linux-kernel - Re: 4.2+ stable inclusion request: ARCv2: save r30 on kernel entry as gcc uses it for code-gen

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Message-ID: <20170430140855.GA11186@kroah.com>
Date:   Sun, 30 Apr 2017 16:08:55 +0200
From:   Greg KH <greg@...ah.com>
To:     Vineet Gupta <Vineet.Gupta1@...opsys.com>
Cc:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        arcml <linux-snps-arc@...ts.infradead.org>
Subject: Re: 4.2+ stable inclusion request: ARCv2: save r30 on kernel entry
 as gcc uses it for code-gen

On Fri, Apr 28, 2017 at 11:57:36AM -0700, Vineet Gupta wrote:
> 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.

Queued up for 4.9 and 4.4 stable trees, thanks.

greg k-h