netdev - linux-next: build failure after merge of the akpm tree

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Date:	Fri, 30 Sep 2011 15:32:55 +1000
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Stephen Boyd <sboyd@...eaurora.org>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	David Miller <davem@...emloft.net>, <netdev@...r.kernel.org>
Subject: linux-next: build failure after merge of the akpm tree

Hi Andrew,

After merging the akpm tree, today's linux-next build (x86_64 allmodconfig)
failed like this:

In file included from arch/x86/include/asm/uaccess.h:575:0,
                 from include/net/checksum.h:25,
                 from include/linux/skbuff.h:28,
                 from include/linux/icmpv6.h:82,
                 from net/compat.c:19:
In function 'copy_from_user',
    inlined from 'compat_sys_socketcall' at net/compat.c:793:20:
arch/x86/include/asm/uaccess_64.h:64:26: error: call to 'copy_from_user_overflow' declared with attribute error: copy_from_user() buffer size is not provably correct

Caused by commit 15e19cbbbf2a ("x86: implement strict user copy checks
for x86_64") when built with gcc 4.6.0.  This does not fail when built
with 4.5.2.

The problem here is that the length parameter to copy_from_user() is
obtained by indexing into an array of sizes.  Making the array const
does not help (obviously, since the index is not known at compile time
anyway).

Maybe I need a newer compiler.  For today I have gone back to my 4.5.2
compiler.

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au
http://www.canb.auug.org.au/~sfr/

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