From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AG47ELtCNZIeb1hg4em0LkIqmhu4PAFHCIoAILor0OPfw7SPsjO6lh/Zl8pU4JV7iFPc0Tkebd3A ARC-Seal: i=1; a=rsa-sha256; t=1522096400; cv=none; d=google.com; s=arc-20160816; b=QPsXrZrOTkg/Caty3wjKGrRmSWOBsnpZ4GUc3bmiaB5g/wGa8UvX/PXkYhw6wpgUN+ nJui/81rTjxZ8mcg4z/MQ6bR5b5qGkt1gZqxdYodhDzQAQhJvzN7aZpGnPnLDRfhhXmz ATVlc9V5f/u++Uny75kDwWTJJWl/GlQL6UcESXv9fxCsJlIsWeZyb206aqtUp9ZhEaZ/ xIesvg/dUyQlNAi9lvAUUQluKG/bYhBbrbTj7MgO4l5YDJFHmCV2F6z7LSrDQpjLC6fL bdEtwXTa2AxaXDQG+rjpBGJbE1fPZYdG0gdJA6z1Y8MGK07EcUX21bmT2AYhPspvN2co kkxA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=subject:content-transfer-encoding:content-language:in-reply-to :mime-version:user-agent:date:message-id:from:references:cc:to :arc-authentication-results; bh=R5KU4EDu+c/hSFqgGsYuHGUiMQ2wubcaxjTV6hiHypw=; b=PlFkBwyVbt4o+2iUJSH+4AKYTF9xKzTlTSL6cHJeR7Q8JyKyA2p4loaAji038O6pHA aplLyXUkNhdRWaqoMLaCvH4WYI1qjEsOfQxJh57k5ZhVJ9vzB4DMGR89RBqnAkDIHrDy 5gEHPDtXUIJ9ZN0618ogRw5gqfWQqYD4G3S2PK7H1vV6c+rU7M37NrhtZ6XVMCQJ2Ljy +WJRBzkQS0de1qIMG+0GoU6/Q1uU9lLmXJ7KqC/9awkQ2gmx4CpYlx6ycS5QIdiM8yx5 qq4O3KUHq5m+ZuaqmOsnymUElOCTqgl6WwF3gio1Cs995oJB8JPqFv/LbSUMRTjRYqtP iWHg== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of logang@deltatee.com designates 207.54.116.67 as permitted sender) smtp.mailfrom=logang@deltatee.com Authentication-Results: mx.google.com; spf=pass (google.com: domain of logang@deltatee.com designates 207.54.116.67 as permitted sender) smtp.mailfrom=logang@deltatee.com To: Arnd Bergmann Cc: Linux Kernel Mailing List , linux-arch , linux-ntb@googlegroups.com, "open list:HARDWARE RANDOM NUMBER GENERATOR CORE" , Greg Kroah-Hartman , Andy Shevchenko , =?UTF-8?Q?Horia_Geant=c4=83?= , Philippe Ombredanne , Thomas Gleixner , Kate Stewart , Luc Van Oostenryck References: <20180321163745.12286-1-logang@deltatee.com> <20180321163745.12286-2-logang@deltatee.com> <726eb143-2cca-b221-b569-e193a962e357@deltatee.com> From: Logan Gunthorpe Message-ID: <6a063b65-668a-ef9c-696e-8c378e6b2640@deltatee.com> Date: Mon, 26 Mar 2018 14:33:13 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-SA-Exim-Connect-IP: 172.16.1.162 X-SA-Exim-Rcpt-To: luc.vanoostenryck@gmail.com, kstewart@linuxfoundation.org, tglx@linutronix.de, pombredanne@nexb.com, horia.geanta@nxp.com, andy.shevchenko@gmail.com, gregkh@linuxfoundation.org, linux-crypto@vger.kernel.org, linux-ntb@googlegroups.com, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, arnd@arndb.de X-SA-Exim-Mail-From: logang@deltatee.com Subject: Re: [PATCH v13 01/10] iomap: Use correct endian conversion function in mmio_writeXXbe X-SA-Exim-Version: 4.2.1 (built Tue, 02 Aug 2016 21:08:31 +0000) X-SA-Exim-Scanned: Yes (on ale.deltatee.com) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1595565968042571455?= X-GMAIL-MSGID: =?utf-8?q?1596033755493695230?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On 26/03/18 01:50 PM, Arnd Bergmann wrote: > I wouldn't expect it to matter: the byte swap is almost always much > cheaper compared to the actual bus access for the MMIO, and I > would also guess that modern compilers can eliminate the double > byte swap on architectures where writel() is an inline function. Most of > the important architectures use ARCH_USE_BUILTIN_BSWAP, which > guarantees that. Fair enough. Sometime this week I'll update my patch set to change that. Thanks, Logan