linux-kernel - Re: [PATCH v2 0/5] Support for generalized use of make C={1,2} via a wrapper program

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Date:   Mon, 18 Dec 2017 09:53:00 -0800
From:   Joe Perches <joe@...ches.com>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Knut Omang <knut.omang@...cle.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        linux-kernel@...r.kernel.org,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Nicolas Palix <nicolas.palix@...g.fr>,
        Jonathan Corbet <corbet@....net>,
        Santosh Shilimkar <santosh.shilimkar@...cle.com>,
        Matthew Wilcox <willy@...radead.org>, cocci@...teme.lip6.fr,
        rds-devel@....oracle.com, linux-rdma@...r.kernel.org,
        linux-doc@...r.kernel.org, Doug Ledford <dledford@...hat.com>,
        Mickaël Salaün <mic@...ikod.net>,
        Shuah Khan <shuah@...nel.org>, linux-kbuild@...r.kernel.org,
        Michal Marek <michal.lkml@...kovi.net>,
        Julia Lawall <Julia.Lawall@...6.fr>,
        John Haxby <john.haxby@...cle.com>,
        Åsmund Østvold <asmund.ostvold@...cle.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Kees Cook <keescook@...omium.org>, netdev@...r.kernel.org,
        Gilles Muller <Gilles.Muller@...6.fr>,
        "David S. Miller" <davem@...emloft.net>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Håkon Bugge <haakon.bugge@...cle.com>,
        Andy Whitcroft <apw@...onical.com>,
        "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com>
Subject: Re: [PATCH v2 0/5] Support for generalized use of make C={1,2} via
 a wrapper program

On Mon, 2017-12-18 at 10:46 -0700, Jason Gunthorpe wrote:
> On Sun, Dec 17, 2017 at 10:00:17PM -0800, Joe Perches wrote:
> 
> > > Today when we run checkers we get so many warnings it is too hard to
> > > make any sense of it.
> > 
> > Here is a list of the checkpatch messages for drivers/infiniband
> > sorted by type.
> > 
> > Many of these might be corrected by using
> > 
> > $ ./scripts/checkpatch.pl -f --fix-inplace --types=<TYPE> \
> >   $(git ls-files drivers/infiniband/)
> 
> How many of these do you think it is worth to fix?
> 
> We do get a steady trickle of changes in this topic every cycle.
> 
> Is it better to just do a big number of them all at once?

I think so.

> Do you have
> an idea how disruptive this kind of work is to the whole patch flow
> eg new patches no longer applying to for-next, backports no longer
> applying, merge conflicts?

Some do complain about backport patch purity.

I think that difficulty is overstated, but then
again, I don't do backports very often.

I think the best time for any rather wholesale
change is immediately after an rc-1 so overall
in-flight patch conflict volume is minimized.