linux-kernel - Re: [PATCH 05/86] x86/gart: use uapi/linux/pci

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Message-ID: <20150331095106.GA19837@gmail.com>
Date:	Tue, 31 Mar 2015 11:51:06 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH 05/86] x86/gart: use uapi/linux/pci_ids.h directly


* Michael S. Tsirkin <mst@...hat.com> wrote:

> On Tue, Mar 31, 2015 at 10:34:45AM +0200, Ingo Molnar wrote:
> > 
> > * Michael S. Tsirkin <mst@...hat.com> wrote:
> > 
> > > On Mon, Mar 30, 2015 at 07:29:36AM +0200, Ingo Molnar wrote:
> > > > 
> > > > * Michael S. Tsirkin <mst@...hat.com> wrote:
> > > > 
> > > > > Header moved from linux/pci_ids.h to uapi/linux/pci_ids.h,
> > > > > use the new header directly so we can drop
> > > > > the wrapper in include/linux/pci_ids.h.
> > > > > 
> > > > > Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> > > > > ---
> > > > >  arch/x86/kernel/aperture_64.c | 2 +-
> > > > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > > > 
> > > > > diff --git a/arch/x86/kernel/aperture_64.c b/arch/x86/kernel/aperture_64.c
> > > > > index 76164e1..3b52a56 100644
> > > > > --- a/arch/x86/kernel/aperture_64.c
> > > > > +++ b/arch/x86/kernel/aperture_64.c
> > > > > @@ -17,7 +17,7 @@
> > > > >  #include <linux/init.h>
> > > > >  #include <linux/memblock.h>
> > > > >  #include <linux/mmzone.h>
> > > > > -#include <linux/pci_ids.h>
> > > > > +#include <uapi/linux/pci_ids.h>
> > > > >  #include <linux/pci.h>
> > > > >  #include <linux/bitops.h>
> > > > >  #include <linux/suspend.h>
> > > > > -- 
> > > > > MST
> > > > > 
> > > > 
> > > > NAK, it's absolutely ridiculous to send a 86 patches series for a 
> > > > trivial change like this!
> > > > 
> > > > Just do the rename in a single patch and avoid the churn. Even if 
> > > > there are conflicts, they are utmost trivial to fix up.
> > > > 
> > > > In fact the usual way to do such renames is to wait until the end of 
> > > > -rc1, auto-generate it and send Linus the core patch with the trivial 
> > > > renames straight away.
> > > > 
> > > > Thanks,
> > > > 
> > > > 	Ingo
> > > 
> > > 
> > > Unfortunately, vger mailing lists reject any email with more than 2k of
> > > email headers.  This means if I do what you suggest I can't Cc all
> > > maintainers for all affected files. [...]
> > 
> > You can Cc: linux-arch and lkml for tree-wide changes.
> > 
> > Also, since it's mostly trivial, there shouldn't be much (if any) 
> > controversy about it, right?
> 
> I thought so, too. However, I was just proven wrong and the patchset 
> was nacked. [...]

Well, I only NAK-ed its high-churn presentation, not the essence of it 
which looks good to me.

> [...] Would relevant people notice it if it's just linux-arch? IIUC 
> most people don't read lkml.  I guess Linus would notice and reject 
> it.

Just keep it in a clean, separate topic branch and point it out in the 
pull request - there's no reason to reject good changes, plus with 
this structure:

> > > [...]  I could just Cc all mailing lists I guess, but I really 
> > > wasn't sure about some parts of the change, deferring it until end 
> > > of -rc1 wouldn't be appropriate in this case, would it?
> > 
> > So since 90% of the patches are just a trivial:
> > 
> >   -#include <linux/pci_ids.h>
> >   +#include <uapi/linux/pci_ids.h>
> > 
> > you can auto-generate that simple rename and file movement into a 
> > single commit, at the end of -rc1, without affecting anyone, via 
> > something like:
> > 
> >   sed -i 's/linux\/pci_ids.h/uapi\/linux\/pci_ids.h/g' $(git grep -l linux/pci_ids.h)
> >   git mv include/linux/pci_ids.h include/uapi/linux/pci_ids.h
> >   git commit -a
> > 
> > (totally untested)
> > 
> > This should just work.
> >
> > Any other changes, as the removal of inclusions from files that 
> > apparently don't need it, or cleanups like the changing of the guard 
> > defines in pci_id.h, can be done on top of that - on a one patch per 
> > change basis.
> > 
> > This should drastically remove the churn.

it's trivially correct.

I just tried the untested script above and it generates a commit and a 
kernel that builds just fine.

So with that structure my high-churn complaint gets addressed and my 
NAK turns into:

  Acked-by: Ingo Molnar <mingo@...nel.org>

Thanks,

	Ingo
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