linux-kernel - Re: [PATCH v2 13/18] x86, numa, mem_hotplug: Skip all the regions the kernel resides in.

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Date:	Fri, 02 Aug 2013 13:51:33 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	Tejun Heo <tj@...nel.org>
CC:	rjw@...k.pl, lenb@...nel.org, tglx@...utronix.de, mingo@...e.hu,
	hpa@...or.com, akpm@...ux-foundation.org, trenn@...e.de,
	yinghai@...nel.org, jiang.liu@...wei.com, wency@...fujitsu.com,
	laijs@...fujitsu.com, isimatu.yasuaki@...fujitsu.com,
	izumi.taku@...fujitsu.com, mgorman@...e.de, minchan@...nel.org,
	mina86@...a86.com, gong.chen@...ux.intel.com,
	vasilis.liaskovitis@...fitbricks.com, lwoodman@...hat.com,
	riel@...hat.com, jweiner@...hat.com, prarit@...hat.com,
	zhangyanfei@...fujitsu.com, yanghy@...fujitsu.com, x86@...nel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, linux-acpi@...r.kernel.org
Subject: Re: [PATCH v2 13/18] x86, numa, mem_hotplug: Skip all the regions
 the kernel resides in.

On 08/01/2013 09:42 PM, Tejun Heo wrote:
>> On Thu, Aug 01, 2013 at 03:06:35PM +0800, Tang Chen wrote:
>>
>> At early time, memblock will reserve some memory for the kernel,
>> such as the kernel code and data segments, initrd file, and so on=EF=BC=8C
>> which means the kernel resides in these memory regions.
>>
>> Even if these memory regions are hotpluggable, we should not
>> mark them as hotpluggable. Otherwise the kernel won't have enough
>> memory to boot.
>>
>> This patch finds out which memory regions the kernel resides in,
>> and skip them when finding all hotpluggable memory regions.
>>
>> Signed-off-by: Tang Chen<tangchen@...fujitsu.com>
>> Reviewed-by: Zhang Yanfei<zhangyanfei@...fujitsu.com>
>> ---
>>   mm/memory=5Fhotplug.c |   45 +++++++++++++++++++++++++++++++++++++++++++++
>>    1 files changed, 45 insertions(+), 0 deletions(-)
>>
>> diff --git a/mm/memory=5Fhotplug.c b/mm/memory=5Fhotplug.c
>> index 326e2f2..b800c9c 100644
>> --- a/mm/memory=5Fhotplug.c
>> +++ b/mm/memory=5Fhotplug.c
>> @@ -31,6 +31,7 @@
>>   #include<linux/firmware-map.h>
>>   #include<linux/stop=5Fmachine.h>
>>   #include<linux/acpi.h>
>> +#include<linux/memblock.h>
>> =20
>>   #include<asm/tlbflush.h>
>> =20
>
> This patch is contaminated.  Can you please resend?It

It's wired. I'll rebase these patches to linux 3.11-rc3 and resend them all.

Thanks.
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