Date: Mon, 23 Sep 2013 16:21:47 -0400
From: Tejun Heo <tj@kernel.org>
To: Zhang Yanfei <zhangyanfei.yes@gmail.com>
Cc: Tang Chen <tangchen@cn.fujitsu.com>, rjw@sisk.pl, lenb@kernel.org,
        tglx@linutronix.de, mingo@elte.hu, hpa@zytor.com,
        akpm@linux-foundation.org, toshi.kani@hp.com,
        zhangyanfei@cn.fujitsu.com, liwanp@linux.vnet.ibm.com, trenn@suse.de,
        yinghai@kernel.org, jiang.liu@huawei.com, wency@cn.fujitsu.com,
        laijs@cn.fujitsu.com, isimatu.yasuaki@jp.fujitsu.com,
        izumi.taku@jp.fujitsu.com, mgorman@suse.de, minchan@kernel.org,
        mina86@mina86.com, gong.chen@linux.intel.com,
        vasilis.liaskovitis@profitbricks.com, lwoodman@redhat.com,
        riel@redhat.com, jweiner@redhat.com, prarit@redhat.com, x86@kernel.org,
        linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, linux-acpi@vger.kernel.org
Subject: Re: [PATCH v3 2/5] memblock: Improve memblock to support allocation
 from lower address.
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Hello,

On Tue, Sep 24, 2013 at 02:07:13AM +0800, Zhang Yanfei wrote:
> Yes, I am following your advice in principle but kind of confused by
> something you said above. Where should the set_memblock_alloc_above_kernel
> be used? IMO, the function is like:
> 
> find_in_range_node()
> {
>      if (ok) {
>            /* bottom-up */
>            ret = __memblock_find_in_range(max(start, _end_of_kernel), end...);
>            if (!ret)
>                  return ret;
>      }
> 
>      /* top-down retry */
>      return __memblock_find_in_range_rev(start, end...)
> }
> 
> For bottom-up allocation, we always start from max(start, _end_of_kernel).

Oh, I was talking about naming of the memblock_set_bottom_up()
function.  We aren't really doing pure bottom up allocations, so I
think it probably would be clearer if the name clearly denotes that
we're doing above-kernel allocation.

Thanks.

-- 
tejun
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