linux-kernel - Re: [PATCH 00/11] Lock warning cleanup

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Date:   Mon, 10 Feb 2020 23:09:59 +0000 (GMT)
From:   Jules Irenge <jbi.octave@...il.com>
To:     Boqun Feng <boqun.feng@...il.com>
cc:     Jules Irenge <jbi.octave@...il.com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, kasan-dev@...glegroups.com,
        akpm@...ux-foundation.org, dvyukov@...gle.com, glider@...gle.com,
        aryabinin@...tuozzo.com, bsegall@...gle.com, rostedt@...dmis.org,
        dietmar.eggemann@....com, vincent.guittot@...aro.org,
        juri.lelli@...hat.com, peterz@...radead.org, mingo@...hat.com,
        mgorman@...e.de, dvhart@...radead.org, tglx@...utronix.de,
        namhyung@...nel.org, jolsa@...hat.com,
        alexander.shishkin@...ux.intel.com, mark.rutland@....com,
        acme@...nel.org, viro@...iv.linux.org.uk,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 00/11] Lock warning cleanup



On Mon, 10 Feb 2020, Boqun Feng wrote:

> Hi Jules,
> 
> On Sun, Feb 09, 2020 at 10:24:42PM +0000, Jules Irenge wrote:
> > This patch series adds missing annotations to functions that register warnings of context imbalance when built with Sparse tool.
> > The adds fix the warnings and give insight on what the functions are actually doing.
> > 
> > 1. Within the futex subsystem, a __releases(&pi_state->.pi_mutex.wait_lock) is added because wake_futex_pi() only releases the lock at exit,
> > must_hold(q->lock_ptr) have been added to fixup_pi_state_owner() because the lock is held at entry and exit;
> > a __releases(&hb->lock) added to futex_wait_queue_me() as it only releases the lock.
> > 
> > 2. Within fs_pin, a __releases(RCU) is added because the function exit RCU critical section at exit.
> > 
> > 3. In kasan, an __acquires(&report_lock) has been added to start_report() and   __releases(&report_lock) to end_report() 
> > 
> > 4. Within ring_buffer subsystem, a __releases(RCU) has been added perf_output_end() 
> > 
> > 5. schedule subsystem recorded an addition of the __releases(rq->lock) annotation and a __must_hold(this_rq->lock)
> > 
> > 6. At hrtimer subsystem, __acquires(timer) is added  to lock_hrtimer_base() as the function acquire the lock but never releases it.
> > Jules Irenge (11):
> >   hrtimer: Add missing annotation to lock_hrtimer_base()
> >   futex: Add missing annotation for wake_futex_pi()
> >   futex: Add missing annotation for fixup_pi_state_owner()
> 
> Given that those three patches have been sent and reviewed, please do
> increase the version number (this time, for example, using v2) when
> sending the updated ones. Also please add a few sentences after the
> commit log describing what you have changed between versions.
> 
> Here is an example:
> 
> 	https://lore.kernel.org/lkml/20200124231834.63628-4-pmalani@chromium.org/
> 
> Regards,
> Boqun
> 
> >   perf/ring_buffer: Add missing annotation to perf_output_end()
> >   sched/fair: Add missing annotation for nohz_newidle_balance()
> >   sched/deadline: Add missing annotation for dl_task_offline_migration()
> >   fs_pin: Add missing annotation for pin_kill() declaration
> >   fs_pin: Add missing annotation for pin_kill() definition
> >   kasan: add missing annotation for start_report()
> >   kasan: add missing annotation for end_report()
> >   futex: Add missing annotation for futex_wait_queue_me()
> > 
> >  fs/fs_pin.c                 | 2 +-
> >  include/linux/fs_pin.h      | 2 +-
> >  kernel/events/ring_buffer.c | 2 +-
> >  kernel/futex.c              | 3 +++
> >  kernel/sched/deadline.c     | 1 +
> >  kernel/sched/fair.c         | 2 +-
> >  kernel/time/hrtimer.c       | 1 +
> >  mm/kasan/report.c           | 4 ++--
> >  8 files changed, 11 insertions(+), 6 deletions(-)
> > 
> > -- 
> > 2.24.1
> > 
> 

Thanks for the feedback, I take good notes. I am working on the 
second version.

Kind regards,
Jules