* [intel-linux-intel-lts:4.19/android_r 19120/20689] arch/x86/kernel/smp.c:273:1: sparse: sparse: unused label 'finish'
@ 2020-12-11 15:46 kernel test robot
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From: kernel test robot @ 2020-12-11 15:46 UTC (permalink / raw)
To: kbuild
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CC: kbuild-all(a)lists.01.org
TO: Alistair Delva <adelva@google.com>
CC: "Pan, Kris" <kris.pan@intel.com>
tree: https://github.com/intel/linux-intel-lts.git 4.19/android_r
head: 4a6aef8d991e7c47e5da39927e0ad28ec90cd01b
commit: b652a52d36a85d1b731921ba08e701d7150ce200 [19120/20689] Merge branch 'aosp/android-4.19-stable' into android_r
:::::: branch date: 31 hours ago
:::::: commit date: 4 months ago
config: i386-randconfig-s001-20201209 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce:
# apt-get install sparse
# sparse version: v0.6.3-179-ga00755aa-dirty
# https://github.com/intel/linux-intel-lts/commit/b652a52d36a85d1b731921ba08e701d7150ce200
git remote add intel-linux-intel-lts https://github.com/intel/linux-intel-lts.git
git fetch --no-tags intel-linux-intel-lts 4.19/android_r
git checkout b652a52d36a85d1b731921ba08e701d7150ce200
# save the attached .config to linux build tree
make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
"sparse warnings: (new ones prefixed by >>)"
>> arch/x86/kernel/smp.c:273:1: sparse: sparse: unused label 'finish'
arch/x86/kernel/smp.c:190:16: warning: no previous prototype for 'smp_reboot_interrupt' [-Wmissing-prototypes]
190 | __visible void smp_reboot_interrupt(struct pt_regs *regs)
| ^~~~~~~~~~~~~~~~~~~~
arch/x86/kernel/smp.c: In function 'native_stop_other_cpus':
arch/x86/kernel/smp.c:273:1: warning: label 'finish' defined but not used [-Wunused-label]
273 | finish:
| ^~~~~~
arch/x86/kernel/smp.c: At top level:
arch/x86/kernel/smp.c:285:28: warning: no previous prototype for 'smp_reschedule_interrupt' [-Wmissing-prototypes]
285 | __visible void __irq_entry smp_reschedule_interrupt(struct pt_regs *regs)
| ^~~~~~~~~~~~~~~~~~~~~~~~
arch/x86/kernel/smp.c:306:28: warning: no previous prototype for 'smp_call_function_interrupt' [-Wmissing-prototypes]
306 | __visible void __irq_entry smp_call_function_interrupt(struct pt_regs *regs)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/x86/kernel/smp.c:316:28: warning: no previous prototype for 'smp_call_function_single_interrupt' [-Wmissing-prototypes]
316 | __visible void __irq_entry smp_call_function_single_interrupt(struct pt_regs *r)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
vim +/finish +273 arch/x86/kernel/smp.c
ce7fdd5cd83e0a Grzegorz Halat 2019-06-28 204
5d2b86d90f7cc4 Don Zickus 2012-05-11 205 static void native_stop_other_cpus(int wait)
f9e47a126be2ea Glauber Costa 2008-03-03 206 {
f9e47a126be2ea Glauber Costa 2008-03-03 207 unsigned long flags;
76fac077db6b34 Alok Kataria 2010-10-11 208 unsigned long timeout;
f9e47a126be2ea Glauber Costa 2008-03-03 209
f9e47a126be2ea Glauber Costa 2008-03-03 210 if (reboot_force)
f9e47a126be2ea Glauber Costa 2008-03-03 211 return;
f9e47a126be2ea Glauber Costa 2008-03-03 212
4ef702c10b5df1 Andi Kleen 2009-05-27 213 /*
4ef702c10b5df1 Andi Kleen 2009-05-27 214 * Use an own vector here because smp_call_function
4ef702c10b5df1 Andi Kleen 2009-05-27 215 * does lots of things not suitable in a panic situation.
7d007d21e539db Don Zickus 2012-05-11 216 */
7d007d21e539db Don Zickus 2012-05-11 217
7d007d21e539db Don Zickus 2012-05-11 218 /*
7d007d21e539db Don Zickus 2012-05-11 219 * We start by using the REBOOT_VECTOR irq.
7d007d21e539db Don Zickus 2012-05-11 220 * The irq is treated as a sync point to allow critical
7d007d21e539db Don Zickus 2012-05-11 221 * regions of code on other cpus to release their spin locks
7d007d21e539db Don Zickus 2012-05-11 222 * and re-enable irqs. Jumping straight to an NMI might
7d007d21e539db Don Zickus 2012-05-11 223 * accidentally cause deadlocks with further shutdown/panic
7d007d21e539db Don Zickus 2012-05-11 224 * code. By syncing, we give the cpus up to one second to
7d007d21e539db Don Zickus 2012-05-11 225 * finish their work before we force them off with the NMI.
4ef702c10b5df1 Andi Kleen 2009-05-27 226 */
4ef702c10b5df1 Andi Kleen 2009-05-27 227 if (num_online_cpus() > 1) {
7d007d21e539db Don Zickus 2012-05-11 228 /* did someone beat us here? */
7d007d21e539db Don Zickus 2012-05-11 229 if (atomic_cmpxchg(&stopping_cpu, -1, safe_smp_processor_id()) != -1)
7d007d21e539db Don Zickus 2012-05-11 230 return;
7d007d21e539db Don Zickus 2012-05-11 231
7d007d21e539db Don Zickus 2012-05-11 232 /* sync above data before sending IRQ */
7d007d21e539db Don Zickus 2012-05-11 233 wmb();
7d007d21e539db Don Zickus 2012-05-11 234
4ef702c10b5df1 Andi Kleen 2009-05-27 235 apic->send_IPI_allbutself(REBOOT_VECTOR);
4ef702c10b5df1 Andi Kleen 2009-05-27 236
76fac077db6b34 Alok Kataria 2010-10-11 237 /*
ce7fdd5cd83e0a Grzegorz Halat 2019-06-28 238 * Don't wait longer than a second for IPI completion. The
ce7fdd5cd83e0a Grzegorz Halat 2019-06-28 239 * wait request is not checked here because that would
ce7fdd5cd83e0a Grzegorz Halat 2019-06-28 240 * prevent an NMI shutdown attempt in case that not all
ce7fdd5cd83e0a Grzegorz Halat 2019-06-28 241 * CPUs reach shutdown state.
76fac077db6b34 Alok Kataria 2010-10-11 242 */
76fac077db6b34 Alok Kataria 2010-10-11 243 timeout = USEC_PER_SEC;
ce7fdd5cd83e0a Grzegorz Halat 2019-06-28 244 while (num_online_cpus() > 1 && timeout--)
4ef702c10b5df1 Andi Kleen 2009-05-27 245 udelay(1);
4ef702c10b5df1 Andi Kleen 2009-05-27 246 }
4ef702c10b5df1 Andi Kleen 2009-05-27 247
7d007d21e539db Don Zickus 2012-05-11 248 /* if the REBOOT_VECTOR didn't work, try with the NMI */
ce7fdd5cd83e0a Grzegorz Halat 2019-06-28 249 if (num_online_cpus() > 1) {
ce7fdd5cd83e0a Grzegorz Halat 2019-06-28 250 /*
ce7fdd5cd83e0a Grzegorz Halat 2019-06-28 251 * If NMI IPI is enabled, try to register the stop handler
ce7fdd5cd83e0a Grzegorz Halat 2019-06-28 252 * and send the IPI. In any case try to wait for the other
ce7fdd5cd83e0a Grzegorz Halat 2019-06-28 253 * CPUs to stop.
ce7fdd5cd83e0a Grzegorz Halat 2019-06-28 254 */
ce7fdd5cd83e0a Grzegorz Halat 2019-06-28 255 if (!smp_no_nmi_ipi && !register_stop_handler()) {
ce7fdd5cd83e0a Grzegorz Halat 2019-06-28 256 /* Sync above data before sending IRQ */
7d007d21e539db Don Zickus 2012-05-11 257 wmb();
7d007d21e539db Don Zickus 2012-05-11 258
7d007d21e539db Don Zickus 2012-05-11 259 pr_emerg("Shutting down cpus with NMI\n");
7d007d21e539db Don Zickus 2012-05-11 260
7d007d21e539db Don Zickus 2012-05-11 261 apic->send_IPI_allbutself(NMI_VECTOR);
ce7fdd5cd83e0a Grzegorz Halat 2019-06-28 262 }
7d007d21e539db Don Zickus 2012-05-11 263 /*
ce7fdd5cd83e0a Grzegorz Halat 2019-06-28 264 * Don't wait longer than 10 ms if the caller didn't
ce7fdd5cd83e0a Grzegorz Halat 2019-06-28 265 * reqeust it. If wait is true, the machine hangs here if
ce7fdd5cd83e0a Grzegorz Halat 2019-06-28 266 * one or more CPUs do not reach shutdown state.
7d007d21e539db Don Zickus 2012-05-11 267 */
7d007d21e539db Don Zickus 2012-05-11 268 timeout = USEC_PER_MSEC * 10;
7d007d21e539db Don Zickus 2012-05-11 269 while (num_online_cpus() > 1 && (wait || timeout--))
7d007d21e539db Don Zickus 2012-05-11 270 udelay(1);
7d007d21e539db Don Zickus 2012-05-11 271 }
7d007d21e539db Don Zickus 2012-05-11 272
7d007d21e539db Don Zickus 2012-05-11 @273 finish:
cd7b77710e3d52 Duan, YayongX 2017-12-27 274 store_regs(NULL);
f9e47a126be2ea Glauber Costa 2008-03-03 275 local_irq_save(flags);
f9e47a126be2ea Glauber Costa 2008-03-03 276 disable_local_APIC();
8838eb6c0bf3b6 Ashok Raj 2015-08-12 277 mcheck_cpu_clear(this_cpu_ptr(&cpu_info));
f9e47a126be2ea Glauber Costa 2008-03-03 278 local_irq_restore(flags);
f9e47a126be2ea Glauber Costa 2008-03-03 279 }
f9e47a126be2ea Glauber Costa 2008-03-03 280
:::::: The code at line 273 was first introduced by commit
:::::: 7d007d21e539dbecb6942c5734e6649f720982cf x86/reboot: Use NMI to assist in shutting down if IRQ fails
:::::: TO: Don Zickus <dzickus@redhat.com>
:::::: CC: Ingo Molnar <mingo@kernel.org>
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org
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2020-12-11 15:46 [intel-linux-intel-lts:4.19/android_r 19120/20689] arch/x86/kernel/smp.c:273:1: sparse: sparse: unused label 'finish' kernel test robot
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