linux-kernel - Re: [PATCH 00/21] liblockdep fixes for v4.12

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Date:   Fri, 26 May 2017 10:57:53 +0000
From:   "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com>
To:     Ingo Molnar <mingo@...nel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "ben@...adent.org.uk" <ben@...adent.org.uk>,
        "a.p.zijlstra@...llo.nl" <a.p.zijlstra@...llo.nl>,
        "tglx@...utronix.de" <tglx@...utronix.de>
Subject: Re: [PATCH 00/21] liblockdep fixes for v4.12

On Fri, May 26, 2017 at 08:52:52AM +0200, Ingo Molnar wrote:
> 
> * Levin, Alexander (Sasha Levin) <alexander.levin@...izon.com> wrote:
> 
> >  MAINTAINERS                                    |   2 +-
> >  tools/Makefile                                 |   8 +++--
> >  tools/include/linux/bitops.h                   |  10 ++++++
> >  tools/include/linux/err.h                      |   5 +++
> >  tools/include/linux/jhash.h                    | 175 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> >  tools/include/linux/sched/clock.h              |   0
> >  tools/include/linux/sched/mm.h                 |   0
> >  tools/include/linux/sched/task.h               |   0
> >  tools/include/linux/unaligned/packed_struct.h  |  46 +++++++++++++++++++++++++++
> >  tools/lib/lockdep/Makefile                     |   9 +++---
> >  tools/lib/lockdep/lockdep.c                    |  17 ++++++++++
> >  tools/lib/lockdep/preload.c                    |   3 +-
> >  tools/lib/lockdep/run_tests.sh                 |   8 ++---
> >  tools/lib/lockdep/uinclude/linux/bitops.h      |   3 --
> >  tools/lib/lockdep/uinclude/linux/compiler.h    |   2 ++
> >  tools/lib/lockdep/uinclude/linux/debug_locks.h |   2 +-
> >  tools/lib/lockdep/uinclude/linux/irqflags.h    |   8 ++---
> >  tools/lib/lockdep/uinclude/linux/kallsyms.h    |   3 +-
> >  tools/lib/lockdep/uinclude/linux/kernel.h      |  20 ++++++++++--
> >  tools/lib/lockdep/uinclude/linux/lockdep.h     |  26 ++++++++--------
> >  tools/lib/lockdep/uinclude/linux/module.h      |   5 +++
> >  tools/lib/lockdep/uinclude/linux/rcu.h         |   2 ++
> >  22 files changed, 317 insertions(+), 37 deletions(-)
> >  create mode 100644 tools/include/linux/jhash.h
> >  create mode 100644 tools/include/linux/sched/clock.h
> >  create mode 100644 tools/include/linux/sched/mm.h
> >  create mode 100644 tools/include/linux/sched/task.h
> >  create mode 100644 tools/include/linux/unaligned/packed_struct.h
> >  delete mode 100644 tools/lib/lockdep/uinclude/linux/bitops.h
> 
> Yeah, so what needs to be fixed as well is for liblockdep to exclusively use 
> tools/include/ (and extend those headers where required).
> 
> perf already uses that method and it works well.
> 
> liblockdep already uses tools/include/ in part, but even after I apply all your 
> patches, there's still lib/lockdep/uinclude/ which appears to duplicate a number 
> of headers.
> 
> I did a quick check - for example WARN_ON() et al is duplicated in 
> tools/lib/lockdep/uinclude/linux/kernel.h.

Right, and as you can see from this patchset where we added to
tools/include/ when needed and removed from lib/lockdep/uinclude,
liblockdep is slowly creeping the "right" way.

perf, like liblockdep, didn't finish the switch to exclusively use
tools/include/ yet.

I can put more work into getting it done over the next few releases,
but it's not something I see as a critical fix for the upcoming
release.

-- 

Thanks,
Sasha