ARC stable backport for 3.14 and earlier

From: Vineet Gupta
Date: Thu May 07 2015 - 02:02:14 EST


Hi Greg,

Upstream commit e4140819dadc3624accac8294881bca8a3cba4ed, "ARC: signal handling
robustify" was marked for stable inclusion. It made it into 3.18 but not earlier
likely due to interim changes preventing a clean merge.

Could you please queue up the fixed up patch below for 3.14 and earlier friends...

Thx,
-Vineet

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