netdev - sparse checking prevented by "net: fix kmemcheck annotations"

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Date:	Mon, 01 Mar 2010 13:09:29 +0100
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	linux-kernel@...r.kernel.org, Eric Dumazet <eric.dumazet@...il.com>
CC:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: sparse checking prevented by "net: fix kmemcheck annotations"

Hi all,

the post 2.6.32-rc5, pre 2.6.32-rc6 commit 14d18a81 causes a serious
regression for sparse checks:  make C=1 CF="-D__CHECK_ENDIAN__" now
causes sparse to log

    include/linux/skbuff.h:357:41: error: invalid bitfield specifier for
    type restricted __be16.

I reported this already shortly after this hit the mainline.  But back
then I didn't notice that this sparse error causes sparse to remain
silent on all subsequent warnings in a file!

We need to either change sparse to accept this bogus bit field that
occurs in skbuff.h (__be16 protocol:16;), silently or with a warning, or
revert this kmemcheck annotation.

("We" == preferably Eric :-)

skbuff.h is included by lots of drivers, even ones that are not even
networking drivers, notably DVB drivers.  None of these drivers can be
checked with sparse's __CHECK_ENDIAN__ at the moment.
-- 
Stefan Richter
-=====-==-=- --== ----=
http://arcgraph.de/sr/
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