linux-kernel - Re: [PATCH v2] mmap.2: MAP_FIXED updated documentation

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Message-ID: <20171206100118.GA13979@rei>
Date:   Wed, 6 Dec 2017 11:01:18 +0100
From:   Cyril Hrubis <chrubis@...e.cz>
To:     John Hubbard <jhubbard@...dia.com>
Cc:     Michal Hocko <mhocko@...nel.org>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        linux-man <linux-man@...r.kernel.org>, linux-api@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>, linux-arch@...r.kernel.org,
        Jann Horn <jannh@...gle.com>,
        Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH v2] mmap.2: MAP_FIXED updated documentation

Hi!
> (It does seem unfortunate that the man page cannot help the programmer
> actually write correct code here. He or she is forced to read the kernel
> implementation, in order to figure out the true alignment rules. I was
> hoping we could avoid that.)

It would be nice if we had this information exported somehere so that we
do not have to rely on per-architecture ifdefs.

What about adding MapAligment or something similar to the /proc/meminfo?

-- 
Cyril Hrubis
chrubis@...e.cz