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Date:   Wed, 10 Feb 2021 14:15:56 +0100
From:   Florian Westphal <fw@strlen.de>
To:     Alexander Lobakin <alobakin@pm.me>
Cc:     "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Jonathan Lemon <jonathan.lemon@gmail.com>,
        Eric Dumazet <edumazet@google.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        Willem de Bruijn <willemb@google.com>,
        Randy Dunlap <rdunlap@infradead.org>,
        Kevin Hao <haokexin@gmail.com>,
        Pablo Neira Ayuso <pablo@netfilter.org>,
        Jakub Sitnicki <jakub@cloudflare.com>,
        Marco Elver <elver@google.com>,
        Dexuan Cui <decui@microsoft.com>,
        Paolo Abeni <pabeni@redhat.com>,
        Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Andrii Nakryiko <andriin@fb.com>,
        Taehee Yoo <ap420073@gmail.com>,
        Cong Wang <xiyou.wangcong@gmail.com>,
        =?iso-8859-15?Q?Bj=F6rn_T=F6pel?= <bjorn@kernel.org>,
        Miaohe Lin <linmiaohe@huawei.com>,
        Guillaume Nault <gnault@redhat.com>,
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        Michal Kubecek <mkubecek@suse.cz>,
        Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>,
        Dmitry Safonov <0x7f454c46@gmail.com>,
        Yang Yingliang <yangyingliang@huawei.com>,
        linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
        Edward Cree <ecree.xilinx@gmail.com>
Subject: Re: [v3 net-next 08/10] skbuff: reuse NAPI skb cache on allocation
 path (__build_skb())
Message-ID: <20210210131556.GA2766@breakpoint.cc>
References: <20210209204533.327360-1-alobakin@pm.me>
 <20210209204533.327360-9-alobakin@pm.me>
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Alexander Lobakin <alobakin@pm.me> wrote:
> we're in such context. This includes: build_skb() (called only
> from NIC drivers in NAPI Rx context) and {,__}napi_alloc_skb()
> (called from the same place or from kernel network softirq
> functions).

build_skb is called from sleepable context in drivers/net/tun.c .
Perhaps there are other cases.