linux-kernel - Re: [PATCH] mm/hotplug, x86: Disable ARCH_MEMORY

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Message-ID: <51E80973.9000308@intel.com>
Date:	Thu, 18 Jul 2013 08:27:47 -0700
From:	Dave Hansen <dave.hansen@...el.com>
To:	Toshi Kani <toshi.kani@...com>
CC:	akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	isimatu.yasuaki@...fujitsu.com, tangchen@...fujitsu.com,
	vasilis.liaskovitis@...fitbricks.com
Subject: Re: [PATCH] mm/hotplug, x86: Disable ARCH_MEMORY_PROBE by default

On 07/17/2013 02:45 PM, Toshi Kani wrote:
> +CONFIG_ARCH_MEMORY_PROBE is supported on powerpc only. On x86, this config
> +option is disabled by default since ACPI notifies a memory hotplug event to
> +the kernel, which performs its hotplug operation as the result. Please
> +enable this option if you need the "probe" interface on x86.

There's no prompt for this and no way to override what you've done here
without hacking Kconfig/.config files.

It's also completely wrong to say "CONFIG_ARCH_MEMORY_PROBE is supported
on powerpc only."  It works just fine on x86.  In fact, I was just using
it today without ACPI being around.

I'd really prefer you don't do this.  Do you really have random
processes on your system poking at random sysfs files and then
complaining when things break?
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