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From: Arnd Bergmann <arnd@arndb.de>
To: linuxppc-dev@lists.ozlabs.org
Cc: Benjamin LaHaise <bcrl@kvack.org>,
 Sudip Mukherjee <sudipm.mukherjee@gmail.com>,
 Stephen Rothwell <sfr@canb.auug.org.au>, linux-kernel@vger.kernel.org,
 linux-next@vger.kernel.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
Date: Tue, 15 Mar 2016 23:02:29 +0100
Message-ID: <15874870.hBfxUomX5V@wuerfel>
In-Reply-To: <20160315162228.GP17923@kvack.org>
References: <20160315174634.6766cd88@canb.auug.org.au>
 <20160315161901.GA2713@sudip-laptop> <20160315162228.GP17923@kvack.org>
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On Tuesday 15 March 2016 12:22:28 Benjamin LaHaise wrote:
> On Tue, Mar 15, 2016 at 04:19:02PM +0000, Sudip Mukherjee wrote:
> > 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
> 
> I've removed everything from the aio-next.git tree for now.  Will revisit 
> after the merge window.
> 

I've also sent a patch that fixes the link error on ARM and that should
work on all other architectures too.

	Arnd