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Date: Wed, 8 Oct 2008 06:38:07 +0900
From: "KOSAKI Motohiro" <kosaki.motohiro@jp.fujitsu.com>
To: "Andi Kleen" <andi@firstfloor.org>
Subject: Re: [PATCH, v3] shmat: introduce flag SHM_MAP_NOT_FIXED
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>, linux-kernel@vger.kernel.org,
       linux-mm@kvack.org, "Ingo Molnar" <mingo@redhat.com>,
       "Arjan van de Ven" <arjan@infradead.org>,
       "Hugh Dickins" <hugh@veritas.com>,
       "Alan Cox" <alan@lxorguk.ukuu.org.uk>,
       "Ulrich Drepper" <drepper@redhat.com>,
       "Andrew Morton" <akpm@linux-foundation.org>
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>> Sorry, no.
>> This description still doesn't explain why this interface is needed.
>>
>> The one of the points is this interface is used by another person or not.
>> You should explain how large this interface benefit has.
>>
>> Andi kleen explained this interface _can_  be used another one.
>> but nobody explain who use it actually.
>
> Anyone who doesn't want to use fixed addresses.

yup.
however, almost application doesn't use new flag because almost
application want to works on cross platform. (or merely lazy)
then, this explain isn't enough, imo.