Re: [PATCH] sched/isolation: isolate from handling managed interrupt

[kbuild test robot]

Hi Ming,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on tip/auto-latest]
[also build test ERROR on linux/master tip/irq/core tip/sched/core linus/master v5.5-rc6 next-20200117]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Ming-Lei/sched-isolation-isolate-from-handling-managed-interrupt/20200117-150600
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 9be5556beac21234216feb91225e4a09a7cf6a98
config: s390-randconfig-a001-20200117 (attached as .config)
compiler: s390-linux-gcc (GCC) 7.5.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=7.5.0 make.cross ARCH=s390 

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

All error/warnings (new ones prefixed by >>):

   kernel//irq/manage.c: In function 'irq_do_set_affinity':
>> kernel//irq/manage.c:219:27: error: invalid initializer
     cpumask_var_t tmp_mask = (struct cpumask *)mask;
                              ^
>> kernel//irq/manage.c:234:37: warning: the address of 'tmp_mask' will always evaluate as 'true' [-Waddress]
     if (irqd_affinity_is_managed(data) && tmp_mask &&
                                        ^~

vim +234 kernel//irq/manage.c

   210	
   211	int irq_do_set_affinity(struct irq_data *data, const struct cpumask *mask,
   212				bool force)
   213	{
   214		struct irq_desc *desc = irq_data_to_desc(data);
   215		struct irq_chip *chip = irq_data_get_irq_chip(data);
   216		const struct cpumask *housekeeping_mask =
   217			housekeeping_cpumask(HK_FLAG_MANAGED_IRQ);
   218		int ret;
 > 219		cpumask_var_t tmp_mask = (struct cpumask *)mask;
   220	
   221		if (!chip || !chip->irq_set_affinity)
   222			return -EINVAL;
   223	
   224		zalloc_cpumask_var(&tmp_mask, GFP_ATOMIC);
   225	
   226		/*
   227		 * Userspace can't change managed irq's affinity, make sure that
   228		 * isolated CPU won't be selected as the effective CPU if this
   229		 * irq's affinity includes at least one housekeeping CPU.
   230		 *
   231		 * This way guarantees that isolated CPU won't be interrupted if
   232		 * IO isn't submitted from isolated CPU.
   233		 */
 > 234		if (irqd_affinity_is_managed(data) && tmp_mask &&
   235				cpumask_intersects(mask, housekeeping_mask))
   236			cpumask_and(tmp_mask, mask, housekeeping_mask);
   237	
   238		ret = chip->irq_set_affinity(data, tmp_mask, force);
   239		switch (ret) {
   240		case IRQ_SET_MASK_OK:
   241		case IRQ_SET_MASK_OK_DONE:
   242			cpumask_copy(desc->irq_common_data.affinity, mask);
   243			/* fall through */
   244		case IRQ_SET_MASK_OK_NOCOPY:
   245			irq_validate_effective_affinity(data);
   246			irq_set_thread_affinity(desc);
   247			ret = 0;
   248		}
   249	
   250		free_cpumask_var(tmp_mask);
   251	
   252		return ret;
   253	}
   254	

---
0-DAY kernel test infrastructure                 Open Source Technology Center
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