From mboxrd@z Thu Jan  1 00:00:00 1970
From: Yinghai <yinghai.lu@oracle.com>
Subject: Re: [PATCH 03/35] lmb: Add ARCH_DISCARD_LMB to put lmb code to .init
Date: Thu, 13 May 2010 23:21:40 -0700
Message-ID: <4BECEBF4.7000402@oracle.com>
References: <1273796396-29649-1-git-send-email-yinghai@kernel.org>	 <1273796396-29649-4-git-send-email-yinghai@kernel.org> <1273803249.21352.357.camel@pasglop>
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To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>, "H. Peter Anvin" <hpa@zytor.com>, Andrew Morton <akpm@linux-foundation.org>, David Miller <davem@davemloft.net>, Linus Torvalds <torvalds@linux-foundation.org>, Johannes Weiner <hannes@cmpxchg.org>, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org

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