From e37609bb36f706c954e82e580e2e790e9d5caef8 Mon Sep 17 00:00:00 2001
From: Piotr Kwapulinski <kwapulinski.piotr@gmail.com>
Date: Wed, 24 Jun 2015 16:58:39 -0700
Subject: [PATCH] mm/mmap.c: optimization of do_mmap_pgoff function

The simple check for zero length memory mapping may be performed
earlier.  So that in case of zero length memory mapping some unnecessary
code is not executed at all.  It does not make the code less readable
and saves some CPU cycles.

Signed-off-by: Piotr Kwapulinski <kwapulinski.piotr@gmail.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
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