drivers/staging/vt6656/rxtx.c:385:34: warning: taking address of packed member 'tx' of class or structure 'vnt_tx_head::(anonymous)' may result in an unaligned pointer value

From: kernel test robot
Date: Mon Mar 01 2021 - 16:03:36 EST

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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: fe07bfda2fb9cdef8a4d4008a409bb02f35f1bd8
commit: 2faf12c57efe1f905007e866d753af7851205aec staging: vt665x: fix alignment constraints
date: 3 weeks ago
config: mips-randconfig-r011-20210301 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project b077d82b00d81934c7c27ac89dd8b0e7f448bded)
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 mips cross compiling tool for clang build
# apt-get install binutils-mips-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2faf12c57efe1f905007e866d753af7851205aec
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 2faf12c57efe1f905007e866d753af7851205aec
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips

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

All warnings (new ones prefixed by >>):

In file included from drivers/staging/vt6656/rxtx.c:23:
In file included from include/linux/etherdevice.h:20:
In file included from include/linux/if_ether.h:19:
In file included from include/linux/skbuff.h:17:
In file included from include/linux/bvec.h:14:
In file included from include/linux/mm.h:33:
In file included from include/linux/pgtable.h:6:
arch/mips/include/asm/pgtable.h:202:3: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
arch/mips/include/asm/cmpxchg.h:220:2: note: expanded from macro 'cmpxchg64'
cmpxchg((ptr), (o), (n)); \
^
arch/mips/include/asm/cmpxchg.h:204:7: note: expanded from macro 'cmpxchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from drivers/staging/vt6656/rxtx.c:23:
In file included from include/linux/etherdevice.h:20:
In file included from include/linux/if_ether.h:19:
In file included from include/linux/skbuff.h:28:
In file included from include/net/checksum.h:22:
arch/mips/include/asm/checksum.h:161:9: error: unsupported inline asm: input with type 'unsigned long' matching output with type '__wsum' (aka 'unsigned int')
: "0" ((__force unsigned long)daddr),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from drivers/staging/vt6656/rxtx.c:23:
In file included from include/linux/etherdevice.h:21:
include/linux/netdevice.h:560:11: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
} while (cmpxchg(&n->state, val, new) != val);
^
arch/mips/include/asm/cmpxchg.h:194:7: note: expanded from macro 'cmpxchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from drivers/staging/vt6656/rxtx.c:23:
In file included from include/linux/etherdevice.h:21:
include/linux/netdevice.h:560:11: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
arch/mips/include/asm/cmpxchg.h:204:7: note: expanded from macro 'cmpxchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from drivers/staging/vt6656/rxtx.c:24:
In file included from drivers/staging/vt6656/device.h:32:
In file included from include/net/mac80211.h:22:
In file included from include/net/codel.h:48:
In file included from include/net/inet_ecn.h:9:
In file included from include/net/inet_sock.h:22:
In file included from include/net/sock.h:61:
include/linux/poll.h:142:27: warning: division by zero is undefined [-Wdivision-by-zero]
M(RDNORM) | M(RDBAND) | M(WRNORM) | M(WRBAND) |
^~~~~~~~~
include/linux/poll.h:140:32: note: expanded from macro 'M'
#define M(X) (__force __poll_t)__MAP(val, POLL##X, (__force __u16)EPOLL##X)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/poll.h:126:51: note: expanded from macro '__MAP'
(from < to ? (v & from) * (to/from) : (v & from) / (from/to))
^ ~~~~~~~~~
include/linux/poll.h:142:39: warning: division by zero is undefined [-Wdivision-by-zero]
M(RDNORM) | M(RDBAND) | M(WRNORM) | M(WRBAND) |
^~~~~~~~~
include/linux/poll.h:140:32: note: expanded from macro 'M'
#define M(X) (__force __poll_t)__MAP(val, POLL##X, (__force __u16)EPOLL##X)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/poll.h:126:51: note: expanded from macro '__MAP'
(from < to ? (v & from) * (to/from) : (v & from) / (from/to))
^ ~~~~~~~~~
In file included from drivers/staging/vt6656/rxtx.c:24:
In file included from drivers/staging/vt6656/device.h:32:
In file included from include/net/mac80211.h:22:
In file included from include/net/codel.h:48:
In file included from include/net/inet_ecn.h:9:
In file included from include/net/inet_sock.h:22:
include/net/sock.h:1994:12: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
old_dst = xchg((__force struct dst_entry **)&sk->sk_dst_cache, dst);
^
arch/mips/include/asm/cmpxchg.h:102:7: note: expanded from macro 'xchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from drivers/staging/vt6656/rxtx.c:24:
In file included from drivers/staging/vt6656/device.h:32:
In file included from include/net/mac80211.h:22:
In file included from include/net/codel.h:48:
In file included from include/net/inet_ecn.h:9:
In file included from include/net/inet_sock.h:22:
include/net/sock.h:2244:8: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
err = xchg(&sk->sk_err, 0);
^
arch/mips/include/asm/cmpxchg.h:102:7: note: expanded from macro 'xchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
>> drivers/staging/vt6656/rxtx.c:385:34: warning: taking address of packed member 'tx' of class or structure 'vnt_tx_head::(anonymous)' may result in an unaligned pointer value [-Waddress-of-packed-member]
union vnt_tx_data_head *head = &tx_head->tx_rts.tx.head;
^~~~~~~~~~~~~~~~~~~~~~~
>> drivers/staging/vt6656/rxtx.c:396:12: warning: taking address of packed member 'head' of class or structure 'vnt_tx_mic_hdr' may result in an unaligned pointer value [-Waddress-of-packed-member]
head = &tx_head->tx_rts.tx.mic.head;
^~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/staging/vt6656/rxtx.c:408:34: warning: taking address of packed member 'tx' of class or structure 'vnt_tx_head::(anonymous)' may result in an unaligned pointer value [-Waddress-of-packed-member]
union vnt_tx_data_head *head = &tx_head->tx_cts.tx.head;
^~~~~~~~~~~~~~~~~~~~~~~
drivers/staging/vt6656/rxtx.c:417:12: warning: taking address of packed member 'head' of class or structure 'vnt_tx_mic_hdr' may result in an unaligned pointer value [-Waddress-of-packed-member]
head = &tx_head->tx_cts.tx.mic.head;
^~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/staging/vt6656/rxtx.c:429:34: warning: taking address of packed member 'tx' of class or structure 'vnt_tx_head::(anonymous)' may result in an unaligned pointer value [-Waddress-of-packed-member]
union vnt_tx_data_head *head = &tx_head->tx_ab.tx.head;
^~~~~~~~~~~~~~~~~~~~~~
drivers/staging/vt6656/rxtx.c:435:12: warning: taking address of packed member 'head' of class or structure 'vnt_tx_mic_hdr' may result in an unaligned pointer value [-Waddress-of-packed-member]
head = &tx_head->tx_ab.tx.mic.head;
^~~~~~~~~~~~~~~~~~~~~~~~~~
24 warnings and 1 error generated.

vim +385 drivers/staging/vt6656/rxtx.c

dc6490b0c5058c Malcolm Priestley 2020-05-21 378
dc6490b0c5058c Malcolm Priestley 2020-05-21 379 static void vnt_rxtx_rts(struct vnt_usb_send_context *tx_context)
dc6490b0c5058c Malcolm Priestley 2020-05-21 380 {
dc6490b0c5058c Malcolm Priestley 2020-05-21 381 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx_context->skb);
dc6490b0c5058c Malcolm Priestley 2020-05-21 382 struct vnt_tx_buffer *tx_buffer = tx_context->tx_buffer;
dc6490b0c5058c Malcolm Priestley 2020-05-21 383 union vnt_tx_head *tx_head = &tx_buffer->tx_head;
dc6490b0c5058c Malcolm Priestley 2020-05-21 384 struct vnt_rrv_time_rts *buf = &tx_head->tx_rts.rts;
dc6490b0c5058c Malcolm Priestley 2020-05-21 @385 union vnt_tx_data_head *head = &tx_head->tx_rts.tx.head;
dc6490b0c5058c Malcolm Priestley 2020-05-21 386
dc6490b0c5058c Malcolm Priestley 2020-05-21 387 buf->rts_rrv_time_aa = vnt_get_rts_duration(tx_context);
dc6490b0c5058c Malcolm Priestley 2020-05-21 388 buf->rts_rrv_time_ba = buf->rts_rrv_time_aa;
dc6490b0c5058c Malcolm Priestley 2020-05-21 389 buf->rts_rrv_time_bb = buf->rts_rrv_time_aa;
dc6490b0c5058c Malcolm Priestley 2020-05-21 390
dc6490b0c5058c Malcolm Priestley 2020-05-21 391 buf->rrv_time_a = vnt_rxtx_rsvtime_le16(tx_context);
dc6490b0c5058c Malcolm Priestley 2020-05-21 392 buf->rrv_time_b = buf->rrv_time_a;
dc6490b0c5058c Malcolm Priestley 2020-05-21 393
dc6490b0c5058c Malcolm Priestley 2020-05-21 394 if (info->control.hw_key) {
dc6490b0c5058c Malcolm Priestley 2020-05-21 395 if (vnt_fill_txkey(tx_buffer, tx_context->skb))
dc6490b0c5058c Malcolm Priestley 2020-05-21 @396 head = &tx_head->tx_rts.tx.mic.head;
dc6490b0c5058c Malcolm Priestley 2020-05-21 397 }
dc6490b0c5058c Malcolm Priestley 2020-05-21 398
dc6490b0c5058c Malcolm Priestley 2020-05-21 399 vnt_rxtx_rts_g_head(tx_context, &head->rts_g);
dc6490b0c5058c Malcolm Priestley 2020-05-21 400 }
dc6490b0c5058c Malcolm Priestley 2020-05-21 401

:::::: The code at line 385 was first introduced by commit
:::::: dc6490b0c5058c44868b3921cfd3b2a223ee038c staging: vt6656: Move calling point of vnt_fill_txkey.

:::::: TO: Malcolm Priestley <tvboxspy@xxxxxxxxx>
:::::: CC: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

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

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Next message: Greg Kroah-Hartman: "[PATCH 4.19 168/247] net/mlx4_core: Add missed mlx4_free_cmd_mailbox()"
Previous message: Codrin Ciubotariu: "[PATCH v2 7/7] ASoC: convert Microchip I2SMCC binding to yaml"
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