linux-kernel - Re: [sparc64] enabling CONFIG_PROVE_LOCKING makes kernel unable to build

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Date:   Mon, 10 Aug 2020 13:16:44 +0200
From:   peterz@...radead.org
To:     Anatoly Pugachev <matorola@...il.com>
Cc:     Sparc kernel list <sparclinux@...r.kernel.org>,
        Linux Kernel list <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: [sparc64] enabling CONFIG_PROVE_LOCKING makes kernel unable to
 build

On Mon, Aug 10, 2020 at 12:23:48PM +0300, Anatoly Pugachev wrote:
> On Tue, Aug 4, 2020 at 4:34 PM <peterz@...radead.org> wrote:
> >
> > On Tue, Aug 04, 2020 at 04:17:16PM +0300, Anatoly Pugachev wrote:
> > > Hello!
> > >
> > > Linus git master sources:
> > >
> > > $ git desc
> > > v5.8-2483-gc0842fbc1b18
> > >
> >
> > Ooh, it looks like that series wasn't cut back far enough :/
> >
> > 859247d39fb0 ("seqlock: lockdep assert non-preemptibility on seqcount_t
> > write") does indeed also introduce problems.
> >
> > I've been working on untangling the header mess for the full series and
> > the below patch is what I currently have.
> >
> > ---
> > Subject: seqlock,headers: Untangle the spaghetti monster
> > From: Peter Zijlstra <peterz@...radead.org>
> > Date: Thu Jul 30 13:20:47 CEST 2020
> >
> > By using lockdep_assert_*() from seqlock.h, the spaghetti monster
> > attacked.
> 
> Thanks Peter!
> 
> It doesn't apply cleanly over master git, but it least makes kernel
> compilable / bootable on sparc64:

  git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git locking/urgent

Should contain an updated version.