* [linux-next:master 7183/13846] kernel/hazptr.c:178: Warning: missing closing `"'
@ 2026-08-08 0:58 kernel test robot
2026-08-08 5:26 ` Paul E. McKenney
0 siblings, 1 reply; 2+ messages in thread
From: kernel test robot @ 2026-08-08 0:58 UTC (permalink / raw)
To: Mathieu Desnoyers; +Cc: oe-kbuild-all, Paul E. McKenney
tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head: 6b8c8af514d739d0335f5579b585e02babe8a727
commit: 9d30872a4c09c2e8a97084ef1fe6913f6bf9e34d [7183/13846] hazptr: Implement Hazard Pointers
config: s390-randconfig-001-20260808 (https://download.01.org/0day-ci/archive/20260808/202608080824.VRQz4FGl-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260808/202608080824.VRQz4FGl-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202608080824.VRQz4FGl-lkp@intel.com/
All warnings (new ones prefixed by >>):
kernel/hazptr.c: Assembler messages:
>> kernel/hazptr.c:178: Warning: missing closing `"'
>> kernel/hazptr.c:178: Warning: missing closing `"'
>> kernel/hazptr.c:178: Warning: missing closing `"'
>> kernel/hazptr.c:178: Warning: missing closing `"'
>> kernel/hazptr.c:178: Warning: missing closing `"'
>> kernel/hazptr.c:178: Warning: missing closing `"'
>> kernel/hazptr.c:178: Warning: missing closing `"'
>> kernel/hazptr.c:178: Warning: missing closing `"'
>> kernel/hazptr.c:178: Warning: missing closing `"'
>> kernel/hazptr.c:178: Warning: missing closing `"'
>> kernel/hazptr.c:178: Warning: missing closing `"'
>> kernel/hazptr.c:178: Warning: missing closing `"'
>> kernel/hazptr.c:178: Warning: missing closing `"'
>> kernel/hazptr.c:178: Warning: missing closing `"'
>> kernel/hazptr.c:178: Warning: missing closing `"'
>> kernel/hazptr.c:178: Warning: missing closing `"'
>> kernel/hazptr.c:178: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
>> kernel/hazptr.c:178: Warning: missing closing `"'
>> kernel/hazptr.c:178: Warning: missing closing `"'
>> kernel/hazptr.c:178: Warning: missing closing `"'
kernel/hazptr.c:178: Warning: missing closing `"'
kernel/hazptr.c:178: Warning: missing closing `"'
kernel/hazptr.c:178: Warning: missing closing `"'
kernel/hazptr.c:178: Warning: missing closing `"'
kernel/hazptr.c:178: Warning: missing closing `"'
kernel/hazptr.c:178: Warning: missing closing `"'
kernel/hazptr.c:178: Warning: missing closing `"'
kernel/hazptr.c:178: Warning: missing closing `"'
kernel/hazptr.c:178: Warning: missing closing `"'
kernel/hazptr.c:178: Warning: missing closing `"'
kernel/hazptr.c:178: Warning: missing closing `"'
kernel/hazptr.c:178: Warning: missing closing `"'
kernel/hazptr.c:178: Warning: missing closing `"'
kernel/hazptr.c:178: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
kernel/hazptr.c:183: Warning: missing closing `"'
vim +178 kernel/hazptr.c
154
155 /*
156 * hazptr_synchronize: Wait until @addr is released from all slots.
157 *
158 * Wait to observe that each slot contains a value that differs from
159 * @addr before returning.
160 * Should be called from preemptible context.
161 */
162 void hazptr_synchronize(void *addr)
163 {
164 int cpu;
165
166 /*
167 * Busy-wait should only be done from preemptible context.
168 */
169 lockdep_assert_preemption_enabled();
170
171 /*
172 * Store A precedes hazptr_scan(): it unpublishes addr (sets it to
173 * NULL or to a different value), and thus hides it from hazard
174 * pointer readers.
175 */
176 if (!addr)
177 return;
> 178 /* Memory ordering: Store A before Load B. */
179 smp_mb();
180 /* Scan all CPUs slots. */
181 for_each_possible_cpu(cpu) {
182 struct hazptr_overflow_list_flip *overflow_list_flip = per_cpu_ptr(&percpu_overflow_list_flip, cpu);
183 unsigned int scan_idx;
184
185 /* Scan CPU slots. */
186 hazptr_synchronize_cpu_slots(cpu, addr);
187
188 /*
189 * Scan backup slots in percpu overflow lists.
190 * Forward progress is guaranteed by scanning one list
191 * while new elements are added into the other list.
192 */
193 guard(mutex)(&overflow_list_flip->lock);
194 scan_idx = overflow_list_flip->add_idx ^ 1;
195 hazptr_synchronize_overflow_list(&overflow_list_flip->array[scan_idx], addr);
196 /* Flip current list. */
197 WRITE_ONCE(overflow_list_flip->add_idx, scan_idx);
198 hazptr_synchronize_overflow_list(&overflow_list_flip->array[scan_idx ^ 1], addr);
199 }
200 }
201 EXPORT_SYMBOL_GPL(hazptr_synchronize);
202
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [linux-next:master 7183/13846] kernel/hazptr.c:178: Warning: missing closing `"'
2026-08-08 0:58 [linux-next:master 7183/13846] kernel/hazptr.c:178: Warning: missing closing `"' kernel test robot
@ 2026-08-08 5:26 ` Paul E. McKenney
0 siblings, 0 replies; 2+ messages in thread
From: Paul E. McKenney @ 2026-08-08 5:26 UTC (permalink / raw)
To: kernel test robot; +Cc: Mathieu Desnoyers, oe-kbuild-all
On Sat, Aug 08, 2026 at 08:58:42AM +0800, kernel test robot wrote:
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> head: 6b8c8af514d739d0335f5579b585e02babe8a727
> commit: 9d30872a4c09c2e8a97084ef1fe6913f6bf9e34d [7183/13846] hazptr: Implement Hazard Pointers
> config: s390-randconfig-001-20260808 (https://download.01.org/0day-ci/archive/20260808/202608080824.VRQz4FGl-lkp@intel.com/config)
> compiler: s390-linux-gcc (GCC) 8.5.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260808/202608080824.VRQz4FGl-lkp@intel.com/reproduce)
>
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@intel.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202608080824.VRQz4FGl-lkp@intel.com/
>
> All warnings (new ones prefixed by >>):
>
> kernel/hazptr.c: Assembler messages:
> >> kernel/hazptr.c:178: Warning: missing closing `"'
> >> kernel/hazptr.c:178: Warning: missing closing `"'
> >> kernel/hazptr.c:178: Warning: missing closing `"'
> >> kernel/hazptr.c:178: Warning: missing closing `"'
> >> kernel/hazptr.c:178: Warning: missing closing `"'
> >> kernel/hazptr.c:178: Warning: missing closing `"'
> >> kernel/hazptr.c:178: Warning: missing closing `"'
> >> kernel/hazptr.c:178: Warning: missing closing `"'
> >> kernel/hazptr.c:178: Warning: missing closing `"'
> >> kernel/hazptr.c:178: Warning: missing closing `"'
> >> kernel/hazptr.c:178: Warning: missing closing `"'
> >> kernel/hazptr.c:178: Warning: missing closing `"'
> >> kernel/hazptr.c:178: Warning: missing closing `"'
> >> kernel/hazptr.c:178: Warning: missing closing `"'
> >> kernel/hazptr.c:178: Warning: missing closing `"'
> >> kernel/hazptr.c:178: Warning: missing closing `"'
> >> kernel/hazptr.c:178: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> >> kernel/hazptr.c:178: Warning: missing closing `"'
> >> kernel/hazptr.c:178: Warning: missing closing `"'
> >> kernel/hazptr.c:178: Warning: missing closing `"'
> kernel/hazptr.c:178: Warning: missing closing `"'
> kernel/hazptr.c:178: Warning: missing closing `"'
> kernel/hazptr.c:178: Warning: missing closing `"'
> kernel/hazptr.c:178: Warning: missing closing `"'
> kernel/hazptr.c:178: Warning: missing closing `"'
> kernel/hazptr.c:178: Warning: missing closing `"'
> kernel/hazptr.c:178: Warning: missing closing `"'
> kernel/hazptr.c:178: Warning: missing closing `"'
> kernel/hazptr.c:178: Warning: missing closing `"'
> kernel/hazptr.c:178: Warning: missing closing `"'
> kernel/hazptr.c:178: Warning: missing closing `"'
> kernel/hazptr.c:178: Warning: missing closing `"'
> kernel/hazptr.c:178: Warning: missing closing `"'
> kernel/hazptr.c:178: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
> kernel/hazptr.c:183: Warning: missing closing `"'
>
>
> vim +178 kernel/hazptr.c
>
> 154
> 155 /*
> 156 * hazptr_synchronize: Wait until @addr is released from all slots.
> 157 *
> 158 * Wait to observe that each slot contains a value that differs from
> 159 * @addr before returning.
> 160 * Should be called from preemptible context.
> 161 */
> 162 void hazptr_synchronize(void *addr)
> 163 {
> 164 int cpu;
> 165
> 166 /*
> 167 * Busy-wait should only be done from preemptible context.
> 168 */
> 169 lockdep_assert_preemption_enabled();
> 170
> 171 /*
> 172 * Store A precedes hazptr_scan(): it unpublishes addr (sets it to
> 173 * NULL or to a different value), and thus hides it from hazard
> 174 * pointer readers.
> 175 */
> 176 if (!addr)
> 177 return;
> > 178 /* Memory ordering: Store A before Load B. */
Is this perhaps a typo in s390 smp_mb() or similar? I freely confess
that I am having trouble seeing how the above comment causes trouble.
Thanx, Paul
> 179 smp_mb();
> 180 /* Scan all CPUs slots. */
> 181 for_each_possible_cpu(cpu) {
> 182 struct hazptr_overflow_list_flip *overflow_list_flip = per_cpu_ptr(&percpu_overflow_list_flip, cpu);
> 183 unsigned int scan_idx;
> 184
> 185 /* Scan CPU slots. */
> 186 hazptr_synchronize_cpu_slots(cpu, addr);
> 187
> 188 /*
> 189 * Scan backup slots in percpu overflow lists.
> 190 * Forward progress is guaranteed by scanning one list
> 191 * while new elements are added into the other list.
> 192 */
> 193 guard(mutex)(&overflow_list_flip->lock);
> 194 scan_idx = overflow_list_flip->add_idx ^ 1;
> 195 hazptr_synchronize_overflow_list(&overflow_list_flip->array[scan_idx], addr);
> 196 /* Flip current list. */
> 197 WRITE_ONCE(overflow_list_flip->add_idx, scan_idx);
> 198 hazptr_synchronize_overflow_list(&overflow_list_flip->array[scan_idx ^ 1], addr);
> 199 }
> 200 }
> 201 EXPORT_SYMBOL_GPL(hazptr_synchronize);
> 202
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki
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2026-08-08 0:58 [linux-next:master 7183/13846] kernel/hazptr.c:178: Warning: missing closing `"' kernel test robot
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