linux-kernel - Re: [PATCH 03/35] lmb: Add ARCH_DISCARD

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Date:	Thu, 13 May 2010 23:21:40 -0700
From:	Yinghai <yinghai.lu@...cle.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH 03/35] lmb: Add ARCH_DISCARD_LMB to put lmb code to .init

On 05/13/2010 07:14 PM, Benjamin Herrenschmidt wrote:
> On Thu, 2010-05-13 at 17:19 -0700, Yinghai Lu wrote:
>> So those lmb bits could be released after kernel is booted up.
>>
>> Arch code could define ARCH_DISCARD_LMB in asm/lmb.h,
>> __init_lmb will become __init, __initdata_lmb will becom __initdata
>>
>> x86 code will use that.
> 
> So you do not intend to use lmb after boot ? This will break the debugfs
> files unless you also remove those.

no, x86 don't lmb after boot.

yes


...

>> @@ -695,7 +695,7 @@ static int __init early_lmb(char *p)
>>  }
>>  early_param("lmb", early_lmb);
>>  
>> -#ifdef CONFIG_DEBUG_FS
>> +#if defined(CONFIG_DEBUG_FS) && !defined(ARCH_DISCARD_LMB)
>>  
>>  static int lmb_debug_show(struct seq_file *m, void *private)
>>  {
> 

it will check ARCH_DISCARD_LMB
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