lkml.org 
[lkml]   [2019]   [Oct]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v3 5/5] pid: use pid_has_task() in pidfd_open()
Date
Use the new pid_has_task() helper in pidfd_open(). This simplifies the
code and avoids taking rcu_read_{lock,unlock}() and leads to overall
nicer code.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
---
/* pidfd selftests */
passed

/* v1 */
patch not present

/* v2 */
Link: https://lore.kernel.org/r/20191016153606.2326-5-christian.brauner@ubuntu.com
patch introduced

/* v3 */
- Oleg Nesterov <oleg@redhat.com>:
- s/task_alive/pid_has_task/
---
kernel/pid.c | 12 +++++-------
1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/kernel/pid.c b/kernel/pid.c
index 124d40b239b1..7b5f6c963d72 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -497,7 +497,7 @@ static int pidfd_create(struct pid *pid)
*/
SYSCALL_DEFINE2(pidfd_open, pid_t, pid, unsigned int, flags)
{
- int fd, ret;
+ int fd;
struct pid *p;

if (flags)
@@ -510,13 +510,11 @@ SYSCALL_DEFINE2(pidfd_open, pid_t, pid, unsigned int, flags)
if (!p)
return -ESRCH;

- ret = 0;
- rcu_read_lock();
- if (!pid_task(p, PIDTYPE_TGID))
- ret = -EINVAL;
- rcu_read_unlock();
+ if (pid_has_task(p, PIDTYPE_TGID))
+ fd = pidfd_create(p);
+ else
+ fd = -EINVAL;

- fd = ret ?: pidfd_create(p);
put_pid(p);
return fd;
}
--
2.23.0
\
 
 \ /
  Last update: 2019-10-17 12:19    [W:0.109 / U:0.236 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site