linux-kernel - 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
From:   Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     lkml <linux-kernel@...r.kernel.org>,
        arcml <linux-snps-arc@...ts.infradead.org>
Subject: 4.2+ stable inclusion request: ARCv2: save r30 on kernel entry as gcc
 uses it for code-gen

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