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authorEric W. Biederman <ebiederm@xmission.com>2010-03-02 14:51:53 -0800
committerEric W. Biederman <ebiederm@xmission.com>2012-11-19 05:59:09 -0800
commit17cf22c33e1f1b5e435469c84e43872579497653 (patch)
treec5cec307c06f7e4ddc26e04e73c8833897b67113 /arch/um/drivers
parent49f4d8b93ccf9454284b6f524b96c66d8d7fbccc (diff)
pidns: Use task_active_pid_ns where appropriate
The expressions tsk->nsproxy->pid_ns and task_active_pid_ns aka ns_of_pid(task_pid(tsk)) should have the same number of cache line misses with the practical difference that ns_of_pid(task_pid(tsk)) is released later in a processes life. Furthermore by using task_active_pid_ns it becomes trivial to write an unshare implementation for the the pid namespace. So I have used task_active_pid_ns everywhere I can. In fork since the pid has not yet been attached to the process I use ns_of_pid, to achieve the same effect. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Diffstat (limited to 'arch/um/drivers')
-rw-r--r--arch/um/drivers/mconsole_kern.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/um/drivers/mconsole_kern.c b/arch/um/drivers/mconsole_kern.c
index 79ccfe6c7078..7fc71c628267 100644
--- a/arch/um/drivers/mconsole_kern.c
+++ b/arch/um/drivers/mconsole_kern.c
@@ -123,7 +123,7 @@ void mconsole_log(struct mc_request *req)
void mconsole_proc(struct mc_request *req)
{
- struct vfsmount *mnt = current->nsproxy->pid_ns->proc_mnt;
+ struct vfsmount *mnt = task_active_pid_ns(current)->proc_mnt;
char *buf;
int len;
struct file *file;