net/mac80211/he.c:158:33: warning: taking address of packed member 'rx_mcs_80' of class or structure 'ieee80211_he_mcs_nss_supp' may result in an unaligned pointer value

From: kernel test robot
Date: Sat Aug 28 2021 - 10:57:44 EST

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Hi Wen,

FYI, the error/warning still remains.

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 64b4fc45bea6f4faa843d2f97ff51665280efee1
commit: 7f7aa94bcaf03d0f18a6853d8f7dad6a4d25bbd6 mac80211: reduce peer HE MCS/NSS to own capabilities
date: 7 months ago
config: i386-randconfig-a015-20210828 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 4e1a164d7bd53653f79decc121afe784d2fde0a7)
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
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7f7aa94bcaf03d0f18a6853d8f7dad6a4d25bbd6
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 7f7aa94bcaf03d0f18a6853d8f7dad6a4d25bbd6
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=i386

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

All warnings (new ones prefixed by >>):

clang-14: warning: optimization flag '-falign-jumps=0' is not supported [-Wignored-optimization-argument]
In file included from net/mac80211/he.c:9:
In file included from net/mac80211/ieee80211_i.h:15:
In file included from include/linux/device.h:15:
In file included from include/linux/dev_printk.h:16:
In file included from include/linux/ratelimit.h:6:
In file included from include/linux/sched.h:14:
In file included from include/linux/pid.h:5:
In file included from include/linux/rculist.h:11:
In file included from include/linux/rcupdate.h:27:
In file included from include/linux/preempt.h:78:
In file included from arch/x86/include/asm/preempt.h:7:
In file included from include/linux/thread_info.h:56:
arch/x86/include/asm/thread_info.h:172:13: warning: calling '__builtin_frame_address' with a nonzero argument is unsafe [-Wframe-address]
oldframe = __builtin_frame_address(1);
^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/x86/include/asm/thread_info.h:174:11: warning: calling '__builtin_frame_address' with a nonzero argument is unsafe [-Wframe-address]
frame = __builtin_frame_address(2);
^~~~~~~~~~~~~~~~~~~~~~~~~~
>> net/mac80211/he.c:158:33: warning: taking address of packed member 'rx_mcs_80' of class or structure 'ieee80211_he_mcs_nss_supp' may result in an unaligned pointer value [-Waddress-of-packed-member]
ieee80211_he_mcs_intersection(&own_he_cap.he_mcs_nss_supp.rx_mcs_80,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
net/mac80211/he.c:159:12: warning: taking address of packed member 'rx_mcs_80' of class or structure 'ieee80211_he_mcs_nss_supp' may result in an unaligned pointer value [-Waddress-of-packed-member]
&he_cap->he_mcs_nss_supp.rx_mcs_80,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> net/mac80211/he.c:160:12: warning: taking address of packed member 'tx_mcs_80' of class or structure 'ieee80211_he_mcs_nss_supp' may result in an unaligned pointer value [-Waddress-of-packed-member]
&own_he_cap.he_mcs_nss_supp.tx_mcs_80,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
net/mac80211/he.c:161:12: warning: taking address of packed member 'tx_mcs_80' of class or structure 'ieee80211_he_mcs_nss_supp' may result in an unaligned pointer value [-Waddress-of-packed-member]
&he_cap->he_mcs_nss_supp.tx_mcs_80);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> net/mac80211/he.c:169:34: warning: taking address of packed member 'rx_mcs_160' of class or structure 'ieee80211_he_mcs_nss_supp' may result in an unaligned pointer value [-Waddress-of-packed-member]
ieee80211_he_mcs_intersection(&own_he_cap.he_mcs_nss_supp.rx_mcs_160,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
net/mac80211/he.c:170:13: warning: taking address of packed member 'rx_mcs_160' of class or structure 'ieee80211_he_mcs_nss_supp' may result in an unaligned pointer value [-Waddress-of-packed-member]
&he_cap->he_mcs_nss_supp.rx_mcs_160,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> net/mac80211/he.c:171:13: warning: taking address of packed member 'tx_mcs_160' of class or structure 'ieee80211_he_mcs_nss_supp' may result in an unaligned pointer value [-Waddress-of-packed-member]
&own_he_cap.he_mcs_nss_supp.tx_mcs_160,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
net/mac80211/he.c:172:13: warning: taking address of packed member 'tx_mcs_160' of class or structure 'ieee80211_he_mcs_nss_supp' may result in an unaligned pointer value [-Waddress-of-packed-member]
&he_cap->he_mcs_nss_supp.tx_mcs_160);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
net/mac80211/he.c:174:29: warning: taking address of packed member 'rx_mcs_160' of class or structure 'ieee80211_he_mcs_nss_supp' may result in an unaligned pointer value [-Waddress-of-packed-member]
ieee80211_he_mcs_disable(&he_cap->he_mcs_nss_supp.rx_mcs_160);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
net/mac80211/he.c:175:29: warning: taking address of packed member 'tx_mcs_160' of class or structure 'ieee80211_he_mcs_nss_supp' may result in an unaligned pointer value [-Waddress-of-packed-member]
ieee80211_he_mcs_disable(&he_cap->he_mcs_nss_supp.tx_mcs_160);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> net/mac80211/he.c:186:34: warning: taking address of packed member 'rx_mcs_80p80' of class or structure 'ieee80211_he_mcs_nss_supp' may result in an unaligned pointer value [-Waddress-of-packed-member]
ieee80211_he_mcs_intersection(&own_he_cap.he_mcs_nss_supp.rx_mcs_80p80,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
net/mac80211/he.c:187:13: warning: taking address of packed member 'rx_mcs_80p80' of class or structure 'ieee80211_he_mcs_nss_supp' may result in an unaligned pointer value [-Waddress-of-packed-member]
&he_cap->he_mcs_nss_supp.rx_mcs_80p80,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> net/mac80211/he.c:188:13: warning: taking address of packed member 'tx_mcs_80p80' of class or structure 'ieee80211_he_mcs_nss_supp' may result in an unaligned pointer value [-Waddress-of-packed-member]
&own_he_cap.he_mcs_nss_supp.tx_mcs_80p80,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
net/mac80211/he.c:189:13: warning: taking address of packed member 'tx_mcs_80p80' of class or structure 'ieee80211_he_mcs_nss_supp' may result in an unaligned pointer value [-Waddress-of-packed-member]
&he_cap->he_mcs_nss_supp.tx_mcs_80p80);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
net/mac80211/he.c:191:29: warning: taking address of packed member 'rx_mcs_80p80' of class or structure 'ieee80211_he_mcs_nss_supp' may result in an unaligned pointer value [-Waddress-of-packed-member]
ieee80211_he_mcs_disable(&he_cap->he_mcs_nss_supp.rx_mcs_80p80);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
net/mac80211/he.c:192:29: warning: taking address of packed member 'tx_mcs_80p80' of class or structure 'ieee80211_he_mcs_nss_supp' may result in an unaligned pointer value [-Waddress-of-packed-member]
ieee80211_he_mcs_disable(&he_cap->he_mcs_nss_supp.tx_mcs_80p80);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
18 warnings generated.

vim +158 net/mac80211/he.c

105
106 void
107 ieee80211_he_cap_ie_to_sta_he_cap(struct ieee80211_sub_if_data *sdata,
108 struct ieee80211_supported_band *sband,
109 const u8 *he_cap_ie, u8 he_cap_len,
110 const struct ieee80211_he_6ghz_capa *he_6ghz_capa,
111 struct sta_info *sta)
112 {
113 struct ieee80211_sta_he_cap *he_cap = &sta->sta.he_cap;
114 struct ieee80211_sta_he_cap own_he_cap = sband->iftype_data->he_cap;
115 struct ieee80211_he_cap_elem *he_cap_ie_elem = (void *)he_cap_ie;
116 u8 he_ppe_size;
117 u8 mcs_nss_size;
118 u8 he_total_size;
119 bool own_160, peer_160, own_80p80, peer_80p80;
120
121 memset(he_cap, 0, sizeof(*he_cap));
122
123 if (!he_cap_ie || !ieee80211_get_he_sta_cap(sband))
124 return;
125
126 /* Make sure size is OK */
127 mcs_nss_size = ieee80211_he_mcs_nss_size(he_cap_ie_elem);
128 he_ppe_size =
129 ieee80211_he_ppe_size(he_cap_ie[sizeof(he_cap->he_cap_elem) +
130 mcs_nss_size],
131 he_cap_ie_elem->phy_cap_info);
132 he_total_size = sizeof(he_cap->he_cap_elem) + mcs_nss_size +
133 he_ppe_size;
134 if (he_cap_len < he_total_size)
135 return;
136
137 memcpy(&he_cap->he_cap_elem, he_cap_ie, sizeof(he_cap->he_cap_elem));
138
139 /* HE Tx/Rx HE MCS NSS Support Field */
140 memcpy(&he_cap->he_mcs_nss_supp,
141 &he_cap_ie[sizeof(he_cap->he_cap_elem)], mcs_nss_size);
142
143 /* Check if there are (optional) PPE Thresholds */
144 if (he_cap->he_cap_elem.phy_cap_info[6] &
145 IEEE80211_HE_PHY_CAP6_PPE_THRESHOLD_PRESENT)
146 memcpy(he_cap->ppe_thres,
147 &he_cap_ie[sizeof(he_cap->he_cap_elem) + mcs_nss_size],
148 he_ppe_size);
149
150 he_cap->has_he = true;
151
152 sta->cur_max_bandwidth = ieee80211_sta_cap_rx_bw(sta);
153 sta->sta.bandwidth = ieee80211_sta_cur_vht_bw(sta);
154
155 if (sband->band == NL80211_BAND_6GHZ && he_6ghz_capa)
156 ieee80211_update_from_he_6ghz_capa(he_6ghz_capa, sta);
157
> 158 ieee80211_he_mcs_intersection(&own_he_cap.he_mcs_nss_supp.rx_mcs_80,
159 &he_cap->he_mcs_nss_supp.rx_mcs_80,
> 160 &own_he_cap.he_mcs_nss_supp.tx_mcs_80,
161 &he_cap->he_mcs_nss_supp.tx_mcs_80);
162
163 own_160 = own_he_cap.he_cap_elem.phy_cap_info[0] &
164 IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_160MHZ_IN_5G;
165 peer_160 = he_cap->he_cap_elem.phy_cap_info[0] &
166 IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_160MHZ_IN_5G;
167
168 if (peer_160 && own_160) {
> 169 ieee80211_he_mcs_intersection(&own_he_cap.he_mcs_nss_supp.rx_mcs_160,
170 &he_cap->he_mcs_nss_supp.rx_mcs_160,
> 171 &own_he_cap.he_mcs_nss_supp.tx_mcs_160,
172 &he_cap->he_mcs_nss_supp.tx_mcs_160);
173 } else if (peer_160 && !own_160) {
174 ieee80211_he_mcs_disable(&he_cap->he_mcs_nss_supp.rx_mcs_160);
175 ieee80211_he_mcs_disable(&he_cap->he_mcs_nss_supp.tx_mcs_160);
176 he_cap->he_cap_elem.phy_cap_info[0] &=
177 ~IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_160MHZ_IN_5G;
178 }
179
180 own_80p80 = own_he_cap.he_cap_elem.phy_cap_info[0] &
181 IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_80PLUS80_MHZ_IN_5G;
182 peer_80p80 = he_cap->he_cap_elem.phy_cap_info[0] &
183 IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_80PLUS80_MHZ_IN_5G;
184
185 if (peer_80p80 && own_80p80) {
> 186 ieee80211_he_mcs_intersection(&own_he_cap.he_mcs_nss_supp.rx_mcs_80p80,
187 &he_cap->he_mcs_nss_supp.rx_mcs_80p80,
> 188 &own_he_cap.he_mcs_nss_supp.tx_mcs_80p80,
189 &he_cap->he_mcs_nss_supp.tx_mcs_80p80);
190 } else if (peer_80p80 && !own_80p80) {
191 ieee80211_he_mcs_disable(&he_cap->he_mcs_nss_supp.rx_mcs_80p80);
192 ieee80211_he_mcs_disable(&he_cap->he_mcs_nss_supp.tx_mcs_80p80);
193 he_cap->he_cap_elem.phy_cap_info[0] &=
194 ~IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_80PLUS80_MHZ_IN_5G;
195 }
196 }
197

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

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