Messages in this thread | | | Date | Fri, 12 Aug 2016 02:44:55 +0800 | From | kbuild test robot <> | Subject | [rcu:rcu/next 28/28] include/linux/compiler.h:536:47: error: dereferencing pointer to incomplete type 'struct drm_master' |
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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: i386-randconfig-s0-201632 (attached as .config) compiler: gcc-6 (Debian 6.1.1-9) 6.1.1 20160705 reproduce: git checkout a1dff3e407c785ab982810d0b14f829aaf3022b6 # save the attached .config to linux build tree make ARCH=i386
All error/warnings (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 'struct drm_master' 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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