[linux-next:master 7183/13846] kernel/hazptr.c:178: Warning: missing closing `"'

kernel test robot <[email protected]>
Newsgroups dev.linux.lists.oe-kbuild-all
Message-ID <[email protected]>
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/[email protected]/config)
compiler: s390-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260808/[email protected]/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 <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

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	

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