linux-kernel - kernel/livepatch/../sched/sched.h:1619:25: sparse: sparse: incompatible types in comparison expression (different address spaces):

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Message-ID: <202005240847.QeA05Zl1%lkp@intel.com>
Date:   Sun, 24 May 2020 08:54:54 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Madhuparna Bhowmik <madhuparnabhowmik10@...il.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...nel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>
Subject: kernel/livepatch/../sched/sched.h:1619:25: sparse: sparse:
 incompatible types in comparison expression (different address spaces):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   0cfc8a8d70dcd51db783e8e87917e02149c71458
commit: 4104a562e0ca62e971089db9d3c47794a0d7d4eb sched/core: Annotate curr pointer in rq with __rcu
date:   3 months ago
config: x86_64-randconfig-s002-20200524 (attached as .config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.1-193-gb8fad4bc-dirty
        git checkout 4104a562e0ca62e971089db9d3c47794a0d7d4eb
        # save the attached .config to linux build tree
        make W=1 C=1 ARCH=x86_64 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'

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


sparse warnings: (new ones prefixed by >>)

>> kernel/livepatch/../sched/sched.h:1619:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
>> kernel/livepatch/../sched/sched.h:1619:25: sparse:    struct task_struct [noderef] <asn:4> *
>> kernel/livepatch/../sched/sched.h:1619:25: sparse:    struct task_struct *

vim +1619 kernel/livepatch/../sched/sched.h

029632fbb7b7c9 kernel/sched.h Peter Zijlstra 2011-10-25  1616  
029632fbb7b7c9 kernel/sched.h Peter Zijlstra 2011-10-25  1617  static inline int task_current(struct rq *rq, struct task_struct *p)
029632fbb7b7c9 kernel/sched.h Peter Zijlstra 2011-10-25  1618  {
029632fbb7b7c9 kernel/sched.h Peter Zijlstra 2011-10-25 @1619  	return rq->curr == p;
029632fbb7b7c9 kernel/sched.h Peter Zijlstra 2011-10-25  1620  }
029632fbb7b7c9 kernel/sched.h Peter Zijlstra 2011-10-25  1621  

:::::: The code at line 1619 was first introduced by commit
:::::: 029632fbb7b7c9d85063cc9eb470de6c54873df3 sched: Make separate sched*.c translation units

:::::: TO: Peter Zijlstra <a.p.zijlstra@...llo.nl>
:::::: CC: Ingo Molnar <mingo@...e.hu>

---
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https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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