linux-kernel - Re: [PATCH][RFC] err.h: silence sparse warning: dereference of noderef expression

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Date:	Wed, 11 Jun 2014 07:06:32 -0400
From:	Jeff Layton <jlayton@...chiereds.net>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	linux-kernel@...r.kernel.org, linux-sparse@...r.kernel.org,
	Jeff Layton <jlayton@...marydata.com>
Subject: Re: [PATCH][RFC] err.h: silence sparse warning: dereference of
 noderef expression

On Wed, 11 Jun 2014 08:45:18 +0300
Dan Carpenter <dan.carpenter@...cle.com> wrote:

> On Tue, Jun 10, 2014 at 05:38:49PM -0400, Jeff Layton wrote:
> > From: Jeff Layton <jlayton@...marydata.com>
> > 
> > Lately, when I do a make with C=1, I get *tons* of these warnings:
> > 
> >     include/linux/err.h:35:16: warning: dereference of noderef expression
> >     include/linux/err.h:30:23: warning: dereference of noderef expression
> 
> Which version of Sparse, which version of the kernel and which .c file
> can I compile to reproduce this?
> 
> I built fs/cifs/ and I didn't see the sparse warning.
> 
> regards,
> dan carpenter
> 

$ rpm -q sparse
sparse-0.5.0-1.fc20.x86_64

I see it all over the tree, but an easy example is fs/locks.c:

$ make fs/locks.o C=1
make[1]: Nothing to be done for `all'.
make[1]: Nothing to be done for `relocs'.
  CHK     include/config/kernel.release
  CHK     include/generated/uapi/linux/version.h
  CHK     include/generated/utsrelease.h
  CALL    scripts/checksyscalls.sh
  CHECK   fs/locks.c
include/linux/err.h:35:16: warning: dereference of noderef expression
include/linux/err.h:30:23: warning: dereference of noderef expression
include/linux/err.h:35:16: warning: dereference of noderef expression
include/linux/err.h:30:23: warning: dereference of noderef expression
  CC      fs/locks.o

It has two IS_ERR calls and two PTR_ERR calls, and each generates the
warning.

-- 
Jeff Layton <jlayton@...chiereds.net>
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