tree: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/next head: b9d38ad8ef2a0ae0ba6e03ac6bf8085382a9c98c commit: 89489e6fa42785b3fc4c78f46c78cb73b9a164d3 [51/58] srcu: Create a tiny SRCU config: x86_64-randconfig-ne0-04120549 (attached as .config) compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 reproduce: git checkout 89489e6fa42785b3fc4c78f46c78cb73b9a164d3 # save the attached .config to linux build tree make ARCH=x86_64
Note: the rcu/rcu/next HEAD b9d38ad8ef2a0ae0ba6e03ac6bf8085382a9c98c builds
fine.
It only hurts bisectibility.
All error/warnings (new ones prefixed by >>):
In file included from include/uapi/linux/stddef.h:1:0,
from include/linux/stddef.h:4,
from include/uapi/linux/posix_types.h:4,
from include/uapi/linux/types.h:13,
from include/linux/types.h:5,
from include/linux/list.h:4,
from include/linux/rculist.h:9,
from mm/mmu_notifier.c:12:
mm/mmu_notifier.c: In function 'do_mmu_notifier_register':
>> mm/mmu_notifier.c:259:14: error: 'struct srcu_struct' has no member named
>> 'per_cpu_ref'
BUG_ON(!srcu.per_cpu_ref);
^
include/linux/compiler.h:179:42: note: in definition of macro 'unlikely'
# define unlikely(x) __builtin_expect(!!(x), 0)
^
>> mm/mmu_notifier.c:259:2: note: in expansion of macro 'BUG_ON'
BUG_ON(!srcu.per_cpu_ref);
^~~~~~
vim +259 mm/mmu_notifier.c
cddb8a5c Andrea Arcangeli 2008-07-28 253
BUG_ON(atomic_read(&mm->mm_users) <= 0);
cddb8a5c Andrea Arcangeli 2008-07-28 254
21a92735 Sagi Grimberg 2012-10-08 255 /*
21a92735 Sagi Grimberg 2012-10-08 256 * Verify that
mmu_notifier_init() already run and the global srcu is
21a92735 Sagi Grimberg 2012-10-08 257 * initialized.
21a92735 Sagi Grimberg 2012-10-08 258 */
21a92735 Sagi Grimberg 2012-10-08 @259 BUG_ON(!srcu.per_cpu_ref);
21a92735 Sagi Grimberg 2012-10-08 260
35cfa2b0 Gavin Shan 2012-10-25 261 ret = -ENOMEM;
35cfa2b0 Gavin Shan 2012-10-25 262 mmu_notifier_mm =
kmalloc(sizeof(struct mmu_notifier_mm), GFP_KERNEL);
:::::: The code at line 259 was first introduced by commit
:::::: 21a92735f660eaecf69a6f2e777f18463760ec32 mm: mmu_notifier: have
mmu_notifiers use a global SRCU so they may safely schedule
:::::: TO: Sagi Grimberg <[email protected]>
:::::: CC: Linus Torvalds <[email protected]>
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