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From: Vineet Gupta <Vineet.Gupta1@synopsys.com>
Subject: 4.2+ stable inclusion request: ARCv2: save r30 on kernel entry as gcc
 uses it for code-gen
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Date: Fri, 28 Apr 2017 11:57:36 -0700
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Hi,

Can we please backport upstream ecd43afdbe72017aefe48080631eb625e177ef4d ("ARCv2:
save r30 on kernel entry as gcc uses it for code-gen") to 4.2 to 4.9 kernels.

While the issue cites gcc, it is general deficiency of kernel as userspace
programs can modify r30 register in hand/inline assembly and those will not be
preserved without this change.

Thx,
-Vineet