ARC stable backport request for 4.4 and 4.2

From: Vineet Gupta
Date: Wed Jul 13 2016 - 16:46:01 EST


Could you please backport the following upstream commits for v4.4 and v4.2

4d0cb15fccd1db9 ("ARCv2: Check for LL-SC livelock only if LLSC is enabled")
b31ac42697bef4a ("ARCv2: LLSC: software backoff is NOT needed starting HS2.1c")