Re: [PATCH v4 4/5] arm64/perf: Enable PMCR long cycle counter bit

[David Daney]

On 02/18/2016 09:34 AM, Will Deacon wrote:
> On Thu, Feb 18, 2016 at 05:50:13PM +0100, Jan Glauber wrote:
> > With the long cycle counter bit (LC) disabled the cycle counter is not
> > working on ThunderX SOC (ThunderX only implements Aarch64).
> > Also, according to documentation LC == 0 is deprecated.
> >
> > To keep the code simple the patch does not introduce 64 bit wide counter
> > functions. Instead writing the cycle counter always sets the upper
> > 32 bits so overflow interrupts are generated as before.
> >
> > Original patch from Andrew Pinksi <Andrew.Pinksi@xxxxxxxxxxxxxxxxxx>
>
> What does this mean? Do we need Andrew's S-o-B, or is this a fresh patch?

I don't believe we need Andrew's S-o-B as the assertion of the 
Developer's Certificate of Origin 1.1 clauses (a), (b) and (d) is being 
made.  Specifically, clause (c) does not apply.

However this may be a gray area, so we could put on Andrew's S-o-B if 
that would make everybody happier.

David Daney


> Will
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel