linux-kernel - Re: linux-next: build failure after merge of the aio tree

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Message-ID: <20160315161901.GA2713@sudip-laptop>
Date:	Tue, 15 Mar 2016 16:19:02 +0000
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
Cc:	Benjamin LaHaise <bcrl@...ck.org>, linux-next@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Michael Ellerman <mpe@...erman.id.au>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linuxppc-dev@...ts.ozlabs.org, Al Viro <viro@...IV.linux.org.uk>,
	Christoph Hellwig <hch@....de>
Subject: Re: linux-next: build failure after merge of the aio tree

On Tue, Mar 15, 2016 at 05:46:34PM +1100, Stephen Rothwell wrote:
> Hi Benjamin,
> 
> After merging the aio tree, today's linux-next build (powerpc
> ppc44x_defconfig) failed like this:
> 
> fs/built-in.o: In function `aio_thread_op_foo_at':
> aio.c:(.text+0x4dab4): undefined reference to `__get_user_bad'
> aio.c:(.text+0x4daec): undefined reference to `__get_user_bad'
> 
> Caused by commit
> 
>   150a0b4905f1 ("aio: add support for async openat()")
> 
> despite commit
> 
>   d2f7a973e11e ("aio: don't use __get_user() for 64 bit values")
> 
> This is due to a bug in the powerpc __get_user_check() macro (the return
> value is defined to be "unsigned long" which is only 32 bits on a 32
> bit platform).

m68k allmodconfig and all defs of m32r fails while building next-20160315.

regards
sudip