netdev - Re: [PATCH 08/14] net: tcp_memcontrol: sanitize tcp memory accounting callbacks

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Date:	Thu, 12 Nov 2015 20:53:38 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	David Miller <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Vladimir Davydov <vdavydov@...tuozzo.com>,
	Tejun Heo <tj@...nel.org>, Michal Hocko <mhocko@...e.cz>,
	netdev@...r.kernel.org, linux-mm@...ck.org,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-team@...com
Subject: Re: [PATCH 08/14] net: tcp_memcontrol: sanitize tcp memory
 accounting callbacks

On Thu, 2015-11-12 at 18:41 -0500, Johannes Weiner wrote:


> @@ -711,6 +705,12 @@ static inline void mem_cgroup_wb_stats(struct bdi_writeback *wb,
>  struct sock;
>  void sock_update_memcg(struct sock *sk);
>  void sock_release_memcg(struct sock *sk);
> +bool mem_cgroup_charge_skmem(struct cg_proto *proto, unsigned int nr_pages);
> +void mem_cgroup_uncharge_skmem(struct cg_proto *proto, unsigned int nr_pages);
> +static inline bool mem_cgroup_under_socket_pressure(struct cg_proto *proto)
> +{
> +	return proto->memory_pressure;
> +}
>  #endif /* CONFIG_INET && CONFIG_MEMCG_KMEM */
>  
>  #ifdef CONFIG_MEMCG_KMEM
> diff --git a/include/net/sock.h b/include/net/sock.h
> index 2eefc99..8cc7613 100644
> --- a/include/net/sock.h
> +++ b/include/net/sock.h
> @@ -1126,8 +1126,8 @@ static inline bool sk_under_memory_pressure(const struct sock *sk)
>  	if (!sk->sk_prot->memory_pressure)
>  		return false;
>  
> -	if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
> -		return !!sk->sk_cgrp->memory_pressure;
> +	if (mem_cgroup_sockets_enabled && sk->sk_cgrp &&
> +	    mem_cgroup_under_socket_pressure(sk->sk_cgrp))
>  
>  	return !!*sk->sk_prot->memory_pressure;
>  }


This looks wrong ?

if (A && B && C)
    return !!*sk->sk_prot->memory_pressure;

<compiler should eventually barf, 
as this function should not return void>
}







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