linux-kernel - Re: [PATCH 4/4] mremap: simplify the "overlap" check in mremap

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Message-ID: <alpine.DEB.2.10.1506301545170.24266@chino.kir.corp.google.com>
Date:	Tue, 30 Jun 2015 15:45:48 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Oleg Nesterov <oleg@...hat.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Benjamin LaHaise <bcrl@...ck.org>,
	Hugh Dickins <hughd@...gle.com>,
	Jeff Moyer <jmoyer@...hat.com>,
	Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] mremap: simplify the "overlap" check in
 mremap_to()

On Sat, 20 Jun 2015, Oleg Nesterov wrote:

> Minor, but this check is overcomplicated. Two half-intervals do NOT
> overlap if END1 <= START2 || END2 <= START1, mremap_to() just needs
> to negate this check.
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>

Acked-by: David Rientjes <rientjes@...gle.com>

If you rebase this patchset, it would be good to fixup the comment style 
while you're there.
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