netdev - Re: [PATCH v2 net-next 4/4] cxgb4: Add MPS refcounting for alloc/free mac filters

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Message-ID: <201906242352.6Hc0gkGk%lkp@intel.com>
Date:   Mon, 24 Jun 2019 23:51:27 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Raju Rangoju <rajur@...lsio.com>
Cc:     kbuild-all@...org, netdev@...r.kernel.org, davem@...emloft.net,
        nirranjan@...lsio.com, dt@...lsio.com, rajur@...lsio.com
Subject: Re: [PATCH v2 net-next 4/4] cxgb4: Add MPS refcounting for
 alloc/free mac filters

Hi Raju,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Raju-Rangoju/cxgb4-Reference-count-MPS-TCAM-entries-within-a-PF/20190624-230630
config: ia64-allmodconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 7.4.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=7.4.0 make.cross ARCH=ia64 

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

All errors (new ones prefixed by >>):

   drivers/net/ethernet/chelsio/cxgb4/cxgb4_mps.c: In function 'cxgb4_mps_ref_dec_by_mac':
>> drivers/net/ethernet/chelsio/cxgb4/cxgb4_mps.c:17:29: error: passing argument 1 of 'atomic_dec_and_test' from incompatible pointer type [-Werror=incompatible-pointer-types]
       if (!atomic_dec_and_test(&mps_entry->refcnt)) {
                                ^
   In file included from include/linux/atomic.h:74:0,
                    from arch/ia64/include/asm/processor.h:79,
                    from arch/ia64/include/asm/thread_info.h:12,
                    from include/linux/thread_info.h:38,
                    from include/asm-generic/preempt.h:5,
                    from ./arch/ia64/include/generated/asm/preempt.h:1,
                    from include/linux/preempt.h:78,
                    from include/linux/hardirq.h:5,
                    from include/linux/interrupt.h:11,
                    from drivers/net/ethernet/chelsio/cxgb4/cxgb4.h:42,
                    from drivers/net/ethernet/chelsio/cxgb4/cxgb4_mps.c:4:
   include/linux/atomic-fallback.h:1031:1: note: expected 'atomic_t * {aka struct <anonymous> *}' but argument is of type 'refcount_t * {aka struct refcount_struct *}'
    atomic_dec_and_test(atomic_t *v)
    ^~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/atomic_dec_and_test +17 drivers/net/ethernet/chelsio/cxgb4/cxgb4_mps.c

     5	
     6	static int cxgb4_mps_ref_dec_by_mac(struct adapter *adap,
     7					    const u8 *addr, const u8 *mask)
     8	{
     9		u8 bitmask[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
    10		struct mps_entries_ref *mps_entry, *tmp;
    11		int ret = -EINVAL;
    12	
    13		spin_lock_bh(&adap->mps_ref_lock);
    14		list_for_each_entry_safe(mps_entry, tmp, &adap->mps_ref, list) {
    15			if (ether_addr_equal(mps_entry->addr, addr) &&
    16			    ether_addr_equal(mps_entry->mask, mask ? mask : bitmask)) {
  > 17				if (!atomic_dec_and_test(&mps_entry->refcnt)) {
    18					spin_unlock_bh(&adap->mps_ref_lock);
    19					return -EBUSY;
    20				}
    21				list_del(&mps_entry->list);
    22				kfree(mps_entry);
    23				ret = 0;
    24				break;
    25			}
    26		}
    27		spin_unlock_bh(&adap->mps_ref_lock);
    28		return ret;
    29	}
    30	

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