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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0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
.config.gz
Description: Binary data
