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Date: Thu, 22 Dec 2011 12:41:46 -0500
From: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
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To: Naotaka Hamaguchi <n.hamaguchi@jp.fujitsu.com>
CC: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH] mm: mmap system call does not return EOVERFLOW
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> The argument "offset" is shifted right by PAGE_SHIFT bits
> in sys_mmap(mmap systemcall).
> 
> ------------------------------------------------------------------------
> sys_mmap(unsigned long addr, unsigned long len,
> 	unsigned long prot, unsigned long flags,
> 	unsigned long fd, unsigned long off)
> {
> 	error = sys_mmap_pgoff(addr, len, prot, flags, fd, off>>  PAGE_SHIFT);
> }
> ------------------------------------------------------------------------

Hm.
Which version are you looking at? Current code seems to don't have
sys_mmap().