linux-kernel - RE: [PATCH] Coccinelle: add atomic_as

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Date:   Wed, 30 Aug 2017 15:06:22 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     "Reshetova, Elena" <elena.reshetova@...el.com>
cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "cocci@...teme.lip6.fr" <cocci@...teme.lip6.fr>,
        Gilles Muller <Gilles.Muller@...6.fr>,
        "nicolas.palix@...g.fr" <nicolas.palix@...g.fr>,
        "mmarek@...e.com" <mmarek@...e.com>,
        "keescook@...omium.org" <keescook@...omium.org>,
        "ishkamiel@...il.com" <ishkamiel@...il.com>
Subject: RE: [PATCH] Coccinelle: add atomic_as_refcounter script



On Wed, 30 Aug 2017, Reshetova, Elena wrote:

>
> >
> > On Wed, 30 Aug 2017, Elena Reshetova wrote:
> >
> > > atomic_as_refcounter.cocci script allows detecting
> > > cases when refcount_t type and API should be used
> > > instead of atomic_t.
> > >
> > > Signed-off-by: Elena Reshetova <elena.reshetova@...el.com>
> >
> > Acked-by: Julia Lawall <julia.lawall@...6.fr>
>
> Thank you very much Julia! What is the correct path to merge this?
> I will resend with your acked-by, but what is the tree that should merge it?

Marek will take it.  If you want to resend, please get rid of the
metavariable y in the rule r1. It causes an unused variable warning.

julia

>
> Best Regards,
> Elena.
> >
> > > ---
> > >  scripts/coccinelle/api/atomic_as_refcounter.cocci | 131
> > ++++++++++++++++++++++
> > >  1 file changed, 131 insertions(+)
> > >  create mode 100644 scripts/coccinelle/api/atomic_as_refcounter.cocci
> > >
> > > diff --git a/scripts/coccinelle/api/atomic_as_refcounter.cocci
> > b/scripts/coccinelle/api/atomic_as_refcounter.cocci
> > > new file mode 100644
> > > index 0000000..f83771b
> > > --- /dev/null
> > > +++ b/scripts/coccinelle/api/atomic_as_refcounter.cocci
> > > @@ -0,0 +1,131 @@
> > > +// Check if refcount_t type and API should be used
> > > +// instead of atomic_t type when dealing with refcounters
> > > +//
> > > +// Copyright (c) 2016-2017, Elena Reshetova, Intel Corporation
> > > +//
> > > +// Confidence: Moderate
> > > +// URL: http://coccinelle.lip6.fr/
> > > +// Options: --include-headers --very-quiet
> > > +
> > > +virtual report
> > > +
> > > +@r1 exists@
> > > +identifier a, x, y;
> > > +position p1, p2;
> > > +identifier fname =~ ".*free.*";
> > > +identifier fname2 =~ ".*destroy.*";
> > > +identifier fname3 =~ ".*del.*";
> > > +identifier fname4 =~ ".*queue_work.*";
> > > +identifier fname5 =~ ".*schedule_work.*";
> > > +identifier fname6 =~ ".*call_rcu.*";
> > > +
> > > +@@
> > > +
> > > +(
> > > + atomic_dec_and_test@p1(&(a)->x)
> > > +|
> > > + atomic_dec_and_lock@p1(&(a)->x, ...)
> > > +|
> > > + atomic_long_dec_and_lock@p1(&(a)->x, ...)
> > > +|
> > > + atomic_long_dec_and_test@p1(&(a)->x)
> > > +|
> > > + atomic64_dec_and_test@p1(&(a)->x)
> > > +|
> > > + local_dec_and_test@p1(&(a)->x)
> > > +)
> > > +...
> > > +(
> > > + fname@p2(a, ...);
> > > +|
> > > + fname2@p2(...);
> > > +|
> > > + fname3@p2(...);
> > > +|
> > > + fname4@p2(...);
> > > +|
> > > + fname5@p2(...);
> > > +|
> > > + fname6@p2(...);
> > > +)
> > > +
> > > +
> > > +@...ipt:python depends on report@
> > > +p1 << r1.p1;
> > > +p2 << r1.p2;
> > > +@@
> > > +msg = "atomic_dec_and_test variation before object free at line %s."
> > > +coccilib.report.print_report(p1[0], msg % (p2[0].line))
> > > +
> > > +@r4 exists@
> > > +identifier a, x, y;
> > > +position p1, p2;
> > > +identifier fname =~ ".*free.*";
> > > +
> > > +@@
> > > +
> > > +(
> > > + atomic_dec_and_test@p1(&(a)->x)
> > > +|
> > > + atomic_dec_and_lock@p1(&(a)->x, ...)
> > > +|
> > > + atomic_long_dec_and_lock@p1(&(a)->x, ...)
> > > +|
> > > + atomic_long_dec_and_test@p1(&(a)->x)
> > > +|
> > > + atomic64_dec_and_test@p1(&(a)->x)
> > > +|
> > > + local_dec_and_test@p1(&(a)->x)
> > > +)
> > > +...
> > > +y=a
> > > +...
> > > +fname@p2(y, ...);
> > > +
> > > +
> > > +@...ipt:python depends on report@
> > > +p1 << r4.p1;
> > > +p2 << r4.p2;
> > > +@@
> > > +msg = "atomic_dec_and_test variation before object free at line %s."
> > > +coccilib.report.print_report(p1[0], msg % (p2[0].line))
> > > +
> > > +@r2 exists@
> > > +identifier a, x;
> > > +position p1;
> > > +@@
> > > +
> > > +(
> > > +atomic_add_unless(&(a)->x,-1,1)@p1
> > > +|
> > > +atomic_long_add_unless(&(a)->x,-1,1)@p1
> > > +|
> > > +atomic64_add_unless(&(a)->x,-1,1)@p1
> > > +)
> > > +
> > > +@...ipt:python depends on report@
> > > +p1 << r2.p1;
> > > +@@
> > > +msg = "atomic_add_unless"
> > > +coccilib.report.print_report(p1[0], msg)
> > > +
> > > +@r3 exists@
> > > +identifier x;
> > > +position p1;
> > > +@@
> > > +
> > > +(
> > > +x = atomic_add_return@p1(-1, ...);
> > > +|
> > > +x = atomic_long_add_return@p1(-1, ...);
> > > +|
> > > +x = atomic64_add_return@p1(-1, ...);
> > > +)
> > > +
> > > +@...ipt:python depends on report@
> > > +p1 << r3.p1;
> > > +@@
> > > +msg = "x = atomic_add_return(-1, ...)"
> > > +coccilib.report.print_report(p1[0], msg)
> > > +
> > > +
> > > --
> > > 2.7.4
> > >
> > >
>