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Fri, 6 Mar 2020 23:56:01 +0000 Received: from unknown-38-66.xilinx.com ([149.199.38.66] helo=xsj-pvapsmtp01) by xsj-pvapsmtpgw01 with esmtp (Exim 4.63) (envelope-from ) id 1jAMoy-0003gm-MG; Fri, 06 Mar 2020 15:56:00 -0800 Received: from [127.0.0.1] (helo=localhost) by xsj-pvapsmtp01 with smtp (Exim 4.63) (envelope-from ) id 1jAMot-0004i4-In; Fri, 06 Mar 2020 15:55:55 -0800 Received: from xsj-pvapsmtp01 (smtp3.xilinx.com [149.199.38.66]) by xsj-smtp-dlp2.xlnx.xilinx.com (8.13.8/8.13.1) with ESMTP id 026NtkYS004488; Fri, 6 Mar 2020 15:55:46 -0800 Received: from [172.19.0.52] by xsj-pvapsmtp01 with esmtp (Exim 4.63) (envelope-from ) id 1jAMok-0004hI-LN; Fri, 06 Mar 2020 15:55:46 -0800 Subject: Re: [PATCH v2 1/4] firmware: xilinx: Add sysfs interface To: "'Greg KH'" , Jolly Shah References: <20200124060339.GB2906795@kroah.com> <2D4B924A-D10C-4A90-A8E6-507BF6C30654@xilinx.com> <20200128062814.GA2097606@kroah.com> <4EF659A1-2844-46B9-9ED6-5A6A20401D9D@xilinx.com> <20200131061038.GA2180358@kroah.com> <20200131093646.GA2271937@kroah.com> <3ef20e9d-052f-665c-7fc8-69a1f8bc9bd2@xilinx.com> <20200214171005.GB4034785@kroah.com> <20200215005235.GA32359@kroah.com> From: Jolly Shah Message-ID: <23a785fd-3874-b71a-c0f5-d117a9058abf@xilinx.com> Date: Fri, 6 Mar 2020 15:55:46 -0800 User-Agent: Mozilla/5.0 (Macintosh; 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charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Greg, > ------Original Message------ > From: 'Greg Kh' > Sent: Friday, February 14, 2020 4:52PM > To: Jolly Shah > Cc: Rajan Vaja , Ard.biesheuvel@linaro.org , Mingo@kernel.org , Matt@codeblueprint.co.uk , Sudeep.holla@arm.com , Hkallweit1@gmail.com , Keescook@chromium.org , Dmitry.torokhov@gmail.com , Michal Simek , Linux-arm-kernel@lists.infradead.org , Linux-kernel@vger.kernel.org > Subject: Re: [PATCH v2 1/4] firmware: xilinx: Add sysfs interface > > On Fri, Feb 14, 2020 at 04:37:16PM -0800, Jolly Shah wrote: >>> Just make the direct call to the firmware driver, no need to muck around >>> with tables of function pointers. In fact, with the spectre changes, >>> you just made things slower than needed, and you can get back a bunch of >>> throughput by removing that whole middle layer. >>> >> >> arm,scpi is doing the same way and we thought this approach will be more >> acceptable than direct function calls but happy to change as suggested. > > Just because one random tiny thing does it the wrong way does not mean > to focus on that design pattern and ignore the thousands of other > apis/interfaces in the kernel that do not do it that way :) > >>> So go do that first please, before adding any new stuff. >>> >>> Now for the ioctl, yeah, that's not a "normal" pattern either. But >>> right now you only have 2 "different" ioctls that you call. So why not >>> just turn those 2 into real function calls as well that then makes the >>> "ioctl" call to the hardware? That makes things a lot more obvious on >>> the kernel driver side exactly what is going on. >>> >> >> Sure as i understand firmware driver will provide real function calls to be >> used by user drivers and underneath it will call ioctl for desired >> operation. Please correct if I misunderstood. > > You do not misunderstand. Submitted v3 with required changes. Please review. Thanks, Jolly Shah > > thanks, > > greg k-h > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel