linux-kernel - [mingo-tip:sched/headers 90/2574] kernel/sched/deadline.c:1883:50: sparse: sparse: cast removes address space '_

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Date:   Mon, 21 Feb 2022 11:44:14 +0800
From:   kernel test robot <lkp@...el.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [mingo-tip:sched/headers 90/2574] kernel/sched/deadline.c:1883:50:
 sparse: sparse: cast removes address space '__rcu' of expression

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git sched/headers
head:   39e8a0edc8fae20758051dadf7846849edc18b88
commit: d58c0a66fcb697b448eee902e4d8faa3ebe21c0d [90/2574] headers/deps: sched/deadline: Move task->dl to per_task
config: sparc64-randconfig-s031-20220220 (https://download.01.org/0day-ci/archive/20220221/202202211135.6YTPVoRB-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 11.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git/commit/?id=d58c0a66fcb697b448eee902e4d8faa3ebe21c0d
        git remote add mingo-tip git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git
        git fetch --no-tags mingo-tip sched/headers
        git checkout d58c0a66fcb697b448eee902e4d8faa3ebe21c0d
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=sparc64 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>


sparse warnings: (new ones prefixed by >>)
>> kernel/sched/deadline.c:1883:50: sparse: sparse: cast removes address space '__rcu' of expression
   kernel/sched/deadline.c:1114:23: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected struct task_struct *p @@     got struct task_struct [noderef] __rcu *curr @@
   kernel/sched/deadline.c:1114:23: sparse:     expected struct task_struct *p
   kernel/sched/deadline.c:1114:23: sparse:     got struct task_struct [noderef] __rcu *curr
   kernel/sched/deadline.c:1243:38: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected struct task_struct *curr @@     got struct task_struct [noderef] __rcu *curr @@
   kernel/sched/deadline.c:1243:38: sparse:     expected struct task_struct *curr
   kernel/sched/deadline.c:1243:38: sparse:     got struct task_struct [noderef] __rcu *curr
   kernel/sched/deadline.c:1738:9: sparse: sparse: cast removes address space '__rcu' of expression
   kernel/sched/deadline.c:2587:22: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/deadline.c:2587:22: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/deadline.c:2587:22: sparse:    struct task_struct *
   kernel/sched/deadline.c:1142:24: sparse: sparse: context imbalance in 'dl_task_timer' - wrong count at exit
   kernel/sched/deadline.c:1383:24: sparse: sparse: context imbalance in 'inactive_task_timer' - wrong count at exit
   kernel/sched/deadline.c: note: in included file:
   kernel/sched/sched.h:2036:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2036:25: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2036:25: sparse:    struct task_struct *
   kernel/sched/sched.h:2036:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2036:25: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2036:25: sparse:    struct task_struct *

vim +/__rcu +1883 kernel/sched/deadline.c

  1875	
  1876	/*
  1877	 * Only called when both the current and waking task are -deadline
  1878	 * tasks.
  1879	 */
  1880	static void check_preempt_curr_dl(struct rq *rq, struct task_struct *p,
  1881					  int flags)
  1882	{
> 1883		if (dl_entity_preempt(&per_task(p, dl), &per_task(rq->curr, dl))) {
  1884			resched_curr(rq);
  1885			return;
  1886		}
  1887	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org