linux-kernel - Re: [Patch] x86: fix a wrong argument of reserve

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Message-ID: <20090821143918.GI11098@elte.hu>
Date:	Fri, 21 Aug 2009 16:39:18 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Amerigo Wang <amwang@...hat.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	yinghai@...nel.org
Subject: Re: [Patch] x86: fix a wrong argument of reserve_bootmem()


* Amerigo Wang <amwang@...hat.com> wrote:

> This line looks suspicious, because if this is true, then the 
> 'flags' parameter of function reserve_bootmem_generic() will be 
> unused when !CONFIG_NUMA. I don't think this is what we want.
> 
> Signed-off-by: WANG Cong <amwang@...hat.com>
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: Yinghai Lu <yinghai@...nel.org>
> 
> ---
> diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
> index 6176fe8..ea56b8c 100644
> --- a/arch/x86/mm/init_64.c
> +++ b/arch/x86/mm/init_64.c
> @@ -796,7 +796,7 @@ int __init reserve_bootmem_generic(unsigned long phys, unsigned long len,
>  		return ret;
>  
>  #else
> -	reserve_bootmem(phys, len, BOOTMEM_DEFAULT);
> +	reserve_bootmem(phys, len, flags);

Yes, this looks like an oversight. Since it only affected 32-bit 
NUMA materially, which is quite rare, it probably didnt matter that 
much but should be fixed ...

	Ingo
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