From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 73FC1C43461 for ; Wed, 9 Sep 2020 21:14:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3862921D46 for ; Wed, 9 Sep 2020 21:14:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730064AbgIIVOJ (ORCPT ); Wed, 9 Sep 2020 17:14:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44312 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726414AbgIIVOG (ORCPT ); Wed, 9 Sep 2020 17:14:06 -0400 Received: from shards.monkeyblade.net (shards.monkeyblade.net [IPv6:2620:137:e000::1:9]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D4A31C061573; Wed, 9 Sep 2020 14:14:05 -0700 (PDT) Received: from localhost (unknown [IPv6:2601:601:9f00:477::3d5]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) (Authenticated sender: davem-davemloft) by shards.monkeyblade.net (Postfix) with ESMTPSA id B57B912987FAD; Wed, 9 Sep 2020 13:57:16 -0700 (PDT) Date: Wed, 09 Sep 2020 14:14:02 -0700 (PDT) Message-Id: <20200909.141402.826324173736678429.davem@davemloft.net> To: elder@linaro.org Cc: kuba@kernel.org, evgreen@chromium.org, subashab@codeaurora.org, cpratapa@codeaurora.org, bjorn.andersson@linaro.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH net-next 1/5] net: ipa: use atomic exchange for suspend reference From: David Miller In-Reply-To: References: <20200909002127.21089-2-elder@linaro.org> <20200908.202731.923992684489468023.davem@davemloft.net> X-Mailer: Mew version 6.8 on Emacs 27.1 Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.5.12 (shards.monkeyblade.net [2620:137:e000::1:9]); Wed, 09 Sep 2020 13:57:17 -0700 (PDT) Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Alex Elder Date: Wed, 9 Sep 2020 08:43:44 -0500 > There is exactly one reference here; the "reference" is > essentially a Boolean flag. So the value is always either > 0 or 1. Aha, then why not use a bitmask and test_and_set_bit() et al.?