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Subject[rcu:rcu/next 27/27] kernel/rcu/rcu.h:225:8: error: 'rcu_cpu_stall_suppress' undeclared
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/next
head: 909bd6e3d9e73fd0ca1d6255466573d4c3fbe321
commit: 909bd6e3d9e73fd0ca1d6255466573d4c3fbe321 [27/27] rcu: Suppress RCU CPU stall warnings while dumping trace
config: i386-randconfig-x000-201735 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
git checkout 909bd6e3d9e73fd0ca1d6255466573d4c3fbe321
# save the attached .config to linux build tree
make ARCH=i386

All error/warnings (new ones prefixed by >>):

In file included from kernel/rcu/rcuperf.c:51:0:
kernel/rcu/rcuperf.c: In function 'rcu_perf_writer':
>> kernel/rcu/rcu.h:225:8: error: 'rcu_cpu_stall_suppress' undeclared (first use in this function)
if (!rcu_cpu_stall_suppress) \
^
>> kernel/rcu/rcuperf.c:482:5: note: in expansion of macro 'rcu_ftrace_dump'
rcu_ftrace_dump(DUMP_ALL);
^~~~~~~~~~~~~~~
kernel/rcu/rcu.h:225:8: note: each undeclared identifier is reported only once for each function it appears in
if (!rcu_cpu_stall_suppress) \
^
>> kernel/rcu/rcuperf.c:482:5: note: in expansion of macro 'rcu_ftrace_dump'
rcu_ftrace_dump(DUMP_ALL);
^~~~~~~~~~~~~~~

vim +/rcu_cpu_stall_suppress +225 kernel/rcu/rcu.h

214
215 /*
216 * Dump the ftrace buffer, but only one time per callsite per boot.
217 */
218 #define rcu_ftrace_dump(oops_dump_mode) \
219 do { \
220 static atomic_t ___rfd_beenhere = ATOMIC_INIT(0); \
221 \
222 if (!atomic_read(&___rfd_beenhere) && \
223 !atomic_xchg(&___rfd_beenhere, 1)) { \
224 tracing_off(); \
> 225 if (!rcu_cpu_stall_suppress) \
226 rcu_cpu_stall_suppress = 3; \
227 ftrace_dump(oops_dump_mode); \
228 if (rcu_cpu_stall_suppress == 3) \
229 rcu_cpu_stall_suppress = 0; \
230 } \
231 } while (0)
232

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