Re: [RFC PATCH] rhashtable: Bounce deferred worker kick through irq_work when insecure_elasticity is set

[kernel test robot <lkp@intel.com>]

Hi Tejun,

[This is a private test report for your RFC patch.]
kernel test robot noticed the following build errors:

[auto build test ERROR on v7.0]
[also build test ERROR on linus/master]
[cannot apply to tj-sched-ext/for-7.1-fixes next-20260427]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Tejun-Heo/rhashtable-Bounce-deferred-worker-kick-through-irq_work-when-insecure_elasticity-is-set/20260426-103416
base:   v7.0
patch link:    https://lore.kernel.org/r/67fedbf2-914b-44f7-9422-1fe97d833705%40kernel.org
patch subject: [RFC PATCH] rhashtable: Bounce deferred worker kick through irq_work when insecure_elasticity is set
config: sh-allyesconfig (https://download.01.org/0day-ci/archive/20260428/202604281553.zt7WUfFH-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260428/202604281553.zt7WUfFH-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/202604281553.zt7WUfFH-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from lib/rhashtable.c:25:
   include/linux/rhashtable.h: In function 'rhashtable_kick_deferred_worker':
>> include/linux/rhashtable.h:768:18: error: 'struct rhashtable_params' has no member named 'insecure_elasticity'
     768 |         if (ht->p.insecure_elasticity)
         |                  ^
   lib/rhashtable.c: In function 'rhashtable_init_noprof':
>> lib/rhashtable.c:1095:18: error: 'struct rhashtable_params' has no member named 'insecure_elasticity'
    1095 |         if (ht->p.insecure_elasticity)
         |                  ^
   lib/rhashtable.c: In function 'rhashtable_free_and_destroy':
   lib/rhashtable.c:1162:18: error: 'struct rhashtable_params' has no member named 'insecure_elasticity'
    1162 |         if (ht->p.insecure_elasticity)
         |                  ^
--
   In file included from lib/test_rhashtable.c:20:
   include/linux/rhashtable.h: In function 'rhashtable_kick_deferred_worker':
>> include/linux/rhashtable.h:768:18: error: 'struct rhashtable_params' has no member named 'insecure_elasticity'
     768 |         if (ht->p.insecure_elasticity)
         |                  ^


vim +768 include/linux/rhashtable.h

   757	
   758	/*
   759	 * Kick the deferred rehash worker. With insecure_elasticity the caller may
   760	 * hold a raw spinlock. schedule_work() under a raw spinlock records
   761	 * caller_lock -> pool->lock -> pi_lock -> rq->__lock. If any of these
   762	 * locks is acquired in the reverse direction elsewhere, the cycle closes.
   763	 * Bounce through irq_work so schedule_work() runs from hard IRQ context
   764	 * with the caller's lock no longer held.
   765	 */
   766	static void rhashtable_kick_deferred_worker(struct rhashtable *ht)
   767	{
 > 768		if (ht->p.insecure_elasticity)
   769			irq_work_queue(&ht->run_irq_work);
   770		else
   771			schedule_work(&ht->run_work);
   772	}
   773	

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