linux-kernel - Re: [PATCH] memory hotadd fixes [2/5] change find_next_system

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Message-Id: <1154649921.5925.40.camel@keithlap>
Date:	Thu, 03 Aug 2006 17:05:21 -0700
From:	keith mannthey <kmannth@...ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	lhms-devel <lhms-devel@...ts.sourceforge.net>,
	"y-goto@...fujitsu.com" <y-goto@...fujitsu.com>,
	Andrew Morton <akpm@...l.org>
Subject: Re: [PATCH] memory hotadd fixes [2/5] change
	find_next_system_ram's return value manner

On Thu, 2006-08-03 at 12:33 +0900, KAMEZAWA Hiroyuki wrote:
> find_next_system_ram() returns valid memory range which meets requested
> area, only used by memory-hot-add.
> This function always rewrite requested resource even if returned area is
> not fully fit in requested one. And sometimes the returnd resource is larger
> than requested area. This annoyes the caller.
> This patch changes the returned value to fit in requested area.
> 
> Signed-Off-By: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> 
>  kernel/resource.c |    6 ++++--
>  1 files changed, 4 insertions(+), 2 deletions(-)
> 
> Index: linux-2.6.18-rc3/kernel/resource.c
> ===================================================================
> --- linux-2.6.18-rc3.orig/kernel/resource.c	2006-08-01 16:11:56.000000000 +0900
> +++ linux-2.6.18-rc3/kernel/resource.c	2006-08-01 16:38:45.000000000 +0900
> @@ -261,8 +261,10 @@
>  	if (!p)
>  		return -1;
>  	/* copy data */
> -	res->start = p->start;
> -	res->end = p->end;
> +	if (res->start < p->start)
> +		res->start = p->start;
> +	if (res->end > p->end)
> +		res->end = p->end;
>  	return 0;
>  }
>  #endif


This is a needed fix for me.  It looks and works great on x86_64. 

Acked-By: Keith Mannthey <kmannth@...ibm.com>

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