = single_release, -}; -#endif - static int proc_oom_score(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task) { @@ -2558,7 +2542,7 @@ static const struct pid_entry tgid_base_stuff[] = { REG("latency", S_IRUGO, proc_lstats_operations), #endif #ifdef CONFIG_PROC_PID_CPUSET - REG("cpuset", S_IRUGO, proc_cpuset_operations), + ONE("cpuset", S_IRUGO, proc_cpuset_show), #endif #ifdef CONFIG_CGROUPS ONE("cgroup", S_IRUGO, proc_cgroup_show), @@ -2904,7 +2888,7 @@ static const struct pid_entry tid_base_stuff[] = { REG("latency", S_IRUGO, proc_lstats_operations), #endif #ifdef CONFIG_PROC_PID_CPUSET - REG("cpuset", S_IRUGO, proc_cpuset_operations), + ONE("cpuset", S_IRUGO, proc_cpuset_show), #endif #ifdef CONFIG_CGROUPS ONE("cgroup", S_IRUGO, proc_cgroup_show), diff --git a/include/linux/cpuset.h b/include/linux/cpuset.h index ade2390..0d4e067 100644 --- a/include/linux/cpuset.h +++ b/include/linux/cpuset.h @@ -86,7 +86,8 @@ extern void __cpuset_memory_pressure_bump(void); extern void cpuset_task_status_allowed(struct seq_file *m, struct task_struct *task); -extern int proc_cpuset_show(struct seq_file *, void *); +extern int proc_cpuset_show(struct seq_file *m, struct pid_namespace *ns, + struct pid *pid, struct task_struct *tsk); extern int cpuset_mem_spread_node(void); extern int cpuset_slab_spread_node(void); diff --git a/kernel/cpuset.c b/kernel/cpuset.c index 22874d7..a37f4ed 100644 --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -2729,10 +2729,9 @@ void __cpuset_memory_pressure_bump(void) * and we take cpuset_mutex, keeping cpuset_attach() from changing it * anyway. */ -int proc_cpuset_show(struct seq_file *m, void *unused_v) +int proc_cpuset_show(struct seq_file *m, struct pid_namespace *ns, + struct pid *pid, struct task_struct *tsk) { - struct pid *pid; - struct task_struct *tsk; char *buf, *p; struct cgroup_subsys_state *css; int retval; @@ -2742,24 +2741,16 @@ int proc_cpuset_show(struct seq_file *m, void *unused_v) if (!buf) goto out; - retval = -ESRCH; - pid = m->private; - tsk = get_pid_task(pid, PIDTYPE_PID); - if (!tsk) - goto out_free; - retval = -ENAMETOOLONG; rcu_read_lock(); css = task_css(tsk, cpuset_cgrp_id); p = cgroup_path(css->cgroup, buf, PATH_MAX); rcu_read_unlock(); if (!p) - goto out_put_task; + goto out_free; seq_puts(m, p); seq_putc(m, '\n'); retval = 0; -out_put_task: - put_task_struct(tsk); out_free: kfree(buf); out: -- 1.8.0.2