From: Qais Yousef <qais.yousef@arm.com>
To: Helge Deller <deller@gmx.de>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
Richard Fontana <rfontana@redhat.com>,
Armijn Hemel <armijn@tjaldur.nl>,
linux-parisc@vger.kernel.org, linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: [PATCH 06/12] parisc: Replace cpu_up/down with device_online/offline
Date: Sun, 24 Nov 2019 10:20:22 +0000 [thread overview]
Message-ID: <20191124102021.k4oi3r4rgorikxnc@e107158-lin.cambridge.arm.com> (raw)
In-Reply-To: <057185a2-e876-4237-c0bf-8754d302fdfc@gmx.de>
On 11/22/19 20:51, Helge Deller wrote:
> On 20.11.19 12:09, Qais Yousef wrote:
> > On 10/30/19 15:38, Qais Yousef wrote:
> >> The core device API performs extra housekeeping bits that are missing
> >> from directly calling cpu_up/down.
> >>
> >> See commit a6717c01ddc2 ("powerpc/rtas: use device model APIs and
> >> serialization during LPM") for an example description of what might go
> >> wrong.
> >>
> >> This also prepares to make cpu_up/down a private interface for anything
> >> but the cpu subsystem.
> >>
> >> Signed-off-by: Qais Yousef <qais.yousef@arm.com>
> >> CC: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
> >> CC: Helge Deller <deller@gmx.de>
> >> CC: Richard Fontana <rfontana@redhat.com>
> >> CC: Armijn Hemel <armijn@tjaldur.nl>
> >> CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> >> CC: Thomas Gleixner <tglx@linutronix.de>
> >> CC: linux-parisc@vger.kernel.org
> >> CC: linux-kernel@vger.kernel.org
> >> ---
> >>
> >> Couldn't compile test this one.
> >>
> >> I'm not confident that this is a correct patch to be honest. This __init
> >> indicates we're booting the secondary cpus and that might be too early in the
> >> process to use the core API..?
> >
> > Helge, James
> >
> > Do you have any comment on this? I have no means to test it and I'd
> > appreciate if you can spin it through one of your systems.
>
> I pulled your cpu-hp-cleanup branch from git://linux-arm.org/linux-qy
> and compiled a 32- and a 64-bit parisc kernel.
>
> I faced one compile warning:
> linux-2.6/kernel/cpu.c: In function ‘hibernation_bringup_sleep_cpu’:
> linux-2.6/kernel/cpu.c:1237:1: warning: control reaches end of non-void function [-Wreturn-type]
>
> Other than that the 32- and 64-bit SMP kernel booted nicely.
> You may add to the series:
> Acked-by: Helge Deller <deller@gmx.de> # parisc
Great! Thanks for testing it and reporting the warning.
Cheers
--
Qais Yousef
>
> Thanks,
> Helge
>
>
> >>
> >> arch/parisc/kernel/processor.c | 4 +++-
> >> 1 file changed, 3 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/arch/parisc/kernel/processor.c b/arch/parisc/kernel/processor.c
> >> index 13f771f74ee3..4dde5fe78f0c 100644
> >> --- a/arch/parisc/kernel/processor.c
> >> +++ b/arch/parisc/kernel/processor.c
> >> @@ -212,7 +212,9 @@ static int __init processor_probe(struct parisc_device *dev)
> >> #ifdef CONFIG_SMP
> >> if (cpuid) {
> >> set_cpu_present(cpuid, true);
> >> - cpu_up(cpuid);
> >> + lock_device_hotplug();
> >> + device_online(get_cpu_device(cpuid));
> >> + unlock_device_hotplug();
> >> }
> >> #endif
> >>
> >> --
> >> 2.17.1
> >>
>
prev parent reply other threads:[~2019-11-24 10:20 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20191030153837.18107-1-qais.yousef@arm.com>
2019-10-30 15:38 ` [PATCH 06/12] parisc: Replace cpu_up/down with device_online/offline Qais Yousef
2019-11-20 11:09 ` Qais Yousef
2019-11-22 19:51 ` Helge Deller
2019-11-24 10:20 ` Qais Yousef [this message]
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