linux-kernel - Re: [PATCH] mm: move sys_mmap

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Date:	Mon, 4 Jan 2010 17:21:26 +0000 (GMT)
From:	Hugh Dickins <hugh.dickins@...cali.co.uk>
To:	Eric B Munson <ebmunson@...ibm.com>
cc:	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...IV.linux.org.uk>,
	David Howells <dhowells@...hat.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] mm: move sys_mmap_pgoff from util.c

On Mon, 4 Jan 2010, Eric B Munson wrote:
> On Wed, 30 Dec 2009, Hugh Dickins wrote:
> 
> > Move sys_mmap_pgoff() from mm/util.c to mm/mmap.c and mm/nommu.c,
> > where we'd expect to find such code: especially now that it contains
> > the MAP_HUGETLB handling.  Revert mm/util.c to how it was in 2.6.32.
> > 
> > This patch just ignores MAP_HUGETLB in the nommu case, as in 2.6.32,
> > whereas 2.6.33-rc2 reported -ENOSYS.  Perhaps validate_mmap_request()
> > should reject it with -EINVAL?  Add that later if necessary.
> > 
> > Signed-off-by: Hugh Dickins <hugh.dickins@...cali.co.uk>
> 
> I think that -ENOSYS is the correcet response in the nommu case, but
> I that can be added in a later patch.
> 
> Acked-by: Eric B Munson <ebmunson@...ibm.com>

Thanks.  I had believed -ENOSYS was solely for unsupported system calls,
so thought it inappropriate here; but we seem to have quite a few places
which are using it indeed for "Function not implemented", and -EINVAL is
always so very overloaded that an alternative can be a lot more helpful.
Okay, I'll send a patch to give -ENOSYS for MAP_HUGETLB on nommu, which
will be consistent with mmu.

Hugh
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