From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Lezcano Subject: Re: [PATCH 1/9] ARM: get rid of arch_cpu_idle_prepare() Date: Mon, 27 Jan 2014 18:30:46 +0100 Message-ID: <52E697C6.10809@linaro.org> References: <1390802904-28399-1-git-send-email-nicolas.pitre@linaro.org> <1390802904-28399-2-git-send-email-nicolas.pitre@linaro.org> <52E6175F.1050401@linaro.org> <20140127160736.GP15937@n2100.arm.linux.org.uk> <52E69395.9020004@linaro.org> <20140127172110.GR15937@n2100.arm.linux.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <20140127172110.GR15937@n2100.arm.linux.org.uk> Sender: linux-kernel-owner@vger.kernel.org To: Russell King - ARM Linux Cc: Nicolas Pitre , Catalin Marinas , Benjamin Herrenschmidt , Paul Mundt , Thomas Gleixner , Ingo Molnar , Peter Zijlstra , "Rafael J. Wysocki" , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-sh@vger.kernel.org, linux-pm@vger.kernel.org, linaro-kernel@lists.linaro.org List-Id: linux-pm@vger.kernel.org On 01/27/2014 06:21 PM, Russell King - ARM Linux wrote: > On Mon, Jan 27, 2014 at 06:12:53PM +0100, Daniel Lezcano wrote: >> On 01/27/2014 05:07 PM, Russell King - ARM Linux wrote: >>> On Mon, Jan 27, 2014 at 09:22:55AM +0100, Daniel Lezcano wrote: >>>> On 01/27/2014 07:08 AM, Nicolas Pitre wrote: >>>>> ARM and ARM64 are the only two architectures implementing >>>>> arch_cpu_idle_prepare() simply to call local_fiq_enable(). >>>>> >>>>> We have secondary_start_kernel() already calling local_fiq_enable= () and >>>>> this is done a second time in arch_cpu_idle_prepare() in that cas= e. And >>>>> enabling FIQs has nothing to do with idling the CPU to start with= =2E >>>>> >>>>> So let's introduce init_fiq_boot_cpu() to take care of FIQs on th= e boot >>>>> CPU and remove arch_cpu_idle_prepare(). This is now done a bit ea= rlier >>>>> at late_initcall time but this shouldn't make a difference in pra= ctice >>>>> i.e. when FIQs are actually used. >>>>> >>>>> Signed-off-by: Nicolas Pitre >>>> >>>> Reviewed-by: Daniel Lezcano >>> >>> What kind of review did you do when giving that attributation? >> >> I did the review to the best of my knowledge and with good will. >> >> I read your comment on this patch and I learnt one more thing. >> >> Today, I am smarter than yesterday and dumber than tomorrow :) > > Just be aware that putting a comment along with the reviewed-by tag > is always a good idea. I know that's a little more work, but this ha= s > been raised a number of times by various people over the years. > > A reviewed-by tag on its own doesn't mean much, as it could mean that > you've just glanced over the code and decided "yea, it looks okay", o= r > it could mean that you've spent all day verifying that the code chang= e > is indeed correct. > > Consequently, some will ignore emails which just contain a reviewed-b= y > attributation. Thanks for the clarification. I will take care of giving a comment next= =20 time. -- Daniel --=20 Linaro.org =E2=94=82 Open source software fo= r ARM SoCs =46ollow Linaro: Facebook | Twitter | Blog From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Lezcano Date: Mon, 27 Jan 2014 17:30:46 +0000 Subject: Re: [PATCH 1/9] ARM: get rid of arch_cpu_idle_prepare() Message-Id: <52E697C6.10809@linaro.org> List-Id: References: <1390802904-28399-1-git-send-email-nicolas.pitre@linaro.org> <1390802904-28399-2-git-send-email-nicolas.pitre@linaro.org> <52E6175F.1050401@linaro.org> <20140127160736.GP15937@n2100.arm.linux.org.uk> <52E69395.9020004@linaro.org> <20140127172110.GR15937@n2100.arm.linux.org.uk> In-Reply-To: <20140127172110.GR15937@n2100.arm.linux.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: quoted-printable To: linux-arm-kernel@lists.infradead.org On 01/27/2014 06:21 PM, Russell King - ARM Linux wrote: > On Mon, Jan 27, 2014 at 06:12:53PM +0100, Daniel Lezcano wrote: >> On 01/27/2014 05:07 PM, Russell King - ARM Linux wrote: >>> On Mon, Jan 27, 2014 at 09:22:55AM +0100, Daniel Lezcano wrote: >>>> On 01/27/2014 07:08 AM, Nicolas Pitre wrote: >>>>> ARM and ARM64 are the only two architectures implementing >>>>> arch_cpu_idle_prepare() simply to call local_fiq_enable(). >>>>> >>>>> We have secondary_start_kernel() already calling local_fiq_enable() a= nd >>>>> this is done a second time in arch_cpu_idle_prepare() in that case. A= nd >>>>> enabling FIQs has nothing to do with idling the CPU to start with. >>>>> >>>>> So let's introduce init_fiq_boot_cpu() to take care of FIQs on the bo= ot >>>>> CPU and remove arch_cpu_idle_prepare(). This is now done a bit earlier >>>>> at late_initcall time but this shouldn't make a difference in practice >>>>> i.e. when FIQs are actually used. >>>>> >>>>> Signed-off-by: Nicolas Pitre >>>> >>>> Reviewed-by: Daniel Lezcano >>> >>> What kind of review did you do when giving that attributation? >> >> I did the review to the best of my knowledge and with good will. >> >> I read your comment on this patch and I learnt one more thing. >> >> Today, I am smarter than yesterday and dumber than tomorrow :) > > Just be aware that putting a comment along with the reviewed-by tag > is always a good idea. I know that's a little more work, but this has > been raised a number of times by various people over the years. > > A reviewed-by tag on its own doesn't mean much, as it could mean that > you've just glanced over the code and decided "yea, it looks okay", or > it could mean that you've spent all day verifying that the code change > is indeed correct. > > Consequently, some will ignore emails which just contain a reviewed-by > attributation. Thanks for the clarification. I will take care of giving a comment next=20 time. -- Daniel --=20 Linaro.org =E2=94=82 Open source software for AR= M SoCs Follow Linaro: Facebook | Twitter | Blog From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wg0-f43.google.com (mail-wg0-f43.google.com [74.125.82.43]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id B97682C00A2 for ; Tue, 28 Jan 2014 04:30:50 +1100 (EST) Received: by mail-wg0-f43.google.com with SMTP id y10so5958280wgg.22 for ; Mon, 27 Jan 2014 09:30:45 -0800 (PST) Message-ID: <52E697C6.10809@linaro.org> Date: Mon, 27 Jan 2014 18:30:46 +0100 From: Daniel Lezcano MIME-Version: 1.0 To: Russell King - ARM Linux Subject: Re: [PATCH 1/9] ARM: get rid of arch_cpu_idle_prepare() References: <1390802904-28399-1-git-send-email-nicolas.pitre@linaro.org> <1390802904-28399-2-git-send-email-nicolas.pitre@linaro.org> <52E6175F.1050401@linaro.org> <20140127160736.GP15937@n2100.arm.linux.org.uk> <52E69395.9020004@linaro.org> <20140127172110.GR15937@n2100.arm.linux.org.uk> In-Reply-To: <20140127172110.GR15937@n2100.arm.linux.org.uk> Content-Type: text/plain; charset=UTF-8; format=flowed Cc: Nicolas Pitre , linaro-kernel@lists.linaro.org, linux-sh@vger.kernel.org, Peter Zijlstra , Catalin Marinas , linux-pm@vger.kernel.org, "Rafael J. Wysocki" , linux-kernel@vger.kernel.org, Paul Mundt , Thomas Gleixner , linuxppc-dev@lists.ozlabs.org, Ingo Molnar , linux-arm-kernel@lists.infradead.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On 01/27/2014 06:21 PM, Russell King - ARM Linux wrote: > On Mon, Jan 27, 2014 at 06:12:53PM +0100, Daniel Lezcano wrote: >> On 01/27/2014 05:07 PM, Russell King - ARM Linux wrote: >>> On Mon, Jan 27, 2014 at 09:22:55AM +0100, Daniel Lezcano wrote: >>>> On 01/27/2014 07:08 AM, Nicolas Pitre wrote: >>>>> ARM and ARM64 are the only two architectures implementing >>>>> arch_cpu_idle_prepare() simply to call local_fiq_enable(). >>>>> >>>>> We have secondary_start_kernel() already calling local_fiq_enable() and >>>>> this is done a second time in arch_cpu_idle_prepare() in that case. And >>>>> enabling FIQs has nothing to do with idling the CPU to start with. >>>>> >>>>> So let's introduce init_fiq_boot_cpu() to take care of FIQs on the boot >>>>> CPU and remove arch_cpu_idle_prepare(). This is now done a bit earlier >>>>> at late_initcall time but this shouldn't make a difference in practice >>>>> i.e. when FIQs are actually used. >>>>> >>>>> Signed-off-by: Nicolas Pitre >>>> >>>> Reviewed-by: Daniel Lezcano >>> >>> What kind of review did you do when giving that attributation? >> >> I did the review to the best of my knowledge and with good will. >> >> I read your comment on this patch and I learnt one more thing. >> >> Today, I am smarter than yesterday and dumber than tomorrow :) > > Just be aware that putting a comment along with the reviewed-by tag > is always a good idea. I know that's a little more work, but this has > been raised a number of times by various people over the years. > > A reviewed-by tag on its own doesn't mean much, as it could mean that > you've just glanced over the code and decided "yea, it looks okay", or > it could mean that you've spent all day verifying that the code change > is indeed correct. > > Consequently, some will ignore emails which just contain a reviewed-by > attributation. Thanks for the clarification. I will take care of giving a comment next time. -- Daniel -- Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog From mboxrd@z Thu Jan 1 00:00:00 1970 From: daniel.lezcano@linaro.org (Daniel Lezcano) Date: Mon, 27 Jan 2014 18:30:46 +0100 Subject: [PATCH 1/9] ARM: get rid of arch_cpu_idle_prepare() In-Reply-To: <20140127172110.GR15937@n2100.arm.linux.org.uk> References: <1390802904-28399-1-git-send-email-nicolas.pitre@linaro.org> <1390802904-28399-2-git-send-email-nicolas.pitre@linaro.org> <52E6175F.1050401@linaro.org> <20140127160736.GP15937@n2100.arm.linux.org.uk> <52E69395.9020004@linaro.org> <20140127172110.GR15937@n2100.arm.linux.org.uk> Message-ID: <52E697C6.10809@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 01/27/2014 06:21 PM, Russell King - ARM Linux wrote: > On Mon, Jan 27, 2014 at 06:12:53PM +0100, Daniel Lezcano wrote: >> On 01/27/2014 05:07 PM, Russell King - ARM Linux wrote: >>> On Mon, Jan 27, 2014 at 09:22:55AM +0100, Daniel Lezcano wrote: >>>> On 01/27/2014 07:08 AM, Nicolas Pitre wrote: >>>>> ARM and ARM64 are the only two architectures implementing >>>>> arch_cpu_idle_prepare() simply to call local_fiq_enable(). >>>>> >>>>> We have secondary_start_kernel() already calling local_fiq_enable() and >>>>> this is done a second time in arch_cpu_idle_prepare() in that case. And >>>>> enabling FIQs has nothing to do with idling the CPU to start with. >>>>> >>>>> So let's introduce init_fiq_boot_cpu() to take care of FIQs on the boot >>>>> CPU and remove arch_cpu_idle_prepare(). This is now done a bit earlier >>>>> at late_initcall time but this shouldn't make a difference in practice >>>>> i.e. when FIQs are actually used. >>>>> >>>>> Signed-off-by: Nicolas Pitre >>>> >>>> Reviewed-by: Daniel Lezcano >>> >>> What kind of review did you do when giving that attributation? >> >> I did the review to the best of my knowledge and with good will. >> >> I read your comment on this patch and I learnt one more thing. >> >> Today, I am smarter than yesterday and dumber than tomorrow :) > > Just be aware that putting a comment along with the reviewed-by tag > is always a good idea. I know that's a little more work, but this has > been raised a number of times by various people over the years. > > A reviewed-by tag on its own doesn't mean much, as it could mean that > you've just glanced over the code and decided "yea, it looks okay", or > it could mean that you've spent all day verifying that the code change > is indeed correct. > > Consequently, some will ignore emails which just contain a reviewed-by > attributation. Thanks for the clarification. I will take care of giving a comment next time. -- Daniel -- Linaro.org ? Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog