linux-kernel - Re: [Patch v4 01/12] microblaze: irqchip: Move intc driver to irqchip

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Date:   Fri, 2 Sep 2016 13:28:06 +0000
From:   Jason Cooper <jason@...edaemon.net>
To:     Michal Simek <michal.simek@...inx.com>
Cc:     Zubair Lutfullah Kakakhel <Zubair.Kakakhel@...tec.com>,
        monstr@...str.eu, ralf@...ux-mips.org, tglx@...utronix.de,
        marc.zyngier@....com, soren.brinkmann@...inx.com,
        linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org,
        netdev@...r.kernel.org
Subject: Re: [Patch v4 01/12] microblaze: irqchip: Move intc driver to irqchip

Hi Michal, Zubair,

On Fri, Sep 02, 2016 at 12:27:54PM +0200, Michal Simek wrote:
> On 2.9.2016 12:06, Zubair Lutfullah Kakakhel wrote:
> > On 09/02/2016 07:25 AM, Michal Simek wrote:
...
> >> Also there is another copy of this driver in the tree which was using
> >> old ppc405 and ppc440 xilinx platforms.
> >>
> >> arch/powerpc/include/asm/xilinx_intc.h
> >> arch/powerpc/sysdev/xilinx_intc.c
> >>
> >> These should be also removed by moving this driver to generic folder.
> > 
> > I didn't know about that drivers existence.
> > 
> > This patch series already touches microblaze, mips and irqchip.
> > Both microblaze and mips platforms using this driver are little-endian.
> 
> MB is big ending too and as you see there is big endian support in the
> driver already.
> 
> > 
> > Adding a big-endian powerpc driver + platform to the mix is going to
> > complicate the series further and make it super hard to synchronize
> > various subsystems, test stuff, and then move the drivers without
> > breakage.

The whole point of Linus' push to move drivers out of arch/ is to
reduce code duplication and create more robust drivers.

> > I'd highly recommend letting this move happen. And then the powerpc
> > driver can transition over time to this driver.

I've seen this argument before, and despite everyone's best intentions,
it never happens. :(

We have linux-next, 0-day and other resources to test these sorts of
changes and catch errors before they hit mainline.

Let's take our time and do it right.

thx,

Jason.