[jlayton:pool-mode 6/6] net/sunrpc/svc.c:235:39: sparse: sparse: dereference of noderef expression

[jlayton:pool-mode 6/6] net/sunrpc/svc.c:235:39: sparse: sparse: dereference of noderef expression

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux.git pool-mode
head:   cdfad06a7ec5f3b374eac6e7614134474ca39c2b
commit: cdfad06a7ec5f3b374eac6e7614134474ca39c2b [6/6] sunrpc: protect the svc_pool_map pool_to[] array with RCU
config: sparc-randconfig-r132-20260630 (https://download.01.org/0day-ci/archive/20260630/202606301410.EvwcD3VP-lkp@intel.com/config)
compiler: sparc-linux-gcc (GCC) 8.5.0
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260630/202606301410.EvwcD3VP-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202606301410.EvwcD3VP-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> net/sunrpc/svc.c:235:39: sparse: sparse: dereference of noderef expression

vim +235 net/sunrpc/svc.c

d8903ab12c8e90 Jeff Layton           2026-04-23  226  
bfd241600a3b0d Greg Banks            2006-10-02  227  /*
9867d76ca16b3f Jeff Layton           2008-06-10  228   * Set the given thread's cpus_allowed mask so that it
bfd241600a3b0d Greg Banks            2006-10-02  229   * will only run on cpus in the given pool.
bfd241600a3b0d Greg Banks            2006-10-02  230   */
9867d76ca16b3f Jeff Layton           2008-06-10  231  static inline void
9867d76ca16b3f Jeff Layton           2008-06-10  232  svc_pool_map_set_cpumask(struct task_struct *task, unsigned int pidx)
bfd241600a3b0d Greg Banks            2006-10-02  233  {
bfd241600a3b0d Greg Banks            2006-10-02  234  	struct svc_pool_map *m = &svc_pool_map;
9867d76ca16b3f Jeff Layton           2008-06-10 @235  	unsigned int node = m->pool_to[pidx];
bfd241600a3b0d Greg Banks            2006-10-02  236  
bfd241600a3b0d Greg Banks            2006-10-02  237  	/*
bfd241600a3b0d Greg Banks            2006-10-02  238  	 * The caller checks for sv_nrpools > 1, which
42a7fc4a659822 Greg Banks            2007-03-06  239  	 * implies that we've been initialized.
bfd241600a3b0d Greg Banks            2006-10-02  240  	 */
1bd58aaff44485 Weston Andros Adamson 2012-10-23  241  	WARN_ON_ONCE(m->count == 0);
1bd58aaff44485 Weston Andros Adamson 2012-10-23  242  	if (m->count == 0)
1bd58aaff44485 Weston Andros Adamson 2012-10-23  243  		return;
bfd241600a3b0d Greg Banks            2006-10-02  244  
a70f730282019f Rusty Russell         2009-03-13  245  	set_cpus_allowed_ptr(task, cpumask_of_node(node));
c5f59f0833df94 Mike Travis           2008-04-04  246  }
bfd241600a3b0d Greg Banks            2006-10-02  247  

:::::: The code at line 235 was first introduced by commit
:::::: 9867d76ca16b3f455f9ca83861f4ce5c94a25928 knfsd: convert knfsd to kthread API

:::::: TO: Jeff Layton <jlayton@redhat.com>
:::::: CC: J. Bruce Fields <bfields@citi.umich.edu>

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