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

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Date:	Tue, 15 Mar 2016 23:02:29 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linuxppc-dev@...ts.ozlabs.org
Cc:	Benjamin LaHaise <bcrl@...ck.org>,
	Sudip Mukherjee <sudipm.mukherjee@...il.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-kernel@...r.kernel.org, linux-next@...r.kernel.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 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