linux-kernel - Re: [PATCH 2/2] coccinelle: semantic patch for simple

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Date:	Tue, 06 Mar 2012 00:43:57 -0800
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Julia Lawall <julia.lawall@...6.fr>
CC:	linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH 2/2] coccinelle: semantic patch for simple_open()

On 03/03/12 04:10, Julia Lawall wrote:
>
>
> On Sat, 3 Mar 2012, Stephen Boyd wrote:
>
>> Find instances of an open-coded simple_open() and replace them
>> with calls to simple_open().
>>
>> Cc: Julia Lawall <Julia.Lawall@...6.fr>
>> Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
>> ---
>>
>> This seems to eat the definition of simple_open() as well. Is there
>> a way to say only remove both the function and the reference to
>> the function so that libfs survives?
>
> Try identifier open_f != simple_open;

Ah thanks. That works.

>
> Is there a header file that should be present?

It would be <include/fs.h> which should already be there if there is a 
file_operations structure.

>
> Your transformation rules should include depends on patch in the very 
> first line, after the rule name.
>
> Can you make a report rule?  If not, I will do it.  Someone asked for 
> that to always be present.

I tried but failed. I get:

nit_defs_builtins: /usr/share/coccinelle/standard.h
between: p start 15 p end 15 m1 start 15 m1 end 15 m2 start 15 m2 end 15

   -int -open:open_f-struct -inode -*-open:i-, -struct -file -*-open:f
Fatal error: exception Failure("The semantic patch is structured in a 
way that may give bad results with isomorphisms.  Please try to rewrite 
it by moving + code out from -/context terms.")

When I add this:

@r1 depends on org || report @
identifier open_f != simple_open;
identifier i, f;
position p1;
@@
  int open_f@p1(struct inode *i, struct file *f)
  {
(
  if (i->i_private)
  f->private_data = i->i_private;
|
  f->private_data = i->i_private;
)
  return 0;
  }

@script:python depends on org@
p1 << r1.p1;
@@

cocci.print_main("extra function",p1)


Any ideas what's wrong?

-- 
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.

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