linux-kernel - [mingo-tip:sched/headers 127/2579] kernel/sched/fair.c:918:32: sparse: sparse: cast removes address space '_

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Date:   Mon, 25 Apr 2022 05:35:43 +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 127/2579] kernel/sched/fair.c:918:32:
 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:   49e1ec6c70a6eb4b7de9250a455b8b63eb42afbe
commit: c3b487719a9654b07ba650abe5bf9964e5474b69 [127/2579] headers/deps: Move task_struct::se to per_task()
config: i386-randconfig-s001 (https://download.01.org/0day-ci/archive/20220425/202204250519.sArtxmdn-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.2.0-20) 11.2.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git/commit/?id=c3b487719a9654b07ba650abe5bf9964e5474b69
        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 c3b487719a9654b07ba650abe5bf9964e5474b69
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 SHELL=/bin/bash kernel/sched/ mm/ net/ipv4/

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/fair.c:918:32: sparse: sparse: cast removes address space '__rcu' of expression
   kernel/sched/fair.c:5053:22: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/fair.c:5053:22: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/fair.c:5053:22: sparse:    struct task_struct *
   kernel/sched/fair.c:5579:38: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected struct task_struct *curr @@     got struct task_struct [noderef] __rcu *curr @@
   kernel/sched/fair.c:5579:38: sparse:     expected struct task_struct *curr
   kernel/sched/fair.c:5579:38: sparse:     got struct task_struct [noderef] __rcu *curr
   kernel/sched/fair.c:7137:38: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected struct task_struct *curr @@     got struct task_struct [noderef] __rcu *curr @@
   kernel/sched/fair.c:7137:38: sparse:     expected struct task_struct *curr
   kernel/sched/fair.c:7137:38: sparse:     got struct task_struct [noderef] __rcu *curr
   kernel/sched/fair.c:7435:38: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected struct task_struct *curr @@     got struct task_struct [noderef] __rcu *curr @@
   kernel/sched/fair.c:7435:38: sparse:     expected struct task_struct *curr
   kernel/sched/fair.c:7435:38: sparse:     got struct task_struct [noderef] __rcu *curr
   kernel/sched/fair.c:4693:31: sparse: sparse: marked inline, but without a definition
   kernel/sched/fair.c: note: in included file:
   kernel/sched/sched.h:2022:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2022:25: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2022:25: sparse:    struct task_struct *
   kernel/sched/sched.h:2180:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2180:9: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2180:9: sparse:    struct task_struct *
   kernel/sched/sched.h:2022:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2022:25: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2022:25: sparse:    struct task_struct *
   kernel/sched/sched.h:2022:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2022:25: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2022:25: sparse:    struct task_struct *

vim +/__rcu +918 kernel/sched/fair.c

   915	
   916	static void update_curr_fair(struct rq *rq)
   917	{
 > 918		update_curr(cfs_rq_of(&per_task(rq->curr, se)));
   919	}
   920	

-- 
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