linux-kernel - Re: [PATCH V2 3/5] genirq/affinity: move actual irq vector spread into one helper

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Date:   Tue, 6 Mar 2018 00:28:32 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     kbuild-all@...org, Jens Axboe <axboe@...nel.dk>,
        Christoph Hellwig <hch@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        Laurence Oberman <loberman@...hat.com>,
        Ming Lei <ming.lei@...hat.com>
Subject: Re: [PATCH V2 3/5] genirq/affinity: move actual irq vector spread
 into one helper

Hi Ming,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on tip/irq/core]
[also build test WARNING on v4.16-rc4 next-20180305]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Ming-Lei/genirq-affinity-irq-vector-spread-among-online-CPUs-as-far-as-possible/20180305-184912
config: i386-randconfig-a1-201809 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   kernel/irq/affinity.c: In function 'irq_create_affinity_masks':
>> kernel/irq/affinity.c:201:50: warning: passing argument 3 of 'irq_build_affinity_masks' from incompatible pointer type
     curvec += irq_build_affinity_masks(nvecs, affd, node_to_cpumask,
                                                     ^
   kernel/irq/affinity.c:97:12: note: expected 'const struct cpumask (*)[1]' but argument is of type 'struct cpumask (*)[1]'
    static int irq_build_affinity_masks(int nvecs, const struct irq_affinity *affd,
               ^

vim +/irq_build_affinity_masks +201 kernel/irq/affinity.c

   161	
   162	/**
   163	 * irq_create_affinity_masks - Create affinity masks for multiqueue spreading
   164	 * @nvecs:	The total number of vectors
   165	 * @affd:	Description of the affinity requirements
   166	 *
   167	 * Returns the masks pointer or NULL if allocation failed.
   168	 */
   169	struct cpumask *
   170	irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd)
   171	{
   172		int curvec;
   173		struct cpumask *masks;
   174		cpumask_var_t nmsk, *node_to_cpumask;
   175	
   176		/*
   177		 * If there aren't any vectors left after applying the pre/post
   178		 * vectors don't bother with assigning affinity.
   179		 */
   180		if (nvecs == affd->pre_vectors + affd->post_vectors)
   181			return NULL;
   182	
   183		if (!zalloc_cpumask_var(&nmsk, GFP_KERNEL))
   184			return NULL;
   185	
   186		masks = kcalloc(nvecs, sizeof(*masks), GFP_KERNEL);
   187		if (!masks)
   188			goto out;
   189	
   190		node_to_cpumask = alloc_node_to_cpumask();
   191		if (!node_to_cpumask)
   192			goto out;
   193	
   194		/* Fill out vectors at the beginning that don't need affinity */
   195		for (curvec = 0; curvec < affd->pre_vectors; curvec++)
   196			cpumask_copy(masks + curvec, irq_default_affinity);
   197	
   198		/* Stabilize the cpumasks */
   199		get_online_cpus();
   200		build_node_to_cpumask(node_to_cpumask);
 > 201		curvec += irq_build_affinity_masks(nvecs, affd, node_to_cpumask,
   202						   cpu_possible_mask, nmsk, masks);
   203		put_online_cpus();
   204	
   205		/* Fill out vectors at the end that don't need affinity */
   206		for (; curvec < nvecs; curvec++)
   207			cpumask_copy(masks + curvec, irq_default_affinity);
   208		free_node_to_cpumask(node_to_cpumask);
   209	out:
   210		free_cpumask_var(nmsk);
   211		return masks;
   212	}
   213	

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