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From: Will Deacon <will@kernel.org>
To: Jinjie Ruan <ruanjinjie@huawei.com>
Cc: catalin.marinas@arm.com, tsbogend@alpha.franken.de,
	tglx@kernel.org, mingo@redhat.com, bp@alien8.de,
	dave.hansen@linux.intel.com, hpa@zytor.com, peterz@infradead.org,
	kees@kernel.org, nathan@kernel.org, linusw@kernel.org,
	ojeda@kernel.org, david.kaplan@amd.com, lukas.bulwahn@redhat.com,
	ryan.roberts@arm.com, maz@kernel.org, timothy.hayes@arm.com,
	lpieralisi@kernel.org, thuth@redhat.com,
	menglong8.dong@gmail.com, oupton@kernel.org, yeoreum.yun@arm.com,
	miko.lenczewski@arm.com, broonie@kernel.org,
	kevin.brodsky@arm.com, james.clark@linaro.org,
	yangyicong@hisilicon.com, tabba@google.com, osandov@fb.com,
	arnd@arndb.de, anshuman.khandual@arm.com, david@kernel.org,
	akpm@linux-foundation.org, ljs@kernel.org, dev.jain@arm.com,
	yang@os.amperecomputing.com, chaitanyas.prakash@arm.com,
	kprateek.nayak@amd.com, chenl311@chinatelecom.cn,
	sshegde@linux.ibm.com, thorsten.blum@linux.dev,
	chang.seok.bae@intel.com, tim.c.chen@linux.intel.com,
	x86@kernel.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org
Subject: Re: [PATCH v3 00/12] arm64: Add HOTPLUG_PARALLEL support for secondary CPUs
Date: Mon, 6 Jul 2026 18:39:03 +0100	[thread overview]
Message-ID: <akvoN5vvQaW3MdmI@willie-the-truck> (raw)
In-Reply-To: <32d41a67-cf37-4079-8218-bed2b73bbf14@huawei.com>

Hi Jinjie,

On Thu, Jun 25, 2026 at 09:34:36AM +0800, Jinjie Ruan wrote:
> On 6/24/2026 8:16 PM, Will Deacon wrote:
> > Please just give me the time I asked for. If you want to help out in the
> > meantime, there are plenty of patches that need reviewing...
> 
> It was a mistake on my part, and I sincerely apologize for wasting
> community review resources and disrupting your schedule.
> 
> I will absolutely back off now and wait for your official series. Lesson
> learned. Thanks for your patience and for calling me out on this.

So I've mostly got the old series back on its feet:

  https://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git/log/?h=cpu-hotplug

but there are still two issues left to resolve:

  1. The printing that can happen before RCU has started. Although I've
     reduced this somewhat, there are still error paths in e.g.
     verify_local_cpu_capabilities() that print a message before dying.

  2. check_local_cpu_capabilities() can mutate the system capability
     state via update_cpu_capabilities(), so it's really dodgy running
     that prior to synchronisation.

Since you've added patches in this series that try to tackle these
problems, I'll reply on those two so we can figure out how we would like
to proceed.

Cheers,

Will


  reply	other threads:[~2026-07-06 17:39 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-06-24  9:25 [PATCH v3 00/12] arm64: Add HOTPLUG_PARALLEL support for secondary CPUs Jinjie Ruan
2026-06-24  9:25 ` [PATCH v3 01/12] cpu/hotplug: Introduce CONFIG_HOTPLUG_PARALLEL_SMT Jinjie Ruan
2026-06-24  9:25 ` [PATCH v3 02/12] cpu/hotplug: Propagate bring-up status to arch_cpuhp_cleanup_kick_cpu() Jinjie Ruan
2026-06-24  9:25 ` [PATCH v3 03/12] arm64: smp: Tidy up smp_prepare_cpus() Jinjie Ruan
2026-06-24  9:25 ` [PATCH v3 04/12] arm64: smp: Tidy up cpuinfo init and cpufeature updates Jinjie Ruan
2026-06-24  9:25 ` [PATCH v3 05/12] arm64: smp: Defer RCU registration during secondary CPU bringup Jinjie Ruan
2026-07-06 17:39   ` Will Deacon
2026-07-07  3:02     ` Jinjie Ruan
2026-07-07 10:27       ` Will Deacon
2026-07-08  9:13         ` Jinjie Ruan
2026-06-24  9:25 ` [PATCH v3 06/12] arm64: smp: Use generic HOTPLUG_SPLIT_STARTUP machinery for CPU onlining Jinjie Ruan
2026-06-24  9:25 ` [PATCH v3 07/12] arm64: cpu_ops: Make 'cpu_operations' pointer global instead of per-cpu Jinjie Ruan
2026-06-24  9:25 ` [PATCH v3 08/12] arm64: cpu_ops: Introduce get_secondary_cpu_ops() Jinjie Ruan
2026-06-24  9:25 ` [PATCH v3 09/12] arm64: cpufeature: Ensure atomic updates to system_cpucaps bitmap Jinjie Ruan
2026-07-06 17:40   ` Will Deacon
2026-07-07  3:24     ` Jinjie Ruan
2026-07-08 10:01     ` Jinjie Ruan
2026-06-24  9:25 ` [PATCH v3 10/12] arm64: smp: Pass CPU ID to update_cpu_boot_status() Jinjie Ruan
2026-06-24  9:25 ` [PATCH v3 11/12] arm64: smp: Rework early boot data into per-CPU arrays Jinjie Ruan
2026-06-24  9:25 ` [PATCH v3 12/12] arm64: Add HOTPLUG_PARALLEL support for secondary CPUs Jinjie Ruan
2026-07-07  4:00   ` Jinjie Ruan
2026-07-07 10:30     ` Will Deacon
2026-06-24 12:16 ` [PATCH v3 00/12] " Will Deacon
2026-06-24 14:59   ` Borislav Petkov
2026-06-25  1:34   ` Jinjie Ruan
2026-07-06 17:39     ` Will Deacon [this message]
2026-07-07  8:14       ` Jinjie Ruan
2026-07-07 10:37         ` Will Deacon
2026-07-08  9:36           ` Jinjie Ruan
2026-06-29  4:04 ` Shrikanth Hegde

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