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Message-ID: <201802200822.fnk0Np7v%fengguang.wu@intel.com>
Date: Tue, 20 Feb 2018 08:15:26 +0800
From: kbuild test robot <fengguang.wu@...el.com>
To: Alice Michael <alice.michael@...el.com>
Cc: kbuild-all@...org, linux-kernel@...r.kernel.org,
Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: drivers/net//ethernet/intel/i40e/i40e_ethtool.c:4326:6: error:
implicit declaration of function 'cmpxchg64'; did you mean 'cmpxchg'?
Hi Alice,
FYI, the error/warning still remains.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 79c0ef3e85c015b0921a8fd5dd539d1480e9cd6c
commit: 60f481b9703867330dc6010868054f68f6d52f7a i40e: change flags to use 64 bits
date: 3 weeks ago
config: mips-allmodconfig (attached as .config)
compiler: mips-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
git checkout 60f481b9703867330dc6010868054f68f6d52f7a
# save the attached .config to linux build tree
make.cross ARCH=mips
All errors (new ones prefixed by >>):
drivers/net//ethernet/intel/i40e/i40e_ethtool.c: In function 'i40e_set_priv_flags':
>> drivers/net//ethernet/intel/i40e/i40e_ethtool.c:4326:6: error: implicit declaration of function 'cmpxchg64'; did you mean 'cmpxchg'? [-Werror=implicit-function-declaration]
if (cmpxchg64(&pf->flags, orig_flags, new_flags) != orig_flags) {
^~~~~~~~~
cmpxchg
cc1: some warnings being treated as errors
vim +4326 drivers/net//ethernet/intel/i40e/i40e_ethtool.c
4258
4259 /**
4260 * i40e_set_priv_flags - set private flags
4261 * @dev: network interface device structure
4262 * @flags: bit flags to be set
4263 **/
4264 static int i40e_set_priv_flags(struct net_device *dev, u32 flags)
4265 {
4266 struct i40e_netdev_priv *np = netdev_priv(dev);
4267 struct i40e_vsi *vsi = np->vsi;
4268 struct i40e_pf *pf = vsi->back;
4269 u64 orig_flags, new_flags, changed_flags;
4270 u32 i, j;
4271
4272 orig_flags = READ_ONCE(pf->flags);
4273 new_flags = orig_flags;
4274
4275 for (i = 0; i < I40E_PRIV_FLAGS_STR_LEN; i++) {
4276 const struct i40e_priv_flags *priv_flags;
4277
4278 priv_flags = &i40e_gstrings_priv_flags[i];
4279
4280 if (flags & BIT(i))
4281 new_flags |= priv_flags->flag;
4282 else
4283 new_flags &= ~(priv_flags->flag);
4284
4285 /* If this is a read-only flag, it can't be changed */
4286 if (priv_flags->read_only &&
4287 ((orig_flags ^ new_flags) & ~BIT(i)))
4288 return -EOPNOTSUPP;
4289 }
4290
4291 if (pf->hw.pf_id != 0)
4292 goto flags_complete;
4293
4294 for (j = 0; j < I40E_GL_PRIV_FLAGS_STR_LEN; j++) {
4295 const struct i40e_priv_flags *priv_flags;
4296
4297 priv_flags = &i40e_gl_gstrings_priv_flags[j];
4298
4299 if (flags & BIT(i + j))
4300 new_flags |= priv_flags->flag;
4301 else
4302 new_flags &= ~(priv_flags->flag);
4303
4304 /* If this is a read-only flag, it can't be changed */
4305 if (priv_flags->read_only &&
4306 ((orig_flags ^ new_flags) & ~BIT(i)))
4307 return -EOPNOTSUPP;
4308 }
4309
4310 flags_complete:
4311 /* Before we finalize any flag changes, we need to perform some
4312 * checks to ensure that the changes are supported and safe.
4313 */
4314
4315 /* ATR eviction is not supported on all devices */
4316 if ((new_flags & I40E_FLAG_HW_ATR_EVICT_ENABLED) &&
4317 !(pf->hw_features & I40E_HW_ATR_EVICT_CAPABLE))
4318 return -EOPNOTSUPP;
4319
4320 /* Compare and exchange the new flags into place. If we failed, that
4321 * is if cmpxchg returns anything but the old value, this means that
4322 * something else has modified the flags variable since we copied it
4323 * originally. We'll just punt with an error and log something in the
4324 * message buffer.
4325 */
> 4326 if (cmpxchg64(&pf->flags, orig_flags, new_flags) != orig_flags) {
4327 dev_warn(&pf->pdev->dev,
4328 "Unable to update pf->flags as it was modified by another thread...\n");
4329 return -EAGAIN;
4330 }
4331
4332 changed_flags = orig_flags ^ new_flags;
4333
4334 /* Process any additional changes needed as a result of flag changes.
4335 * The changed_flags value reflects the list of bits that were
4336 * changed in the code above.
4337 */
4338
4339 /* Flush current ATR settings if ATR was disabled */
4340 if ((changed_flags & I40E_FLAG_FD_ATR_ENABLED) &&
4341 !(pf->flags & I40E_FLAG_FD_ATR_ENABLED)) {
4342 pf->flags |= I40E_FLAG_FD_ATR_AUTO_DISABLED;
4343 set_bit(__I40E_FD_FLUSH_REQUESTED, pf->state);
4344 }
4345
4346 if (changed_flags & I40E_FLAG_TRUE_PROMISC_SUPPORT) {
4347 u16 sw_flags = 0, valid_flags = 0;
4348 int ret;
4349
4350 if (!(pf->flags & I40E_FLAG_TRUE_PROMISC_SUPPORT))
4351 sw_flags = I40E_AQ_SET_SWITCH_CFG_PROMISC;
4352 valid_flags = I40E_AQ_SET_SWITCH_CFG_PROMISC;
4353 ret = i40e_aq_set_switch_config(&pf->hw, sw_flags, valid_flags,
4354 0, NULL);
4355 if (ret && pf->hw.aq.asq_last_status != I40E_AQ_RC_ESRCH) {
4356 dev_info(&pf->pdev->dev,
4357 "couldn't set switch config bits, err %s aq_err %s\n",
4358 i40e_stat_str(&pf->hw, ret),
4359 i40e_aq_str(&pf->hw,
4360 pf->hw.aq.asq_last_status));
4361 /* not a fatal problem, just keep going */
4362 }
4363 }
4364
4365 /* Issue reset to cause things to take effect, as additional bits
4366 * are added we will need to create a mask of bits requiring reset
4367 */
4368 if (changed_flags & (I40E_FLAG_VEB_STATS_ENABLED |
4369 I40E_FLAG_LEGACY_RX |
4370 I40E_FLAG_SOURCE_PRUNING_DISABLED))
4371 i40e_do_reset(pf, BIT(__I40E_PF_RESET_REQUESTED), true);
4372
4373 return 0;
4374 }
4375
---
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