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Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:45300) by pandora.armlinux.org.uk with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lwLa1-0007U1-1E; Thu, 24 Jun 2021 10:23:25 +0100 Received: from linux by shell.armlinux.org.uk with local (Exim 4.92) (envelope-from ) id 1lwLZz-0005b3-V1; Thu, 24 Jun 2021 10:23:23 +0100 Date: Thu, 24 Jun 2021 10:23:23 +0100 From: "Russell King (Oracle)" To: Tang Bin Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] ARM: bL_switcher: use IS_ERR_OR_NULL() to simplify code Message-ID: <20210624092323.GP22278@shell.armlinux.org.uk> References: <20210624074223.11372-1-tangbin@cmss.chinamobile.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210624074223.11372-1-tangbin@cmss.chinamobile.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210624_022328_242691_6397A00C X-CRM114-Status: GOOD ( 13.70 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Jun 24, 2021 at 03:42:23PM +0800, Tang Bin wrote: > diff --git a/arch/arm/common/bL_switcher.c b/arch/arm/common/bL_switcher.c > index 9a9aa5354..b8e8e2567 100644 > --- a/arch/arm/common/bL_switcher.c > +++ b/arch/arm/common/bL_switcher.c > @@ -352,11 +352,9 @@ int bL_switch_request_cb(unsigned int cpu, unsigned int new_cluster_id, > > t = &bL_threads[cpu]; > > - if (IS_ERR(t->task)) > - return PTR_ERR(t->task); > - if (!t->task) > - return -ESRCH; > - > + if (IS_ERR_OR_NULL(t->task)) > + return t->task ? PTR_ERR(t->task) : -ESRCH; > + > spin_lock(&t->lock); > if (t->completer) { > spin_unlock(&t->lock); I don't think this improves the code. The original is more readable, and readability is what we care about rather than code compactness. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last! _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel