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: <202011290211.VQEqAhn6-lkp@intel.com>
Date:   Sun, 29 Nov 2020 02:14:15 +0800
From:   kernel 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:   c84e1efae022071a4fcf9f1899bf71777c49943a
commit: 4104a562e0ca62e971089db9d3c47794a0d7d4eb sched/core: Annotate curr pointer in rq with __rcu
date:   10 months ago
config: x86_64-randconfig-s031-20201129 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.3-151-g540c2c4b-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4104a562e0ca62e971089db9d3c47794a0d7d4eb
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 4104a562e0ca62e971089db9d3c47794a0d7d4eb
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 

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/livepatch/transition.c: note: in included file:
>> 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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Download attachment ".config.gz" of type "application/gzip" (31126 bytes)