linux-kernel - [rcu:rcu/next 28/28] include/linux/compiler.h:536:47: error: dereferencing pointer to incomplete type

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Date:	Fri, 12 Aug 2016 03:43:45 +0800
From:	kbuild test robot <fengguang.wu@...el.com>
To:	Johannes Berg <johannes.berg@...el.com>
Cc:	kbuild-all@...org, linux-kernel@...r.kernel.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [rcu:rcu/next 28/28] include/linux/compiler.h:536:47: error:
 dereferencing pointer to incomplete type

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/next
head:   a1dff3e407c785ab982810d0b14f829aaf3022b6
commit: a1dff3e407c785ab982810d0b14f829aaf3022b6 [28/28] locking/barriers: suppress sparse warnings in lockless_dereference()
config: ia64-defconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 4.9.0
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout a1dff3e407c785ab982810d0b14f829aaf3022b6
        # save the attached .config to linux build tree
        make.cross ARCH=ia64 

All errors (new ones prefixed by >>):

   In file included from include/linux/linkage.h:4:0,
                    from include/linux/kernel.h:6,
                    from drivers/gpu/drm/drm_fb_helper.c:32:
   drivers/gpu/drm/drm_fb_helper.c: In function 'drm_fb_helper_is_bound':
>> include/linux/compiler.h:536:47: error: dereferencing pointer to incomplete type
     size_t __maybe_unused __size_of_ptr = sizeof(*(p)); \
                                                  ^
   drivers/gpu/drm/drm_fb_helper.c:467:6: note: in expansion of macro 'lockless_dereference'
     if (lockless_dereference(dev->master))
         ^

vim +536 include/linux/compiler.h

   530	 * The seemingly unused size_t variable is to validate @p is indeed a pointer
   531	 * type by making sure it can be dereferenced.
   532	 */
   533	#define lockless_dereference(p) \
   534	({ \
   535		typeof(p) _________p1 = READ_ONCE(p); \
 > 536		size_t __maybe_unused __size_of_ptr = sizeof(*(p)); \
   537		smp_read_barrier_depends(); /* Dependency order vs. p above. */ \
   538		(_________p1); \
   539	})

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