From: Qais Yousef <qais.yousef@arm.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Steve Capper <steve.capper@arm.com>,
Richard Fontana <rfontana@redhat.com>,
James Morse <james.morse@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Ingo Molnar <mingo@kernel.org>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>,
Nicholas Piggin <npiggin@gmail.com>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Jiri Kosina <jkosina@suse.cz>,
Pavankumar Kondeti <pkondeti@codeaurora.org>,
Zhenzhong Duan <zhenzhong.duan@oracle.com>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 01/12] arm64: hibernate.c: create a new function to handle cpu_up(sleep_cpu)
Date: Tue, 19 Nov 2019 23:21:31 +0000 [thread overview]
Message-ID: <20191119232130.kz4cmqlpmc4by7cj@e107158-lin.cambridge.arm.com> (raw)
In-Reply-To: <alpine.DEB.2.21.1911192359530.6731@nanos.tec.linutronix.de>
On 11/20/19 00:01, Thomas Gleixner wrote:
> On Tue, 19 Nov 2019, Qais Yousef wrote:
> > On 11/19/19 23:31, Thomas Gleixner wrote:
> > > On Wed, 30 Oct 2019, Qais Yousef wrote:
> > > >
> > > > +int hibernation_bringup_sleep_cpu(unsigned int sleep_cpu)
> > >
> > > That function name is horrible. Aside of that I really have to ask how you
> > > end up hibernating on an offline CPU?
> >
> > James Morse can probably explain better.
> >
> > But AFAIU we could sleep on any CPU, but on the next cold boot that CPU could
> > become offline as a side effect of using maxcpus= for example.
> >
> > How about bringup_hibernate_cpu() as a name? I could add the above as an
> > explanation of why we need this call too.
> >
> > It does seem to me that this is a generic problem that we might be able to
> > handle generically, but I'm not sure how.
>
> Don't know about other architectures, but x86 does not have that issue as
> we force hibernation on CPU0 for historical reasons (Broken BIOSes etc.).
I'll avoid making this series bigger then.
Thanks
--
Qais Yousef
next prev parent reply other threads:[~2019-11-19 23:21 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20191030153837.18107-1-qais.yousef@arm.com>
2019-10-30 15:38 ` [PATCH 01/12] arm64: hibernate.c: create a new function to handle cpu_up(sleep_cpu) Qais Yousef
2019-11-19 22:31 ` Thomas Gleixner
2019-11-19 22:51 ` Qais Yousef
2019-11-19 23:01 ` Thomas Gleixner
2019-11-19 23:21 ` Qais Yousef [this message]
2019-10-30 15:38 ` [PATCH 02/12] x86: Replace cpu_up/down with devcie_online/offline Qais Yousef
2019-10-30 15:38 ` [PATCH 03/12] powerpc: Replace cpu_up/down with device_online/offline Qais Yousef
2019-11-19 1:19 ` Michael Ellerman
2019-11-19 9:47 ` Qais Yousef
2019-10-30 15:38 ` [PATCH 04/12] ia64: Replace cpu_down with freeze_secondary_cpus Qais Yousef
2019-11-02 4:59 ` kbuild test robot
2019-11-19 22:21 ` Thomas Gleixner
2019-11-19 22:32 ` Qais Yousef
2019-11-19 22:59 ` Thomas Gleixner
2019-11-19 23:19 ` Qais Yousef
2019-11-20 8:46 ` Thomas Gleixner
2019-11-20 10:49 ` Qais Yousef
2019-10-30 15:38 ` [PATCH 05/12] sparc: Replace cpu_up/down with device_online/offline Qais Yousef
2019-10-30 19:33 ` David Miller
2019-10-30 15:38 ` [PATCH 06/12] parisc: " Qais Yousef
2019-11-20 11:09 ` Qais Yousef
2019-11-22 19:51 ` Helge Deller
2019-11-24 10:20 ` Qais Yousef
2019-10-30 15:38 ` [PATCH 07/12] driver: base: cpu: export device_online/offline Qais Yousef
2019-11-02 17:17 ` Greg Kroah-Hartman
2019-10-30 15:38 ` [PATCH 08/12] driver: xen: Replace cpu_up/down with device_online/offline Qais Yousef
2019-10-30 15:38 ` [PATCH 09/12] firmware: psci: " Qais Yousef
2019-10-30 15:38 ` [PATCH 10/12] torture: " Qais Yousef
2019-10-30 15:38 ` [PATCH 11/12] smp: Create a new function to bringup nonboot cpus online Qais Yousef
2019-11-19 22:42 ` Thomas Gleixner
2019-10-30 15:38 ` [PATCH 12/12] cpu: Hide cpu_up/down Qais Yousef
2019-11-19 22:25 ` Thomas Gleixner
2019-11-19 22:36 ` Qais Yousef
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