linux-kernel - Re: spurious sparse warnings from linux/aio.h

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Date:	Fri, 12 Jan 2007 18:46:07 +0100
From:	Tilman Schmidt <tilman@...p.cc>
To:	suparna@...ibm.com
CC:	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org
Subject: Re: spurious sparse warnings from linux/aio.h

Suparna Bhattacharya schrieb:
> On Fri, Jan 12, 2007 at 12:55:18PM +0100, Tilman Schmidt wrote:
[...]
>> 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 ?

So it would seem. The following experimental patch indeed makes
the warnings disappear:

--- linux-2.6.20-rc4-mm1-orig/include/linux/aio.h	2007-01-12 10:33:12.000000000 +0100
+++ linux-2.6.20-rc4-mm1-work/include/linux/aio.h	2007-01-12 18:31:16.000000000 +0100
@@ -243,8 +243,12 @@

-#define io_wait_to_kiocb(io_wait) container_of(container_of(io_wait,	\
-	struct wait_bit_queue, wait), struct kiocb, ki_wait)
+static inline struct kiocb *io_wait_to_kiocb(wait_queue_t *io_wait)
+{
+	struct wait_bit_queue *wbqptr =
+		container_of(io_wait, struct wait_bit_queue, wait);
+	return container_of(wbqptr, struct kiocb, ki_wait);
+}

 #include <linux/aio_abi.h>


Compile checked only - please review.

Thanks
Tilman

-- 
Tilman Schmidt                    E-Mail: tilman@...p.cc
Bonn, Germany
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