A-Team_Digital_Solutions/android_kernel_motorola_sm6375
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coallocate socket_wq with socket itself

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socket->wq is assign-once, set when we are initializing both
struct socket it's in and struct socket_wq it points to.  As the
matter of fact, the only reason for separate allocation was the
ability to RCU-delay freeing of socket_wq.  RCU-delaying the
freeing of socket itself gets rid of that need, so we can just
fold struct socket_wq into the end of struct socket and simplify
the life both for sock_alloc_inode() (one allocation instead of
two) and for tun/tap oddballs, where we used to embed struct socket
and struct socket_wq into the same structure (now - embedding just
the struct socket).

Note that reference to struct socket_wq in struct sock does remain
a reference - that's unchanged.

Signed-off-by: Al Viro <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Al Viro 2019-07-05 20:14:16 +01:00 • committed by David S. Miller
commit 333f7909a8
7 changed files with 15 additions and 28 deletions
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4
include/net/sock.h
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@ -1822,7 +1822,7 @@ static inline void sock_graft(struct sock *sk, struct socket *parent)
{
WARN_ON(parent->sk);
write_lock_bh(&sk->sk_callback_lock);
rcu_assign_pointer(sk->sk_wq, parent->wq);
rcu_assign_pointer(sk->sk_wq, &parent->wq);
parent->sk = sk;
sk_set_socket(sk, parent);
sk->sk_uid = SOCK_INODE(parent)->i_uid;
@ -2100,7 +2100,7 @@ static inline void sock_poll_wait(struct file *filp, struct socket *sock,
poll_table *p)
{
if (!poll_does_not_wait(p)) {
poll_wait(filp, &sock->wq->wait, p);
poll_wait(filp, &sock->wq.wait, p);
/* We need to be sure we are in sync with the
* socket flags modification.
*