[linux-next:master 5737/10502] drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:6360:13: warning: stack frame size of 2064 bytes in function 'mlxsw_sp_router_fib_event_work'

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

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   bfd521e1af519bb7096efc845f6a64a7de28c472
commit: c0351b7c25ffd52408c1297fbe552f185d5aac3f [5737/10502] mlxsw: spectrum_router: Set FIB entry's type based on nexthop group
config: powerpc64-randconfig-r032-20201203 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 32c501dd88b62787d3a5ffda7aabcf4650dbe3cd)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install powerpc64 cross compiling tool for clang build
        # apt-get install binutils-powerpc64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=c0351b7c25ffd52408c1297fbe552f185d5aac3f
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout c0351b7c25ffd52408c1297fbe552f185d5aac3f
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64 

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

All warnings (new ones prefixed by >>):

>> drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:6360:13: warning: stack frame size of 2064 bytes in function 'mlxsw_sp_router_fib_event_work' [-Wframe-larger-than=]
   static void mlxsw_sp_router_fib_event_work(struct work_struct *work)
               ^
   1 warning generated.

vim +/mlxsw_sp_router_fib_event_work +6360 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c

d42b0965b1d4fe0 Yotam Gigi 2017-09-27  6359  
c1b290d594a12b4 Jiri Pirko 2020-11-10 @6360  static void mlxsw_sp_router_fib_event_work(struct work_struct *work)
c1b290d594a12b4 Jiri Pirko 2020-11-10  6361  {
c1b290d594a12b4 Jiri Pirko 2020-11-10  6362  	struct mlxsw_sp_router *router = container_of(work, struct mlxsw_sp_router, fib_event_work);
91d20d71b2f0b1e Jiri Pirko 2020-11-10  6363  	struct mlxsw_sp_fib_entry_op_ctx *op_ctx = router->ll_op_ctx;
c1b290d594a12b4 Jiri Pirko 2020-11-10  6364  	struct mlxsw_sp *mlxsw_sp = router->mlxsw_sp;
505cd65c66e8223 Jiri Pirko 2020-11-10  6365  	struct mlxsw_sp_fib_event *next_fib_event;
505cd65c66e8223 Jiri Pirko 2020-11-10  6366  	struct mlxsw_sp_fib_event *fib_event;
91d20d71b2f0b1e Jiri Pirko 2020-11-10  6367  	int last_family = AF_UNSPEC;
c1b290d594a12b4 Jiri Pirko 2020-11-10  6368  	LIST_HEAD(fib_event_queue);
c1b290d594a12b4 Jiri Pirko 2020-11-10  6369  
c1b290d594a12b4 Jiri Pirko 2020-11-10  6370  	spin_lock_bh(&router->fib_event_queue_lock);
c1b290d594a12b4 Jiri Pirko 2020-11-10  6371  	list_splice_init(&router->fib_event_queue, &fib_event_queue);
c1b290d594a12b4 Jiri Pirko 2020-11-10  6372  	spin_unlock_bh(&router->fib_event_queue_lock);
c1b290d594a12b4 Jiri Pirko 2020-11-10  6373  
91d20d71b2f0b1e Jiri Pirko 2020-11-10  6374  	/* Router lock is held here to make sure per-instance
91d20d71b2f0b1e Jiri Pirko 2020-11-10  6375  	 * operation context is not used in between FIB4/6 events
91d20d71b2f0b1e Jiri Pirko 2020-11-10  6376  	 * processing.
91d20d71b2f0b1e Jiri Pirko 2020-11-10  6377  	 */
91d20d71b2f0b1e Jiri Pirko 2020-11-10  6378  	mutex_lock(&router->lock);
91d20d71b2f0b1e Jiri Pirko 2020-11-10  6379  	mlxsw_sp_fib_entry_op_ctx_clear(op_ctx);
505cd65c66e8223 Jiri Pirko 2020-11-10  6380  	list_for_each_entry_safe(fib_event, next_fib_event,
505cd65c66e8223 Jiri Pirko 2020-11-10  6381  				 &fib_event_queue, list) {
505cd65c66e8223 Jiri Pirko 2020-11-10  6382  		/* Check if the next entry in the queue exists and it is
505cd65c66e8223 Jiri Pirko 2020-11-10  6383  		 * of the same type (family and event) as the currect one.
505cd65c66e8223 Jiri Pirko 2020-11-10  6384  		 * In that case it is permitted to do the bulking
505cd65c66e8223 Jiri Pirko 2020-11-10  6385  		 * of multiple FIB entries to a single register write.
505cd65c66e8223 Jiri Pirko 2020-11-10  6386  		 */
91d20d71b2f0b1e Jiri Pirko 2020-11-10  6387  		op_ctx->bulk_ok = !list_is_last(&fib_event->list, &fib_event_queue) &&
505cd65c66e8223 Jiri Pirko 2020-11-10  6388  				  fib_event->family == next_fib_event->family &&
505cd65c66e8223 Jiri Pirko 2020-11-10  6389  				  fib_event->event == next_fib_event->event;
505cd65c66e8223 Jiri Pirko 2020-11-10  6390  
91d20d71b2f0b1e Jiri Pirko 2020-11-10  6391  		/* In case family of this and the previous entry are different, context
91d20d71b2f0b1e Jiri Pirko 2020-11-10  6392  		 * reinitialization is going to be needed now, indicate that.
91d20d71b2f0b1e Jiri Pirko 2020-11-10  6393  		 * Note that since last_family is initialized to AF_UNSPEC, this is always
91d20d71b2f0b1e Jiri Pirko 2020-11-10  6394  		 * going to happen for the first entry processed in the work.
91d20d71b2f0b1e Jiri Pirko 2020-11-10  6395  		 */
91d20d71b2f0b1e Jiri Pirko 2020-11-10  6396  		if (fib_event->family != last_family)
91d20d71b2f0b1e Jiri Pirko 2020-11-10  6397  			op_ctx->initialized = false;
91d20d71b2f0b1e Jiri Pirko 2020-11-10  6398  
c1b290d594a12b4 Jiri Pirko 2020-11-10  6399  		switch (fib_event->family) {
c1b290d594a12b4 Jiri Pirko 2020-11-10  6400  		case AF_INET:
91d20d71b2f0b1e Jiri Pirko 2020-11-10  6401  			mlxsw_sp_router_fib4_event_process(mlxsw_sp, op_ctx,
2d5bd7a111ca082 Jiri Pirko 2020-11-10  6402  							   fib_event);
c1b290d594a12b4 Jiri Pirko 2020-11-10  6403  			break;
c1b290d594a12b4 Jiri Pirko 2020-11-10  6404  		case AF_INET6:
91d20d71b2f0b1e Jiri Pirko 2020-11-10  6405  			mlxsw_sp_router_fib6_event_process(mlxsw_sp, op_ctx,
2d5bd7a111ca082 Jiri Pirko 2020-11-10  6406  							   fib_event);
c1b290d594a12b4 Jiri Pirko 2020-11-10  6407  			break;
c1b290d594a12b4 Jiri Pirko 2020-11-10  6408  		case RTNL_FAMILY_IP6MR:
c1b290d594a12b4 Jiri Pirko 2020-11-10  6409  		case RTNL_FAMILY_IPMR:
91d20d71b2f0b1e Jiri Pirko 2020-11-10  6410  			/* Unlock here as inside FIBMR the lock is taken again
91d20d71b2f0b1e Jiri Pirko 2020-11-10  6411  			 * under RTNL. The per-instance operation context
91d20d71b2f0b1e Jiri Pirko 2020-11-10  6412  			 * is not used by FIBMR.
91d20d71b2f0b1e Jiri Pirko 2020-11-10  6413  			 */
91d20d71b2f0b1e Jiri Pirko 2020-11-10  6414  			mutex_unlock(&router->lock);
c1b290d594a12b4 Jiri Pirko 2020-11-10  6415  			mlxsw_sp_router_fibmr_event_process(mlxsw_sp,
c1b290d594a12b4 Jiri Pirko 2020-11-10  6416  							    fib_event);
91d20d71b2f0b1e Jiri Pirko 2020-11-10  6417  			mutex_lock(&router->lock);
c1b290d594a12b4 Jiri Pirko 2020-11-10  6418  			break;
c1b290d594a12b4 Jiri Pirko 2020-11-10  6419  		default:
c1b290d594a12b4 Jiri Pirko 2020-11-10  6420  			WARN_ON_ONCE(1);
c1b290d594a12b4 Jiri Pirko 2020-11-10  6421  		}
91d20d71b2f0b1e Jiri Pirko 2020-11-10  6422  		last_family = fib_event->family;
c1b290d594a12b4 Jiri Pirko 2020-11-10  6423  		kfree(fib_event);
c1b290d594a12b4 Jiri Pirko 2020-11-10  6424  		cond_resched();
c1b290d594a12b4 Jiri Pirko 2020-11-10  6425  	}
ae9ce81aa726efb Jiri Pirko 2020-11-10  6426  	WARN_ON_ONCE(!list_empty(&router->ll_op_ctx->fib_entry_priv_list));
91d20d71b2f0b1e Jiri Pirko 2020-11-10  6427  	mutex_unlock(&router->lock);
c1b290d594a12b4 Jiri Pirko 2020-11-10  6428  }
c1b290d594a12b4 Jiri Pirko 2020-11-10  6429  

:::::: The code at line 6360 was first introduced by commit
:::::: c1b290d594a12b4ed3b7386947162d5a061900b2 mlxsw: spectrum_router: Introduce FIB event queue instead of separate works

:::::: TO: Jiri Pirko <jiri@nvidia.com>
:::::: CC: Jakub Kicinski <kuba@kernel.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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