linux-kernel - Re: [patch 1/2] mm, doc: cleanup and clarify munmap behavior for hugetlb memory

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Message-ID: <alpine.DEB.2.10.1503271833360.5628@chino.kir.corp.google.com>
Date:	Fri, 27 Mar 2015 18:37:46 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Eric B Munson <emunson@...mai.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Jonathan Corbet <corbet@....net>,
	Davide Libenzi <davidel@...ilserver.org>,
	Luiz Capitulino <lcapitulino@...hat.com>,
	Shuah Khan <shuahkh@....samsung.com>,
	Hugh Dickins <hughd@...gle.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Joern Engel <joern@...fs.org>,
	Jianguo Wu <wujianguo@...wei.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
	linux-doc@...r.kernel.org
Subject: Re: [patch 1/2] mm, doc: cleanup and clarify munmap behavior for
 hugetlb memory

On Fri, 27 Mar 2015, Eric B Munson wrote:

> > munmap(2) of hugetlb memory requires a length that is hugepage aligned,
> > otherwise it may fail.  Add this to the documentation.
> > 
> > This also cleans up the documentation and separates it into logical
> > units: one part refers to MAP_HUGETLB and another part refers to
> > requirements for shared memory segments.
> > 
> > Signed-off-by: David Rientjes <rientjes@...gle.com>
> > ---
> 
> If this is the route we are going to take, this behavoir needs to be
> called out prominently in the mmap/munmap man page.
> 

Yeah, that was my next step, but before we get mtk involved I was trying 
to get this merged since man2/mmap.2 already has a 
.I Documentation/vm/hugetlbpage.txt for MAP_HUGETLB so the man page patch 
can simply reference this addition to the file as justification.
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