From: Konstantin Khlebnikov <koct9i@gmail.com>
Date: Wed, 6 Aug 2014 23:06:34 +0000 (-0700)
Subject: shmem: update memory reservation on truncate
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~137^2~136
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=77142517990fd3d982678c2945ea2c4188ec5f9a;p=pandora-kernel.git

shmem: update memory reservation on truncate

A shared anonymous mapping created without MAP_NORESERVE holds memory
reservation for whole range of shmem segment.  Usually there is no way
to change its size, but /proc/<pid>/map_files/...  (available if
CONFIG_CHECKPOINT_RESTORE=y) allows that.

This patch adjusts the memory reservation in shmem_setattr().

Signed-off-by: Konstantin Khlebnikov <koct9i@gmail.com>
Acked-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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