From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Lezcano Subject: Re: [PATCH 8/9] ARM: zynq: Remove hotplug.c Date: Thu, 21 Aug 2014 03:32:22 +0200 Message-ID: <53F54C26.5010000@linaro.org> References: <1408567315-28479-1-git-send-email-soren.brinkmann@xilinx.com> <1408567315-28479-9-git-send-email-soren.brinkmann@xilinx.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <1408567315-28479-9-git-send-email-soren.brinkmann@xilinx.com> Sender: linux-kernel-owner@vger.kernel.org To: Soren Brinkmann , Michal Simek , Russell King , "Rafael J. Wysocki" , Rob Herring , Mark Rutland Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-pm@vger.kernel.org, Pawel Moll , Ian Campbell , Kumar Gala List-Id: devicetree@vger.kernel.org On 08/20/2014 10:41 PM, Soren Brinkmann wrote: > The hotplug code contains only a single function, which is an SMP > function. Move that to platsmp.c where all other SMP runctions reside= =2E > That allows removing hotplug.c and declaring the cpu_die function > static. > > Signed-off-by: Soren Brinkmann > --- > arch/arm/mach-zynq/Makefile | 1 - > arch/arm/mach-zynq/common.h | 3 +-- > arch/arm/mach-zynq/hotplug.c | 17 ----------------- > arch/arm/mach-zynq/platsmp.c | 18 ++++++++++++++++++ > 4 files changed, 19 insertions(+), 20 deletions(-) > > diff --git a/arch/arm/mach-zynq/Makefile b/arch/arm/mach-zynq/Makefil= e > index 820dff6e1eba..c85fb3f7d5cd 100644 > --- a/arch/arm/mach-zynq/Makefile > +++ b/arch/arm/mach-zynq/Makefile > @@ -6,5 +6,4 @@ > obj-y :=3D common.o slcr.o pm.o > CFLAGS_REMOVE_hotplug.o =3D-march=3Darmv6k > CFLAGS_hotplug.o =3D-Wa,-march=3Darmv7-a -mcpu=3Dcortex-a9 > -obj-$(CONFIG_HOTPLUG_CPU) +=3D hotplug.o > obj-$(CONFIG_SMP) +=3D headsmp.o platsmp.o > diff --git a/arch/arm/mach-zynq/common.h b/arch/arm/mach-zynq/common.= h > index c0773e87e83c..e6bb12c50a23 100644 > --- a/arch/arm/mach-zynq/common.h > +++ b/arch/arm/mach-zynq/common.h > @@ -39,8 +39,7 @@ extern struct smp_operations zynq_smp_ops __initdat= a; > > extern void __iomem *zynq_scu_base; > > -/* Hotplug */ > -extern void zynq_platform_cpu_die(unsigned int cpu); > +int zynq_pm_late_init(void); > > int zynq_pm_late_init(void); > > diff --git a/arch/arm/mach-zynq/hotplug.c b/arch/arm/mach-zynq/hotplu= g.c > index fe44a05677e2..b685c89f11e4 100644 > --- a/arch/arm/mach-zynq/hotplug.c > +++ b/arch/arm/mach-zynq/hotplug.c > @@ -12,20 +12,3 @@ > */ > #include > > -/* > - * platform-specific code to shutdown a CPU > - * > - * Called with IRQs disabled > - */ > -void zynq_platform_cpu_die(unsigned int cpu) > -{ > - zynq_slcr_cpu_state_write(cpu, true); > - > - /* > - * there is no power-control hardware on this platform, so all > - * we can do is put the core into WFI; this is safe as the calling > - * code will have already disabled interrupts > - */ > - for (;;) > - cpu_do_idle(); > -} > diff --git a/arch/arm/mach-zynq/platsmp.c b/arch/arm/mach-zynq/platsm= p.c > index f77f7ca4c45b..04e578718aa2 100644 > --- a/arch/arm/mach-zynq/platsmp.c > +++ b/arch/arm/mach-zynq/platsmp.c > @@ -132,6 +132,24 @@ static int zynq_cpu_kill(unsigned cpu) > zynq_slcr_cpu_stop(cpu); > return 1; > } > + > +/* > + * platform-specific code to shutdown a CPU > + * > + * Called with IRQs disabled > + */ > +static void zynq_platform_cpu_die(unsigned int cpu) > +{ > + zynq_slcr_cpu_state_write(cpu, true); > + > + /* > + * there is no power-control hardware on this platform, so all > + * we can do is put the core into WFI; this is safe as the calling > + * code will have already disabled interrupts > + */ > + for (;;) > + cpu_do_idle(); IIUC, the cpu_do_idle() will flush the L1 cache and then call the WFI.=20 It makes sense if we are about to power down the core. So I am wonderin= g=20 if we can just call wfi() instead. > +} > #endif > > struct smp_operations zynq_smp_ops __initdata =3D { > --=20 Linaro.org =E2=94=82 Open source software fo= r ARM SoCs =46ollow Linaro: Facebook | Twitter | Blog