linux-kernel - Re: spurious sparse warnings from linux/aio.h (was: 2.6.20-rc4-mm1)

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Message-ID: <20070112131120.GA22364@in.ibm.com>
Date:	Fri, 12 Jan 2007 18:41:20 +0530
From:	Suparna Bhattacharya <suparna@...ibm.com>
To:	Tilman Schmidt <tilman@...p.cc>
Cc:	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org
Subject: Re: spurious sparse warnings from linux/aio.h (was: 2.6.20-rc4-mm1)

On Fri, Jan 12, 2007 at 12:55:18PM +0100, Tilman Schmidt wrote:
> Andrew Morton schrieb:
> > - Merged the "filesystem AIO patches".
> 
> This construct:
> 
> > --- linux-2.6.20-rc4/include/linux/aio.h        2007-01-06 23:34:08.000000000 -0800
> > +++ devel/include/linux/aio.h   2007-01-11 21:36:16.000000000 -0800
> 
> > @@ -237,7 +243,8 @@ do {                                                                        \
> >         }                                                               \
> >  } while (0)
> > 
> > -#define io_wait_to_kiocb(wait) container_of(wait, struct kiocb, ki_wait)
> > +#define io_wait_to_kiocb(io_wait) container_of(container_of(io_wait,   \
> > +       struct wait_bit_queue, wait), struct kiocb, ki_wait)
> > 
> >  #include <linux/aio_abi.h>
> > 
> 
> causes a sparse warning:
> 
> > include/linux/sched.h:1313:29: warning: symbol '__mptr' shadows an earlier one
> > include/linux/sched.h:1313:29: originally declared here
> 
> for every source file referencing <linux/sched.h>.
> Could that be avoided please?

So ... the nested container_of() is a problem ? I guess changing
io_wait_to_kiocb() to be an inline function instead of a macro could help ?

Regards
Suparna

> 
> Thanks
> Tilman
> 
> -- 
> Tilman Schmidt                    E-Mail: tilman@...p.cc
> Bonn, Germany
> Diese Nachricht besteht zu 100% aus wiederverwerteten Bits.
> Ungeöffnet mindestens haltbar bis: (siehe Rückseite)
> 



-- 
Suparna Bhattacharya (suparna@...ibm.com)
Linux Technology Center
IBM Software Lab, India

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