From: Tejun Heo <tj@kernel.org>
To: Tang Chen <tangchen@cn.fujitsu.com>
Cc: mingo@redhat.com, akpm@linux-foundation.org, rjw@rjwysocki.net,
hpa@zytor.com, laijs@cn.fujitsu.com, yasu.isimatu@gmail.com,
isimatu.yasuaki@jp.fujitsu.com, kamezawa.hiroyu@jp.fujitsu.com,
izumi.taku@jp.fujitsu.com, gongzhaogang@inspur.com,
qiaonuohan@cn.fujitsu.com, x86@kernel.org,
linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, Gu Zheng <guz.fnst@cn.fujitsu.com>
Subject: Re: [PATCH 4/5] x86, acpi, cpu-hotplug: Enable MADT APIs to return disabled apicid.
Date: Wed, 15 Jul 2015 18:06:25 -0400 [thread overview]
Message-ID: <20150715220625.GN15934@mtj.duckdns.org> (raw)
In-Reply-To: <1436261425-29881-5-git-send-email-tangchen@cn.fujitsu.com>
Hello,
On Tue, Jul 07, 2015 at 05:30:24PM +0800, Tang Chen wrote:
> From: Gu Zheng <guz.fnst@cn.fujitsu.com>
>
> All processors' apicids can be obtained by _MAT method or from MADT in ACPI.
> The current code ignores disabled processors and returns -ENODEV.
>
> After this patch, a new parameter will be added to MADT APIs so that caller
> is able to control if disabled processors are ignored.
This describes what the patch does but doesn't really explain what the
patch is trying to achieve.
> @@ -282,8 +282,11 @@ static int acpi_processor_get_info(struct acpi_device *device)
> * Extra Processor objects may be enumerated on MP systems with
> * less than the max # of CPUs. They should be ignored _iff
> * they are physically not present.
> + *
> + * NOTE: Even if the processor has a cpuid, it may not present because
^
be
> + * cpuid <-> apicid mapping is persistent now.
Saying "now" is kinda weird as this is how the code is gonna be
forever.
Thanks.
--
tejun
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next prev parent reply other threads:[~2015-07-15 22:06 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-07 9:30 [PATCH 0/5] Make cpuid <-> nodeid mapping persistent Tang Chen
2015-07-07 9:30 ` [PATCH 1/5] x86, gfp: Cache best near node for memory allocation Tang Chen
2015-07-15 21:48 ` Tejun Heo
2015-08-04 3:36 ` Tang Chen
2015-08-04 8:05 ` Jiang Liu
2015-08-04 8:24 ` Tang Chen
2015-08-09 6:15 ` Tang Chen
2015-08-12 1:53 ` Jiang Liu
2015-08-04 8:26 ` gongzhaogang
2015-08-04 8:53 ` Tang Chen
2015-08-04 8:58 ` Tang Chen
2015-07-07 9:30 ` [PATCH 2/5] x86, acpi, cpu-hotplug: Enable acpi to register all possible cpus at boot time Tang Chen
2015-07-07 9:30 ` [PATCH 3/5] x86, acpi, cpu-hotplug: Introduce apicid_to_cpuid[] array to store persistent cpuid <-> apicid mapping Tang Chen
2015-07-07 11:14 ` Mika Penttilä
2015-07-15 3:33 ` Tang Chen
2015-07-15 5:35 ` Jiang Liu
2015-07-15 6:26 ` Tang Chen
2015-07-15 22:02 ` Tejun Heo
2015-07-07 9:30 ` [PATCH 4/5] x86, acpi, cpu-hotplug: Enable MADT APIs to return disabled apicid Tang Chen
2015-07-15 22:06 ` Tejun Heo [this message]
2015-07-07 9:30 ` [PATCH 5/5] x86, acpi, cpu-hotplug: Set persistent cpuid <-> nodeid mapping when booting Tang Chen
2015-07-15 22:13 ` [PATCH 0/5] Make cpuid <-> nodeid mapping persistent Tejun Heo
2015-07-23 4:44 ` Tang Chen
2015-07-23 18:32 ` Tejun Heo
-- strict thread matches above, loose matches on Subject: below --
2016-01-07 4:20 [PATCH v4 " Tang Chen
2016-01-07 4:20 ` [PATCH 4/5] x86, acpi, cpu-hotplug: Enable MADT APIs to return disabled apicid Tang Chen
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