linux-kernel - Re: [PATCH 11/14] x86: Populate cpu_enabled

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Date:	Fri, 18 Jul 2008 13:00:23 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Alex Chiang <achiang@...com>, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, linux-acpi@...r.kernel.org,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>, hpa@...or.com
Subject: Re: [PATCH 11/14] x86: Populate cpu_enabled_map

Alex Chiang wrote:
> Populate the cpu_enabled_map correctly.
> 
> Note that this patch does not actually make any decisions based
> on the contents of the map.
> 
> However, as the map is presented via sysfs in:
> 
> 	/sys/devices/system/cpu/
> 
> It should be populated correctly.
> 
> There will be a user-visible change under the above directory.
> cpuN/ entries for firmware-disabled CPUs will now appear, whereas
> before, they did not due to a check against ACPI_MADT_ENABLED.
> 
> The cpuN/ entries will be empty, and the online file in the
> above directory will reflect which CPUs are actually schedulable.
> 
> Signed-off-by: Alex Chiang <achiang@...com>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: H. Peter Anvin <hpa@...or.com>

 From an x86 standpoint this patchset seems reasonable to me.

Acked-by: H. Peter Anvin <hpa@...or.com>

Since it is a panarch patchset it presumably should go via -mm rather 
than in the arch trees, so I'm not going to add it to -tip.

Obviously, if the sematics of the operations don't make sense for other 
architectures -- which I will leave up to the affected maintainers -- 
then that should be carefully considered if the generic operations can 
be done better.

	-hpa
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