linux-kernel - Re: [PATCH 1/3] time: Add missing annotation to lock_hrtimer

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Date:   Sat, 25 Jan 2020 01:26:58 +0000 (GMT)
From:   Jules Irenge <jbi.octave@...il.com>
To:     Thomas Gleixner <tglx@...utronix.de>
cc:     Jules Irenge <jbi.octave@...il.com>, boqun.feng@...il.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] time: Add missing annotation to
 lock_hrtimer_base()


Thanks Thomas. I really appreciate your feedback, I take good note and I 
will send a different version with all the changes in reference to the 
email. 
 
Thanks again,
Kind regards
Jules

On Fri, 24 Jan 2020, Thomas Gleixner wrote:

> Jules,
> 
> Jules Irenge <jbi.octave@...il.com> writes:
> 
> Please use the proper subsystem prefixes when sending patches.
> 
> git log --oneline path/to/file
> 
> gives you usally a pretty good hint.
> 
> > Sparse reports a warning at lock_hrtimer_base()
> >
> > |warning: context imbalance in lock_hrtimer_base() - wrong count at exit
> 
> This leading '|' is pointless
> 
> > |warning: context imbalance in hrtimer_start_range_ns() - unexpected unlock
> > |warning: context imbalance in hrtimer_try_to_cancel() - unexpected unlock
> > |warning: context imbalance in __hrtimer_get_remaining()
> > |- unexpected unlock
> 
> How are the last 3 related to:
> 
> > Sparse reports a warning at lock_hrtimer_base()
> 
> ?
> 
> > To fix this , an __acquires(timer) annotation is added.
> 
>   Add the missing __acquires(timer) annotation.
> 
> Is precise and follows the recommendations of Documentation/process/...
> 
> > Given that lock_hrtimer_base() does actually call READ_ONCE(timer->base).
> 
> Given that the above sentence uses 'Given that' it should not terminate
> right after explaining the 'Given'.
> 
> > This not only fixes the warnings but also improves on readability of
> > the code.
> 
> I tend to disagree. In fact the annotation disturbes the reading flow
> because it's on a separate line.
> 
> Can you please stop using this boilerplate which is neither helping
> review nor giving someone who looks at the commit later on any useful
> information?
> 
> Here is a suggestion for a change log for this:
> 
>   Sparse reports several warnings;
>    warning: context imbalance in lock_hrtimer_base() - wrong count at exit
>    warning: context imbalance in hrtimer_start_range_ns() - unexpected unlock
>    warning: context imbalance in hrtimer_try_to_cancel() - unexpected unlock
>    warning: context imbalance in __hrtimer_get_remaining()- unexpected unlock
> 
>   The root cause is a missing annotation of lock_hrtimer_base() which
>   causes also the 'unexpected unlock' warnings.
>   
>   Add the missing __acquires(timer) annotation.
> 
> Hmm?
> 
> The other 2 patches of this series have similar issues. The futex
> changelog is also horribly formatted.
> 
> Thanks,
> 
>         tglx
>