linux-kernel - Re: [PATCH 6/8] perf/arm-cmn: Refactor DTC PMU register access

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Message-ID: <ZsRgjV8vUQ6AuaLK@J2N7QTR9R3>
Date: Tue, 20 Aug 2024 10:23:25 +0100
From: Mark Rutland <mark.rutland@....com>
To: Robin Murphy <robin.murphy@....com>
Cc: will@...nel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, ilkka@...amperecomputing.com
Subject: Re: [PATCH 6/8] perf/arm-cmn: Refactor DTC PMU register access

On Mon, Aug 19, 2024 at 05:41:30PM +0100, Robin Murphy wrote:
> On 16/08/2024 11:29 am, Mark Rutland wrote:
> > On Fri, Aug 09, 2024 at 08:15:45PM +0100, Robin Murphy wrote:
> > > Annoyingly, we're soon going to have to cope with PMU registers moving
> > > about. This will mostly be straightforward, except for the hard-coding
> > > of CMN_PMU_OFFSET for the DTC PMU registers. As a first step, refactor
> > > those accessors to allow for encapsulating a variable offset without
> > > making a big mess all over.
> > > 
> > > Signed-off-by: Robin Murphy <robin.murphy@....com>
> > > ---
> > >   drivers/perf/arm-cmn.c | 64 ++++++++++++++++++++++++------------------
> > >   1 file changed, 36 insertions(+), 28 deletions(-)
> > 
> > Aside from a minoe comment below this looks fine to me.
> > 
> > >   struct arm_cmn_dtc {
> > >   	void __iomem *base;
> > > +	void __iomem *pmu_base;
> > >   	int irq;
> > > -	int irq_friend;
> > > +	s8 irq_friend;
> > 
> > Unrelated change?
> > 
> > AFAICT there's no reason for 'irq_friend' to change from 'int' to 's8',
> > and nothing in the commit message explains it.
> 
> Oops, I had meant to note in the commit message that this is a little
> structure repacking where there was a hole already, to compensate for adding
> the new member... I shall un-forget that for v2.

Cool, with that:

Acked-by: Mark Rutland <mark.rutland@....com>

Mark.