[rcu:rcu/dev 46/46] kernel/rcu/tree.c:2785:2: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/dev
head:   f09c1acfaa4b198694a31ba3e454c7d17c4fa680
commit: f09c1acfaa4b198694a31ba3e454c7d17c4fa680 [46/46] rcu: Add consistency checks for uses of segmented callback lists
config: tile-allmodconfig (attached as .config)
compiler: tilegx-linux-gcc (GCC) 4.6.2
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 f09c1acfaa4b198694a31ba3e454c7d17c4fa680
        # save the attached .config to linux build tree
        make.cross ARCH=tile 

All errors (new ones prefixed by >>):

   kernel/rcu/tree.c: In function 'rcu_do_batch':
   kernel/rcu/tree.c:2785:2: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:2785:2: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:2819:2: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:2819:2: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
>> kernel/rcu/tree.c:2785:2: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
>> kernel/rcu/tree.c:2785:2: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c:2819:2: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c:2819:2: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c: In function 'rcu_start_future_gp':
   kernel/rcu/tree.c:1745:3: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:1745:3: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:1747:3: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:1747:3: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:1745:3: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c:1745:3: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c:1747:3: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c:1747:3: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c: In function 'rcu_start_gp':
   kernel/rcu/tree.c:2374:2: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:2374:2: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:2376:2: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:2376:2: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:2374:2: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c:2374:2: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c:2376:2: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c:2376:2: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c: In function '__note_gp_changes':
   kernel/rcu/tree.c:1897:3: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:1897:3: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:1899:3: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:1899:3: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:1904:3: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:1904:3: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:1906:3: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:1906:3: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:1897:3: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c:1897:3: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c:1899:3: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c:1899:3: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c:1904:3: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c:1904:3: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c:1906:3: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c:1906:3: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c: In function 'rcu_gp_cleanup':
   kernel/rcu/tree.c:2195:2: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:2195:2: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:2197:2: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:2197:2: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:2195:2: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c:2195:2: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c:2197:2: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c:2197:2: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c: In function 'rcu_report_qs_rdp':
   kernel/rcu/tree.c:2539:3: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:2539:3: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:2541:3: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:2541:3: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:2539:3: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c:2539:3: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c:2541:3: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c:2541:3: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   In file included from kernel/rcu/tree.c:4255:0:
   kernel/rcu/tree_plugin.h: In function 'init_nocb_callback_list':
   kernel/rcu/tree_plugin.h:2408:3: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree_plugin.h:2408:3: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
>> kernel/rcu/tree_plugin.h:2408:3: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
>> kernel/rcu/tree_plugin.h:2408:3: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c: In function 'rcu_init_percpu_data':
   kernel/rcu/tree.c:3793:3: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:3793:3: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:3793:3: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c:3793:3: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c: In function '__call_rcu':
   kernel/rcu/tree.c:3154:3: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:3154:3: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:3183:3: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:3183:3: warning: '__x' may be used uninitialized in this function [-Wuninitialized]
   kernel/rcu/tree.c:3154:3: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c:3154:3: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c:3183:3: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg
   kernel/rcu/tree.c:3183:3: error: call to '__xchg_called_with_bad_pointer' declared with attribute error: Bad argument size for xchg

vim +/__xchg_called_with_bad_pointer +2785 kernel/rcu/tree.c

  2779		 * Extract the list of ready callbacks, disabling to prevent
  2780		 * races with call_rcu() from interrupt handlers.  Leave the
  2781		 * callback counts, as rcu_barrier() needs to be conservative.
  2782		 */
  2783		local_irq_save(flags);
  2784		WARN_ON_ONCE(cpu_is_offline(smp_processor_id()));
> 2785		rcu_segcblist_fsck(&rdp->cblist, 100);
  2786		bl = rdp->blimit;
  2787		trace_rcu_batch_start(rsp->name, rcu_segcblist_n_lazy_cbs(&rdp->cblist),
  2788				      rcu_segcblist_n_cbs(&rdp->cblist), bl);

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