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

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Date:   Tue, 25 Jun 2019 01:16:49 +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: x86_64-rhel-7.2 (attached as .config)
compiler: clang version 9.0.0 (git://gitmirror/llvm_project fb2bd4a9398b35ee4f732ea0847d9c1226fc4cf3)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

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:17:29: error: incompatible pointer types passing 'refcount_t *' (aka 'struct refcount_struct *') to parameter of type 'atomic_t *' [-Werror,-Wincompatible-pointer-types]
                           if (!atomic_dec_and_test(&mps_entry->refcnt)) {
                                                    ^~~~~~~~~~~~~~~~~~
   include/asm-generic/atomic-instrumented.h:745:31: note: passing argument to parameter 'v' here
   atomic_dec_and_test(atomic_t *v)
                                 ^
   1 error generated.

vim +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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