linux-kernel - Re: [RESEND PATCH v11 1/2] sched/deadline: Add support for SD_PREFER_SIBLING on find_later

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Date:   Thu, 11 Jan 2018 01:22:08 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Byungchul Park <byungchul.park@....com>
Cc:     kbuild-all@...org, peterz@...radead.org, mingo@...nel.org,
        rostedt@...dmis.org, tglx@...utronix.de, raistlin@...ux.it,
        linux-kernel@...r.kernel.org, juri.lelli@...il.com,
        bristot@...hat.com, kernel-team@....com
Subject: Re: [RESEND PATCH v11 1/2] sched/deadline: Add support for
 SD_PREFER_SIBLING on find_later_rq()

Hi Byungchul,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on tip/sched/core]
[also build test WARNING on v4.15-rc7 next-20180110]
[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/Byungchul-Park/sched-deadline-Add-support-for-SD_PREFER_SIBLING-on-find_later_rq/20180110-225946
reproduce:
        # apt-get install sparse
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

   kernel/sched/sched.h:2104:16: sparse: incompatible types in comparison expression (different address spaces)
   kernel/sched/sched.h:2104:16: sparse: incompatible types in comparison expression (different address spaces)
   kernel/sched/sched.h:2104:16: sparse: incompatible types in comparison expression (different address spaces)
   kernel/sched/sched.h:2104:16: sparse: incompatible types in comparison expression (different address spaces)
   kernel/sched/sched.h:2104:16: sparse: incompatible types in comparison expression (different address spaces)
   kernel/sched/sched.h:2104:16: sparse: incompatible types in comparison expression (different address spaces)
   kernel/sched/sched.h:2104:16: sparse: incompatible types in comparison expression (different address spaces)
   kernel/sched/sched.h:2104:16: sparse: incompatible types in comparison expression (different address spaces)
   kernel/sched/deadline.c:1124:5: sparse: symbol 'grub_reclaim' was not declared. Should it be
   kernel/sched/sched.h:2104:16: sparse: incompatible types in comparison expression (different address spaces)
   kernel/sched/sched.h:2104:16: sparse: incompatible types in comparison expression (different address spaces)
   kernel/sched/sched.h:2104:16: sparse: incompatible types in comparison expression (different address spaces)
   kernel/sched/deadline.c:1916:9: sparse: incompatible types in comparison expression (different address spaces)
   kernel/sched/sched.h:2104:16: sparse: incompatible types in comparison expression (different address spaces)
>> kernel/sched/deadline.c:1857:55: sparse: incorrect type in argument 1 (different modifiers) @@ expected struct sched_domain @@ got structstruct sched_domain @@
   kernel/sched/deadline.c:1857:55: expected struct sched_domain
   kernel/sched/deadline.c:1857:55: got struct sched_domain const
   kernel/sched/deadline.c:1858:64: sparse: incorrect type in argument 1 (different modifiers) @@ expected struct sched_domain @@ got structstruct sched_domain @@
   kernel/sched/deadline.c:1858:64: expected struct sched_domain
   kernel/sched/deadline.c:1858:64: got struct sched_domain const
   kernel/sched/deadline.c:563:9: sparse: context imbalance in 'dl_task_offline_migration' - unexpected unlock
   kernel/sched/deadline.c:2060:9: sparse: context imbalance in 'find_lock_later_rq' - different lock contexts for basic block
   kernel/sched/deadline.c:2155:23: sparse: context imbalance in 'push_dl_task' - unexpected unlock
   kernel/sched/sched.h:1856:17: sparse: context imbalance in 'pull_dl_task' - unexpected unlock
   kernel/sched/deadline.c: In function 'find_cpu':
   kernel/sched/deadline.c:1857:48: warning: passing argument 1 of 'sched_domain_span' discards 'const' qualifier from pointer target type
    const struct cpumask = sched_domain_span(sd);
    ^~
   In file included from kernel/sched/sched.h:6:0,
    from kernel/sched/deadline.c:18:
   include/linux/sched/topology.h:160:31: note: expected 'struct sched_domain but argument is of type 'const struct sched_domain
    static inline struct cpumask sched_domain
    ^~~~~~~~~~~~~~~~~
   kernel/sched/deadline.c:1858:57: warning: passing argument 1 of 'sched_domain_span' discards 'const' qualifier from pointer target type
    const struct cpumask = prefer sched_domain_span(prefer) : NULL;
    ^~~~~~
   In file included from kernel/sched/sched.h:6:0,
    from kernel/sched/deadline.c:18:
   include/linux/sched/topology.h:160:31: note: expected 'struct sched_domain but argument is of type 'const struct sched_domain
    static inline struct cpumask sched_domain
    ^~~~~~~~~~~~~~~~~

vim +1857 kernel/sched/deadline.c

  1849	
  1850	/*
  1851	 * Find the first cpu in: mask & sd & ~prefer
  1852	 */
  1853	static int find_cpu(const struct cpumask *mask,
  1854			    const struct sched_domain *sd,
  1855			    const struct sched_domain *prefer)
  1856	{
> 1857		const struct cpumask *sds = sched_domain_span(sd);
  1858		const struct cpumask *ps  = prefer ? sched_domain_span(prefer) : NULL;
  1859		int cpu;
  1860	
  1861		for_each_cpu(cpu, mask) {
  1862			if (!cpumask_test_cpu(cpu, sds))
  1863				continue;
  1864			if (ps && cpumask_test_cpu(cpu, ps))
  1865				continue;
  1866			break;
  1867		}
  1868	
  1869		return cpu;
  1870	}
  1871	

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