Re: [PATCH v1 07/13] perf/core: add idle hooks

From: kernel test robot
Date: Thu Sep 09 2021 - 07:03:36 EST

Hi Stephane,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on tip/perf/core]
[also build test ERROR on next-20210909]
[cannot apply to tip/sched/core tip/x86/core v5.14]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url: https://github.com/0day-ci/linux/commits/Stephane-Eranian/perf-x86-amd-Add-AMD-Fam19h-Branch-Sampling-support/20210909-160050
base: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 4034fb207e302cc0b1f304084d379640c1fb1436
config: riscv-randconfig-r042-20210908 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 261cbe98c38f8c1ee1a482fe76511110e790f58a)
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
# install riscv cross compiling tool for clang build
# apt-get install binutils-riscv64-linux-gnu
# https://github.com/0day-ci/linux/commit/35333fae36d4dee3e2225674fca8d745364482fa
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Stephane-Eranian/perf-x86-amd-Add-AMD-Fam19h-Branch-Sampling-support/20210909-160050
git checkout 35333fae36d4dee3e2225674fca8d745364482fa
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv

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

All errors (new ones prefixed by >>):

>> kernel/sched/idle.c:182:3: error: implicit declaration of function 'perf_lopwr_cb' [-Werror,-Wimplicit-function-declaration]
perf_lopwr_cb(false);
^
kernel/sched/idle.c:196:4: error: implicit declaration of function 'perf_lopwr_cb' [-Werror,-Wimplicit-function-declaration]
perf_lopwr_cb(true);
^
kernel/sched/idle.c:262:3: error: implicit declaration of function 'perf_lopwr_cb' [-Werror,-Wimplicit-function-declaration]
perf_lopwr_cb(false);
^
kernel/sched/idle.c:296:3: error: implicit declaration of function 'perf_lopwr_cb' [-Werror,-Wimplicit-function-declaration]
perf_lopwr_cb(true);
^
4 errors generated.


vim +/perf_lopwr_cb +182 kernel/sched/idle.c

160
161 /**
162 * cpuidle_idle_call - the main idle function
163 *
164 * NOTE: no locks or semaphores should be used here
165 *
166 * On architectures that support TIF_POLLING_NRFLAG, is called with polling
167 * set, and it returns with polling set. If it ever stops polling, it
168 * must clear the polling bit.
169 */
170 static void cpuidle_idle_call(void)
171 {
172 struct cpuidle_device *dev = cpuidle_get_device();
173 struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev);
174 int next_state, entered_state;
175
176 /*
177 * Check if the idle task must be rescheduled. If it is the
178 * case, exit the function after re-enabling the local irq.
179 */
180 if (need_resched()) {
181 local_irq_enable();
> 182 perf_lopwr_cb(false);
183 return;
184 }
185
186 /*
187 * The RCU framework needs to be told that we are entering an idle
188 * section, so no more rcu read side critical sections and one more
189 * step to the grace period
190 */
191
192 if (cpuidle_not_available(drv, dev)) {
193 tick_nohz_idle_stop_tick();
194
195 if (!cpu_idle_force_poll)
196 perf_lopwr_cb(true);
197
198 default_idle_call();
199
200 if (!cpu_idle_force_poll)
201 perf_lopwr_cb(false);
202
203 goto exit_idle;
204 }
205
206 /*
207 * Suspend-to-idle ("s2idle") is a system state in which all user space
208 * has been frozen, all I/O devices have been suspended and the only
209 * activity happens here and in interrupts (if any). In that case bypass
210 * the cpuidle governor and go straight for the deepest idle state
211 * available. Possibly also suspend the local tick and the entire
212 * timekeeping to prevent timer interrupts from kicking us out of idle
213 * until a proper wakeup interrupt happens.
214 */
215
216 if (idle_should_enter_s2idle() || dev->forced_idle_latency_limit_ns) {
217 u64 max_latency_ns;
218
219 if (idle_should_enter_s2idle()) {
220
221 entered_state = call_cpuidle_s2idle(drv, dev);
222 if (entered_state > 0)
223 goto exit_idle;
224
225 max_latency_ns = U64_MAX;
226 } else {
227 max_latency_ns = dev->forced_idle_latency_limit_ns;
228 }
229
230 tick_nohz_idle_stop_tick();
231
232 next_state = cpuidle_find_deepest_state(drv, dev, max_latency_ns);
233 call_cpuidle(drv, dev, next_state);
234 } else {
235 bool stop_tick = true;
236
237 /*
238 * Ask the cpuidle framework to choose a convenient idle state.
239 */
240 next_state = cpuidle_select(drv, dev, &stop_tick);
241
242 if (stop_tick || tick_nohz_tick_stopped())
243 tick_nohz_idle_stop_tick();
244 else
245 tick_nohz_idle_retain_tick();
246
247 entered_state = call_cpuidle(drv, dev, next_state);
248 /*
249 * Give the governor an opportunity to reflect on the outcome
250 */
251 cpuidle_reflect(dev, entered_state);
252 }
253
254 exit_idle:
255 __current_set_polling();
256
257 /*
258 * It is up to the idle functions to reenable local interrupts
259 */
260 if (WARN_ON_ONCE(irqs_disabled())) {
261 local_irq_enable();
262 perf_lopwr_cb(false);
263 }
264 }
265

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

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