linux-kernel - Re: [patch 2/2] bootmem: Node-setup agnostic free

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Message-ID: <86802c440804121859x42847c2cx37b8cd909b14c6b5@mail.gmail.com>
Date:	Sat, 12 Apr 2008 18:59:56 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Johannes Weiner" <hannes@...urebad.de>
Cc:	linux-kernel@...r.kernel.org, "Andi Kleen" <ak@...e.de>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Yasunori Goto" <y-goto@...fujitsu.com>,
	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>,
	"Christoph Lameter" <clameter@....com>
Subject: Re: [patch 2/2] bootmem: Node-setup agnostic free_bootmem()

On Sat, Apr 12, 2008 at 3:33 PM, Johannes Weiner <hannes@...urebad.de> wrote:
> Make free_bootmem() look up the node holding the specified address
>  range which lets it work transparently on single-node and multi-node
>  configurations.
>
>  Signed-off-by: Johannes Weiner <hannes@...urebad.de>
>  CC: Yinghai Lu <yhlu.kernel@...il.com>
>  CC: Andi Kleen <ak@...e.de>
>  CC: Yasunori Goto <y-goto@...fujitsu.com>
>  CC: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
>  CC: Ingo Molnar <mingo@...e.hu>
>  CC: Christoph Lameter <clameter@....com>
>  CC: Andrew Morton <akpm@...ux-foundation.org>
>  ---
>
>  Patch tested on x86_32 uma.
>
>  Index: linux-2.6/mm/bootmem.c
>  ===================================================================
>  --- linux-2.6.orig/mm/bootmem.c
>  +++ linux-2.6/mm/bootmem.c
>  @@ -421,7 +421,15 @@ int __init reserve_bootmem(unsigned long
>
>   void __init free_bootmem(unsigned long addr, unsigned long size)
>   {
>  -       free_bootmem_core(NODE_DATA(0)->bdata, addr, size);
>  +       bootmem_data_t *bdata;
>  +
>  +       list_for_each_entry (bdata, &bdata_list, list) {
>  +               if (addr < bdata->node_boot_start)
>  +                       continue;

could have chance that bootmem with reserved_early that is crossing the nodes.

YH


YH
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