Hi,
On 2020/12/1 16:53, Greg Kroah-Hartman wrote:
From: Jens Axboe axboe@kernel.dk
[ Upstream commit 8d4c3e76e3be11a64df95ddee52e99092d42fc19 ]
If this is attempted by a kthread, then return -EOPNOTSUPP as we don't currently support that. Once we can get task_pid_ptr() doing the right thing, then this can go away again.
https://www.spinics.net/lists/io-uring/msg05297.html
This patch seems used for io-wq worker which is merged in
v5.5-rc1, why we need this in linux-4.19.y ?
Thanks,
Yang
Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Sasha Levin sashal@kernel.org
fs/proc/self.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/fs/proc/self.c b/fs/proc/self.c index cc6d4253399d1..7922edf70ce1a 100644 --- a/fs/proc/self.c +++ b/fs/proc/self.c @@ -16,6 +16,13 @@ static const char *proc_self_get_link(struct dentry *dentry, pid_t tgid = task_tgid_nr_ns(current, ns); char *name;
- /*
* Not currently supported. Once we can inherit all of struct pid,* we can allow this.*/- if (current->flags & PF_KTHREAD)
return ERR_PTR(-EOPNOTSUPP);- if (!tgid) return ERR_PTR(-ENOENT); /* max length of unsigned int in decimal + NULL term */