From mboxrd@z Thu Jan  1 00:00:00 1970
From: Yinghai <yinghai.lu@oracle.com>
Subject: Re: [PATCH 26/39] nobootmem: use lmb.default_alloc_limit in alloc_bootmem
 path
Date: Mon, 12 Apr 2010 21:50:50 -0700
Message-ID: <4BC3F82A.20400@oracle.com>
References: <1270793048-23796-1-git-send-email-yinghai@kernel.org>	 <1270793048-23796-27-git-send-email-yinghai@kernel.org> <1271132589.13059.67.camel@pasglop>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
Return-path: <linux-arch-owner@vger.kernel.org>
Received: from rcsinet11.oracle.com ([148.87.113.123]:46005 "EHLO
	rcsinet11.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1751499Ab0DMEy3 (ORCPT
	<rfc822;linux-arch@vger.kernel.org>); Tue, 13 Apr 2010 00:54:29 -0400
In-Reply-To: <1271132589.13059.67.camel@pasglop>
Sender: linux-arch-owner@vger.kernel.org
List-ID: <linux-arch.vger.kernel.org>
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 04/12/2010 09:23 PM, Benjamin Herrenschmidt wrote:
> On Thu, 2010-04-08 at 23:03 -0700, Yinghai Lu wrote:
>> Generic version __lmb_find_area() is going from high to low, and for 32bit
>> active_region for 32bit does include high pages
>>
>> need to replace the limit with lmb.default_alloc_limit, aka get_max_mapped()
>>
>> with this patch, x86 32bit could use generic version of __lmb_find_area()
> 
> So you unconditionally add access to some lmb specific data structure to
> generic code ? That isn't going to work very well on archs that don't
> use lmb.

the whole function

#ifdef CONFIG_HAVE_LMB
u64 __init find_memory_core_early(int nid, u64 size, u64 align,
                                        u64 goal, u64 limit)
{
        int i;

        /* Need to go over early_node_map to find out good range for node */
        for_each_active_range_index_in_nid(i, nid) {
                u64 addr;
                u64 ei_start, ei_last;

                ei_last = early_node_map[i].end_pfn;
                ei_last <<= PAGE_SHIFT;
                ei_start = early_node_map[i].start_pfn;
                ei_start <<= PAGE_SHIFT;
                addr = __lmb_find_area(ei_start, ei_last,
                                         goal, limit, size, align);

                if (addr == -1ULL)
                        continue;

                return addr;
        }

        return -1ULL;
}
#endif

need to access early_node_map[], so leave the function here.


> 
> Also, those things should be local to lmb_* anyways.

if you insist, could move it to lmb.c and use work_with_active_regions() around it.

YH