linux-kernel - Re: [PATCH RFC V2] coccinelle: flag constants being passed for jiffies

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Date:	Sun, 14 Jun 2015 09:34:35 +0200
From:	Nicholas Mc Guire <der.herr@...r.at>
To:	Julia Lawall <julia.lawall@...6.fr>
Cc:	Nicholas Mc Guire <hofrat@...dl.org>,
	Gilles Muller <Gilles.Muller@...6.fr>,
	Nicolas Palix <nicolas.palix@...g.fr>,
	Michal Marek <mmarek@...e.cz>, Joe Perches <joe@...ches.com>,
	Andy Whitcroft <apw@...onical.com>,
	John Stultz <john.stultz@...aro.org>, cocci@...teme.lip6.fr,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC V2] coccinelle: flag constants being passed for
	jiffies

On Sun, 14 Jun 2015, Julia Lawall wrote:

> > +@...ipt:python depends on report@
> > +p << cc.p;
> > +timeout << cc.C;
> > +@@
> > +
> > +if str.isdigit(timeout):
> > +   if (int(timeout) != 1):
> > +      msg = "WARNING: timeout (%s) seems HZ dependent" % (timeout)
> > +      coccilib.report.print_report(p[0], msg)
> 
> The parentheses in the warning messages around the timeouts seem a little
> strange to me.
>

should be \"%s\" I guess - will fix that and the other findings - just waiting
for feedback if it makes any sense at all to include something like this.
 
> Otherwise, as a semantic patch, it looks fine.  I can't judge the problem 
> being solved though.
>
it found aproximately 30 cases in the kernel some of which have been fixed
already and none seem to be false postitives - the hardcoded "2"
really being the only open issue if those should be counted as false-postitives
and filtered.

I'm not aware of any case in the kernel where the passing of a jiffies value
is intentionally HZ dependent - so I guess atleast warning on this
makes sense.

Anyway it might also make more sense to put something like this
into one of the build-bots rather than push it into mainline for general
use.

thx!
hofrat
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