linux-kernel - linux-next: build warnings after merge of the access

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Date:	Thu, 26 Mar 2015 19:31:12 +1100
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Christian Borntraeger <borntraeger@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Davidlohr Bueso <dave@...olabs.net>
Subject: linux-next: build warnings after merge of the access_once tree

Hi Christian,

After merging the access_once tree, today's linux-next build (arm
multi_v7_defconfig) produced lots of this warning:

In file included from include/linux/linkage.h:4:0,
                 from include/linux/preempt.h:9,
                 from include/linux/spinlock.h:50,
                 from include/linux/lockref.h:17,
                 from lib/lockref.c:2:
In function '__read_once_size',
    inlined from 'lockref_get' at lib/lockref.c:50:2:
include/linux/compiler.h:216:3: warning: call to 'data_access_exceeds_word_size' declared with attribute warning: data access exceeds word size and won't be atomic
   data_access_exceeds_word_size();
   ^

Introduced by commit 6becd6bd5e89 ("compiler.h: Fix word size check for
READ/WRITE_ONCE") presumably interacting with commit 4d3199e4ca8e
("locking: Remove ACCESS_ONCE() usage") from the tip tree.

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au

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