Message-ID: <alpine.DEB.2.20.1710052141201.2626@hadrien>
Date:   Thu, 5 Oct 2017 21:41:43 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Liam Breck <liam@...workimprov.net>
cc:     Sebastian Reichel <sebastian.reichel@...labora.co.uk>,
        Pali Rohár <pali.rohar@...il.com>,
        Linux PM mailing list <linux-pm@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        Gilles Muller <Gilles.Muller@...6.fr>,
        Nicolas Palix <nicolas.palix@...g.fr>, cocci@...teme.lip6.fr,
        linux-kernel <linux-kernel@...r.kernel.org>,
        kbuild test robot <fengguang.wu@...el.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>
Subject: Re: [PATCH] coccinelle: api: detect duplicate chip data arrays



On Thu, 5 Oct 2017, Liam Breck wrote:

> Hi Julia,
>
> On Thu, Oct 5, 2017 at 12:25 PM, Julia Lawall <julia.lawall@...6.fr> wrote:
> >
> >
> > On Thu, 5 Oct 2017, Liam Breck wrote:
> >
> >> Hi, sorry for slow reply...
> >>
> >> Can we patch something to make this script run by default on
> >> bq7xxxx_battery_i2c build? If so let's do that.
> >
> > I don't think anything is set up for that.  But any changes to the file
> > should be checked by the 0-day bot.
>
> How do we ask the 0-day bot team to configure their build to run this
> script? Will they just pick it up?
>
> >> Also maybe the name of the script should include "bq27xxx_data"?
> >
> > OK
> >
> >> Few more comments below...
> >>
> >> On Sun, Oct 1, 2017 at 5:42 AM, Julia Lawall <Julia.Lawall@...6.fr> wrote:
> >> > This semantic patch detects duplicate arrays declared using BQ27XXX_DATA
> >> > within a single structure.  It is currently specific to the file
> >> > drivers/power/supply/bq27xxx_battery.c.
> >> >
> >> > Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
> >> >
> >> > ---
> >> >  scripts/coccinelle/api/battery.cocci |  161 +++++++++++++++++++++++++++++++++++
> >> >  1 file changed, 161 insertions(+)
> >> >
> >> > diff --git a/scripts/coccinelle/api/battery.cocci b/scripts/coccinelle/api/battery.cocci
> >> > new file mode 100644
> >> > index 0000000..77c145a
> >> > --- /dev/null
> >> > +++ b/scripts/coccinelle/api/battery.cocci
> >> > @@ -0,0 +1,161 @@
> >> > +/// Detect BQ27XXX_DATA structures with identical registers, dm registers or
> >> > +/// properties.
> >> > +//# Doesn't unfold macros used in register or property fields.
> >> > +//# Requires OCaml scripting
> >> > +///
> >> > +// Confidence: High
> >> > +// Copyright: (C) 2017 Julia Lawall, Inria/LIP6, GPLv2.
> >> > +// URL: http://coccinelle.lip6.fr/
> >> > +// Requires: 1.0.7
> >> > +// Keywords: BQ27XXX_DATA
> >> > +
> >> > +virtual report
> >> > +
> >> > +@...tialize:ocaml@
> >> > +@@
> >> > +
> >> > +let print_report p msg =
> >> > +  let p = List.hd p in
> >> > +  Printf.printf "%s:%d:%d-%d: %s" p.file p.line p.col p.col_end msg
> >> > +
> >> > +@str depends on report@
> >> > +type t;
> >> > +identifier i,i1,i2;
> >> > +expression e1,e2;
> >> > +@@
> >> > +
> >> > +t i[] = {
> >> > +  ...,
> >> > +  [e1] = BQ27XXX_DATA(i1,...),
> >> > +  ...,
> >> > +  [e2] = BQ27XXX_DATA(i2,...),
> >> > +  ...,
> >> > +};
> >> > +
> >> > +@...ipt:ocaml tocheck@
> >> > +i1 << str.i1;
> >> > +i2 << str.i2;
> >> > +i1regs; i2regs;
> >> > +i1dmregs; i2dmregs;
> >> > +i1props; i2props;
> >> > +@@
> >> > +
> >> > +if not(i1 = i2)
> >> > +then
> >> > +  begin
> >> > +    i1regs := make_ident (i1 ^ "_regs");
> >> > +    i2regs := make_ident (i2 ^ "_regs");
> >> > +    i1dmregs := make_ident (i1 ^ "_dm_regs");
> >> > +    i2dmregs := make_ident (i2 ^ "_dm_regs");
> >> > +    i1props := make_ident (i1 ^ "_props");
> >> > +    i2props := make_ident (i2 ^ "_props")
> >> > +  end
> >> > +
> >> > +(* ---------------------------------------------------------------- *)
> >> > +
> >> > +@...regs1@
> >> > +typedef u8;
> >> > +identifier tocheck.i1regs;
> >> > +initializer list i1regs_vals;
> >> > +position p1;
> >> > +@@
> >> > +
> >> > +u8 i1regs@p1[...] = { i1regs_vals, };
> >> > +
> >> > +@...regs2@
> >> > +identifier tocheck.i2regs;
> >> > +initializer list i2regs_vals;
> >> > +position p2;
> >> > +@@
> >> > +
> >> > +u8 i2regs@p2[...] = { i2regs_vals, };
> >> > +
> >> > +@...ipt:ocaml@
> >> > +(_,i1regs_vals) << getregs1.i1regs_vals;
> >> > +(_,i2regs_vals) << getregs2.i2regs_vals;
> >> > +i1regs << tocheck.i1regs;
> >> > +i2regs << tocheck.i2regs;
> >> > +p1 << getregs1.p1;
> >> > +p2 << getregs2.p2;
> >> > +@@
> >> > +
> >> > +if i1regs < i2regs &&
> >> > +   List.sort compare i1regs_vals = List.sort compare i2regs_vals
> >> > +then
> >> > +  let msg =
> >> > +    Printf.sprintf
> >> > +      "WARNING %s and %s (line %d) have the same registers\n"
> >>
> >> "are identical" vs "have the same..."
> >
> > OK, I guess identical would be appropriate for regsand dm_regs, but
> > perhaps not for properties because there the same values might be in a
> > different order.
>
> The order of the properties has no impact, so a duplicate is
> functionally identical.

If you prefer identical, I can put that.

julia


>
> >
> > julia
> >
> >> > +      i1regs i2regs (List.hd p2).line in
> >> > +  print_report p1 msg
> >> > +
> >> > +(* ---------------------------------------------------------------- *)
> >> > +
> >> > +@...dmregs1@
> >> > +identifier tocheck.i1dmregs;
> >> > +initializer list i1dmregs_vals;
> >> > +position p1;
> >> > +@@
> >> > +
> >> > +struct bq27xxx_dm_reg i1dmregs@p1[] = { i1dmregs_vals, };
> >> > +
> >> > +@...dmregs2@
> >> > +identifier tocheck.i2dmregs;
> >> > +initializer list i2dmregs_vals;
> >> > +position p2;
> >> > +@@
> >> > +
> >> > +struct bq27xxx_dm_reg i2dmregs@p2[] = { i2dmregs_vals, };
> >> > +
> >> > +@...ipt:ocaml@
> >> > +(_,i1dmregs_vals) << getdmregs1.i1dmregs_vals;
> >> > +(_,i2dmregs_vals) << getdmregs2.i2dmregs_vals;
> >> > +i1dmregs << tocheck.i1dmregs;
> >> > +i2dmregs << tocheck.i2dmregs;
> >> > +p1 << getdmregs1.p1;
> >> > +p2 << getdmregs2.p2;
> >> > +@@
> >> > +
> >> > +if i1dmregs < i2dmregs &&
> >> > +   List.sort compare i1dmregs_vals = List.sort compare i2dmregs_vals
> >> > +then
> >> > +  let msg =
> >> > +    Printf.sprintf
> >> > +      "WARNING %s and %s (line %d) have the same dm registers\n"
> >>
> >> "are identical" vs "have the same..."
> >>
> >> > +      i1dmregs i2dmregs (List.hd p2).line in
> >> > +  print_report p1 msg
> >> > +
> >> > +(* ---------------------------------------------------------------- *)
> >> > +
> >> > +@...props1@
> >> > +identifier tocheck.i1props;
> >> > +initializer list[n1] i1props_vals;
> >> > +position p1;
> >> > +@@
> >> > +
> >> > +enum power_supply_property i1props@p1[] = { i1props_vals, };
> >> > +
> >> > +@...props2@
> >> > +identifier tocheck.i2props;
> >> > +initializer list[n2] i2props_vals;
> >> > +position p2;
> >> > +@@
> >> > +
> >> > +enum power_supply_property i2props@p2[] = { i2props_vals, };
> >> > +
> >> > +@...ipt:ocaml@
> >> > +(_,i1props_vals) << getprops1.i1props_vals;
> >> > +(_,i2props_vals) << getprops2.i2props_vals;
> >> > +i1props << tocheck.i1props;
> >> > +i2props << tocheck.i2props;
> >> > +p1 << getprops1.p1;
> >> > +p2 << getprops2.p2;
> >> > +@@
> >> > +
> >> > +if i1props < i2props &&
> >> > +   List.sort compare i1props_vals = List.sort compare i2props_vals
> >> > +then
> >> > +  let msg =
> >> > +    Printf.sprintf
> >> > +      "WARNING %s and %s (line %d) have the same properties\n"
> >>
> >> "are identical" vs "have the same..."
> >>
> >>
> >> > +      i1props i2props (List.hd p2).line in
> >> > +  print_report p1 msg
> >> >
> >> --
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> >>
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