[tglx-devel:rtmutex 3/65] include/linux/sched.h:211:3: error: implicit declaration of function 'debug_special_state_change'

From: kernel test robot
Date: Wed Aug 04 2021 - 14:40:59 EST

tree: https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git rtmutex
head: 91fb95023a1645acf99daa67e51cc1f5e2bc8b8e
commit: c4c28f993851857356b76b7471f74cd154d58b84 [3/65] sched: Reorganize current::__state helpers
config: nios2-randconfig-r032-20210804 (attached as .config)
compiler: nios2-linux-gcc (GCC) 10.3.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git/commit/?id=c4c28f993851857356b76b7471f74cd154d58b84
git remote add tglx-devel https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git
git fetch --no-tags tglx-devel rtmutex
git checkout c4c28f993851857356b76b7471f74cd154d58b84
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross ARCH=nios2

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

In file included from arch/nios2/kernel/asm-offsets.c:7:
include/linux/sched.h:147:3: error: invalid preprocessing directive #debug_normal_state_change
147 | # debug_normal_state_change(cond) do { } while (0)
| ^~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/sched.h:148:3: error: invalid preprocessing directive #debug_special_state_change
148 | # debug_special_state_change(cond) do { } while (0)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from arch/nios2/kernel/asm-offsets.c:7:
include/linux/sched/signal.h: In function 'kernel_signal_stop':
>> include/linux/sched.h:211:3: error: implicit declaration of function 'debug_special_state_change' [-Werror=implicit-function-declaration]
211 | debug_special_state_change((state_value)); \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/sched/signal.h:296:3: note: in expansion of macro 'set_special_state'
296 | set_special_state(TASK_STOPPED);
| ^~~~~~~~~~~~~~~~~
include/linux/rcuwait.h: In function 'finish_rcuwait':
>> include/linux/sched.h:190:3: error: implicit declaration of function 'debug_normal_state_change' [-Werror=implicit-function-declaration]
190 | debug_normal_state_change((state_value)); \
| ^~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/rcuwait.h:53:2: note: in expansion of macro '__set_current_state'
53 | __set_current_state(TASK_RUNNING);
| ^~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors
--
In file included from arch/nios2/kernel/asm-offsets.c:7:
include/linux/sched.h:147:3: error: invalid preprocessing directive #debug_normal_state_change
147 | # debug_normal_state_change(cond) do { } while (0)
| ^~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/sched.h:148:3: error: invalid preprocessing directive #debug_special_state_change
148 | # debug_special_state_change(cond) do { } while (0)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from arch/nios2/kernel/asm-offsets.c:7:
include/linux/sched/signal.h: In function 'kernel_signal_stop':
>> include/linux/sched.h:211:3: error: implicit declaration of function 'debug_special_state_change' [-Werror=implicit-function-declaration]
211 | debug_special_state_change((state_value)); \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/sched/signal.h:296:3: note: in expansion of macro 'set_special_state'
296 | set_special_state(TASK_STOPPED);
| ^~~~~~~~~~~~~~~~~
include/linux/rcuwait.h: In function 'finish_rcuwait':
>> include/linux/sched.h:190:3: error: implicit declaration of function 'debug_normal_state_change' [-Werror=implicit-function-declaration]
190 | debug_normal_state_change((state_value)); \
| ^~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/rcuwait.h:53:2: note: in expansion of macro '__set_current_state'
53 | __set_current_state(TASK_RUNNING);
| ^~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors
make[2]: *** [scripts/Makefile.build:117: arch/nios2/kernel/asm-offsets.s] Error 1
make[2]: Target '__build' not remade because of errors.
make[1]: *** [Makefile:1213: prepare0] Error 2
make[1]: Target 'prepare' not remade because of errors.
make: *** [Makefile:220: __sub-make] Error 2
make: Target 'prepare' not remade because of errors.


vim +/debug_special_state_change +211 include/linux/sched.h

150
151 /*
152 * set_current_state() includes a barrier so that the write of current->state
153 * is correctly serialised wrt the caller's subsequent test of whether to
154 * actually sleep:
155 *
156 * for (;;) {
157 * set_current_state(TASK_UNINTERRUPTIBLE);
158 * if (CONDITION)
159 * break;
160 *
161 * schedule();
162 * }
163 * __set_current_state(TASK_RUNNING);
164 *
165 * If the caller does not need such serialisation (because, for instance, the
166 * CONDITION test and condition change and wakeup are under the same lock) then
167 * use __set_current_state().
168 *
169 * The above is typically ordered against the wakeup, which does:
170 *
171 * CONDITION = 1;
172 * wake_up_state(p, TASK_UNINTERRUPTIBLE);
173 *
174 * where wake_up_state()/try_to_wake_up() executes a full memory barrier before
175 * accessing p->state.
176 *
177 * Wakeup will do: if (@state & p->state) p->state = TASK_RUNNING, that is,
178 * once it observes the TASK_UNINTERRUPTIBLE store the waking CPU can issue a
179 * TASK_RUNNING store which can collide with __set_current_state(TASK_RUNNING).
180 *
181 * However, with slightly different timing the wakeup TASK_RUNNING store can
182 * also collide with the TASK_UNINTERRUPTIBLE store. Losing that store is not
183 * a problem either because that will result in one extra go around the loop
184 * and our @cond test will save the day.
185 *
186 * Also see the comments of try_to_wake_up().
187 */
188 #define __set_current_state(state_value) \
189 do { \
> 190 debug_normal_state_change((state_value)); \
191 WRITE_ONCE(current->__state, (state_value)); \
192 } while (0)
193
194 #define set_current_state(state_value) \
195 do { \
196 debug_normal_state_change((state_value)); \
197 smp_store_mb(current->__state, (state_value)); \
198 } while (0)
199
200 /*
201 * set_special_state() should be used for those states when the blocking task
202 * can not use the regular condition based wait-loop. In that case we must
203 * serialize against wakeups such that any possible in-flight TASK_RUNNING
204 * stores will not collide with our state change.
205 */
206 #define set_special_state(state_value) \
207 do { \
208 unsigned long flags; /* may shadow */ \
209 \
210 raw_spin_lock_irqsave(&current->pi_lock, flags); \
> 211 debug_special_state_change((state_value)); \
212 WRITE_ONCE(current->__state, (state_value)); \
213 raw_spin_unlock_irqrestore(&current->pi_lock, flags); \
214 } while (0)
215

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