Date: Tue, 15 Mar 2016 16:19:02 +0000
From: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
To: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Benjamin LaHaise <bcrl@kvack.org>, linux-next@vger.kernel.org,
        linux-kernel@vger.kernel.org, Michael Ellerman <mpe@ellerman.id.au>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        linuxppc-dev@lists.ozlabs.org, Al Viro <viro@ZenIV.linux.org.uk>,
        Christoph Hellwig <hch@lst.de>
Subject: Re: linux-next: build failure after merge of the aio tree
Message-ID: <20160315161901.GA2713@sudip-laptop>
References: <20160315174634.6766cd88@canb.auug.org.au>
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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