Re: [Qemu-devel] [PATCH v5 00/24] ACPI reorganization for hardware-reduced API addition

[Samuel Ortiz <sameo@linux.intel.com>]

Igor,

On Wed, Nov 21, 2018 at 03:15:26PM +0100, Igor Mammedov wrote:
> On Wed, 21 Nov 2018 07:35:47 -0500
> "Michael S. Tsirkin" <mst@redhat.com> wrote:
> 
> > On Mon, Nov 19, 2018 at 04:31:10PM +0100, Igor Mammedov wrote:
> > > On Fri, 16 Nov 2018 17:37:54 +0100
> > > Paolo Bonzini <pbonzini@redhat.com> wrote:
> > >   
> > > > On 16/11/18 17:29, Igor Mammedov wrote:  
> > > > > General suggestions for this series:
> > > > >   1. Preferably don't do multiple changes within a patch
> > > > >      neither post huge patches (unless it's pure code movement).
> > > > >      (it's easy to squash patches later it necessary)
> > > > >   2. Start small, pick a table generalize it and send as
> > > > >      one small patchset. Tables are often independent
> > > > >      and it's much easier on both author/reviewer to agree upon
> > > > >      changes and rewrite it if necessary.    
> > > > 
> > > > How would that be done?  This series is on the bigger side, agreed, but
> > > > most of it is really just code movement.  It's a starting point, having
> > > > a generic ACPI library is way beyond what this is trying to do.  
> > > I've tried to give suggestions how to restructure series
> > > on per patch basis. In my opinion it quite possible to split
> > > series in several smaller ones and it should really help with
> > > making series cleaner and easier/faster to review/amend/merge
> > > vs what we have in v5.
> > > (it's more frustrating to rework large series vs smaller one)
> > > 
> > > If something isn't clear, it's easy to reach out to me here
> > > or directly (email/irc/github) for clarification/feed back.  
> > 
> > I assume the #1 goal is to add reduced HW support.  So another
> > option to speed up merging is to just go ahead and duplicate a
> > bunch of code e.g. in pc_virt.c acpi/reduced.c or in any other
> > file.
> > This way it might be easier to see what's common code and what isn't.
> > And I think offline Igor said he might prefer that way. Right Igor?
> You mean probably 'x86 reduced hw' support. That's was what I've
> already suggested for PCI AML code during patch review. Just don't
> call it generic when it's not and place code in hw/i386/ directory beside
> acpi-build.c. It might apply to some other tables (i.e. complex cases).
> 
> On per patch review I gave suggestions how to amend series to make
> it acceptable without doing complex refactoring and pointed out
> places we probably shouldn't refactor now and just duplicate as
> it's too complex or not clear how to generalize it yet.
> 
> Problem with duplication is that a random contributor is not
> around to clean code up after a feature is merged and we end up
> with a bunch of messy code.
> 
> A word to the contributors,
> Don't do refactoring in silence, keep discussing approaches here,
> suggest alternatives. That way it's easier to reach a compromise
> and merge it with less iterations. And if you do split it in smaller
> parts, the process should go even faster.
> 
> I'll sent a small RSDP refactoring series for reference.
I was already working on the RSDP changes. Let me know if I should drop
that work too.

Cheers,
Samuel.