linux-kernel - Re: [PATCH] checkpatch: Test for kmalloc/memset(0) pairs

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Message-ID: <8762r8mt0h.fsf@linux.vnet.ibm.com>
Date:	Thu, 24 Mar 2011 21:04:54 +0530
From:	"Aneesh Kumar K. V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Julia Lawall <julia@...u.dk>, Pekka Enberg <penberg@...nel.org>
Cc:	Américo Wang <xiyou.wangcong@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Jonathan Corbet <corbet@....net>,
	LKML <linux-kernel@...r.kernel.org>,
	Andy Whitcroft <apw@...dowen.org>,
	Dave Jones <davej@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Nicolas Palix <npalix@...u.dk>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] checkpatch: Test for kmalloc/memset(0) pairs

On Sun, 20 Mar 2011 10:17:07 +0100 (CET), Julia Lawall <julia@...u.dk> wrote:
> On Sun, 20 Mar 2011, Pekka Enberg wrote:
> 
> > Hi Julia,
> > 
> > On Sun, Mar 20, 2011 at 10:01 AM, Julia Lawall <julia@...u.dk> wrote:
> > > Suggestions for how to make it easier to use or the documentation more
> > > understandable are welcome.
> > 
> > The benefit of scripts/checkpatch.pl is that it doesn't require any
> > setting up to do. I'm personally less likely to use Coccinelle (and
> > Sparse for that matter) on boxes where the software is not installed.
> > I'm not sure how other people feel about it, but I'd personally love
> > to see tools/coccinelle and tools/sparse.
> 
> This was discussed before, and it was felt that perhaps 75000 lines of 
> ocaml code was not really appropriate for the Linux source tree, and also 
> that it would too much complicate our development process.
> 
> One reason for using multiple machines would be to work on multiple 
> architectures.  But Coccinelle is not sensitive to the architecture on 
> which it is run, so perhaps you do't need to have it installed everywhere.
> 
> > As for something more concrete, I guess this is what I'm mostly interested in:
> > 
> > penberg@...uar:~/src/linux$ make C=1 CHECK="scripts/coccicheck" mm/slub.o
> > 
> > I guess it'd be good to document that for 'make help' because now you
> > need to dig through Documentation/coccinelle.txt to find it.
> 
> OK, thanks.  We will look into that.
> 
> > P.S. It seems there's a bug somewhere because the above command fails
> > miserably for me:
> > 
> >   CHK     include/linux/version.h
> >   CHK     include/generated/utsrelease.h
> >   CALL    scripts/checksyscalls.sh
> >   CHECK   mm/slub.c
> > File "/home/penberg/src/linux/scripts/coccinelle/api/memdup_user.cocci",
> > line 32, column 5,  charpos = 747
> >     around = '<+...', whole content = -    <+... when != goto l2;
> > Fatal error: exception Lexer_cocci.Lexical("invalid in a nonempty
> > context: <+...")
> > File "/home/penberg/src/linux/scripts/coccinelle/api/memdup_user.cocci",
> > line 32, column 5,  charpos = 747
> >     around = '<+...', whole content = -    <+... when != goto l2;
> > Fatal error: exception Lexer_cocci.Lexical("invalid in a nonempty
> > context: <+...")
> > File "/home/penberg/src/linux/scripts/coccinelle/api/memdup_user.cocci",
> > line 32, column 5,  charpos = 747
> >     around = '<+...', whole content = -    <+... when != goto l2;
> > Fatal error: exception Lexer_cocci.Lexical("invalid in a nonempty
> > context: <+...")
> > File "/home/penberg/src/linux/scripts/coccinelle/api/memdup_user.cocci",
> > line 32, column 5,  charpos = 747
> >     around = '<+...', whole content = -    <+... when != goto l2;
> > Fatal error: exception Lexer_cocci.Lexical("invalid in a nonempty
> > context: <+...")
> > make[1]: *** [mm/slub.o] Error 1
> > make: *** [mm/slub.o] Error 2
> > 
> > penberg@...uar:~/src/linux$ dpkg -l|grep coccinelle
> > ii  coccinelle                                      0.2.2.deb-2
> >                                         semantic patching tool for C
> > 
> > [ I'm on Ubuntu 10.10. ]
> 
> Indeed that one seems to be quite out of date.  You can get the most 
> recent version here: https://launchpad.net/~npalix/+archive/coccinelle

I never got a working version of coccinelle with scripts in the kernel.
Even the ppa version doesn't work for me. 

make  C=2  CHECK=scripts/coccicheck fs/namei.o
...
....
  CHECK   scripts/mod/empty.c
File "/home/opensource/sources/kernels/linux-2.6/scripts/coccinelle/api/memdup_user.cocci", line 32, column 5,  charpos = 747
    around = '<+...', whole content = -    <+... when != goto l2;
Fatal error: exception Lexer_cocci.Lexical("invalid in a nonempty context: <+...")
File "/home/opensource/sources/kernels/linux-2.6/scripts/coccinelle/api/memdup_user.cocci", line 32, column 5,  charpos = 747
    around = '<+...', whole content = -    <+... when != goto l2;
Fatal error: exception Lexer_cocci.Lexical("invalid in a nonempty context: <+...")
File "/home/opensource/sources/kernels/linux-2.6/scripts/coccinelle/api/memdup_user.cocci", line 32, column 5,  charpos = 747
    around = '<+...', whole content = -    <+... when != goto l2;
Fatal error: exception Lexer_cocci.Lexical("invalid in a nonempty context: <+...")
File "/home/opensource/sources/kernels/linux-2.6/scripts/coccinelle/api/memdup_user.cocci", line 32, column 5,  charpos = 747
    around = '<+...', whole content = -    <+... when != goto l2;
Fatal error: exception Lexer_cocci.Lexical("invalid in a nonempty context: <+...")
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