From patchwork Tue Nov 17 18:43:49 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paolo Abeni X-Patchwork-Id: 11913239 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C09C7A6A for ; Tue, 17 Nov 2020 18:44:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 90F13223C7 for ; Tue, 17 Nov 2020 18:44:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="W1DAMZl8" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726719AbgKQSoK (ORCPT ); Tue, 17 Nov 2020 13:44:10 -0500 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:35902 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726579AbgKQSoJ (ORCPT ); Tue, 17 Nov 2020 13:44:09 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1605638642; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=lGq5kCPtIOhdBf9qopiL98GXQjU4TKit31m1KspptsU=; b=W1DAMZl88/57lDQ1+SpmOghF4CD3tKcpRY58qD3cuscZO1o2TCT0P5kyMyAsT20cQ8Hm+n ZQwpJP9wJT5nFXdWrsb0048ok5xZLD1Ny99U9mgFTfDd+zQUc/fjvLrewi1lJwbxkt6M70 vBAxRmiBnNC6ODo4cZ74WhPNeD19oEs= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-536-0GER-hQxMxS8KxvHiffQZQ-1; Tue, 17 Nov 2020 13:43:58 -0500 X-MC-Unique: 0GER-hQxMxS8KxvHiffQZQ-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 361421009443; Tue, 17 Nov 2020 18:43:57 +0000 (UTC) Received: from gerbillo.redhat.com (ovpn-112-19.ams2.redhat.com [10.36.112.19]) by smtp.corp.redhat.com (Postfix) with ESMTP id 778B15D9E8; Tue, 17 Nov 2020 18:43:55 +0000 (UTC) From: Paolo Abeni To: netdev@vger.kernel.org Cc: Jakub Kicinski , Eric Dumazet , Luc Van Oostenryck , linux-sparse@vger.kernel.org Subject: [PATCH net-next v2] net: add annotation for sock_{lock,unlock}_fast Date: Tue, 17 Nov 2020 19:43:49 +0100 Message-Id: <6ed7ae627d8271fb7f20e0a9c6750fbba1ac2635.1605634911.git.pabeni@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Precedence: bulk List-ID: X-Mailing-List: linux-sparse@vger.kernel.org The static checker is fooled by the non-static locking scheme implemented by the mentioned helpers. Let's make its life easier adding some unconditional annotation so that the helpers are now interpreted as a plain spinlock from sparse. v1 -> v2: - add __releases() annotation to unlock_sock_fast() Signed-off-by: Paolo Abeni --- include/net/sock.h | 10 +++++++--- net/core/sock.c | 3 ++- 2 files changed, 9 insertions(+), 4 deletions(-) diff --git a/include/net/sock.h b/include/net/sock.h index 1d29aeae74fd..093b51719c69 100644 --- a/include/net/sock.h +++ b/include/net/sock.h @@ -1595,7 +1595,8 @@ void release_sock(struct sock *sk); SINGLE_DEPTH_NESTING) #define bh_unlock_sock(__sk) spin_unlock(&((__sk)->sk_lock.slock)) -bool lock_sock_fast(struct sock *sk); +bool lock_sock_fast(struct sock *sk) __acquires(&sk->sk_lock.slock); + /** * unlock_sock_fast - complement of lock_sock_fast * @sk: socket @@ -1605,11 +1606,14 @@ bool lock_sock_fast(struct sock *sk); * If slow mode is on, we call regular release_sock() */ static inline void unlock_sock_fast(struct sock *sk, bool slow) + __releases(&sk->sk_lock.slock) { - if (slow) + if (slow) { release_sock(sk); - else + __release(&sk->sk_lock.slock); + } else { spin_unlock_bh(&sk->sk_lock.slock); + } } /* Used by processes to "lock" a socket state, so that diff --git a/net/core/sock.c b/net/core/sock.c index 727ea1cc633c..9badbe7bb4e4 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -3078,7 +3078,7 @@ EXPORT_SYMBOL(release_sock); * * sk_lock.slock unlocked, owned = 1, BH enabled */ -bool lock_sock_fast(struct sock *sk) +bool lock_sock_fast(struct sock *sk) __acquires(&sk->sk_lock.slock) { might_sleep(); spin_lock_bh(&sk->sk_lock.slock); @@ -3096,6 +3096,7 @@ bool lock_sock_fast(struct sock *sk) * The sk_lock has mutex_lock() semantics here: */ mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_); + __acquire(&sk->sk_lock.slock); local_bh_enable(); return true; }