Re: [PATCH net-next v16 04/13] ax88179_178a: Add HW support for AX179A-based chips
From: kernel test robot
Date: Sun Oct 04 2026 - 14:06:45 EST
Hi Birger,
kernel test robot noticed the following build warnings:
[auto build test WARNING on 071876fd50482a68603a9460d80dd6dd58827ee1]
url: https://github.com/intel-lab-lkp/linux/commits/Birger-Koblitz/phylink-Add-phylink_mac_interrupt/20261004-073905
base: 071876fd50482a68603a9460d80dd6dd58827ee1
patch link: https://lore.kernel.org/r/20261004-ax88179a-v16-4-2a9ae4e68f7b%40birger-koblitz.de
patch subject: [PATCH net-next v16 04/13] ax88179_178a: Add HW support for AX179A-based chips
config: arm-defconfig (https://download.01.org/0day-ci/archive/20261005/202610050104.tjRXtbIC-lkp@xxxxxxxxx/config)
compiler: clang version 24.0.0git (https://github.com/llvm/llvm-project 5f609f950d2e80addf5566623013db68394334db)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261005/202610050104.tjRXtbIC-lkp@xxxxxxxxx/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202610050104.tjRXtbIC-lkp@xxxxxxxxx/
All warnings (new ones prefixed by >>):
>> drivers/net/usb/ax88179a_devices.c:783:24: warning: shift count >= width of type [-Wshift-count-overflow]
783 | tx_desc |= FIELD_PREP(AX179A_TX_DESC_MSS, (u64)skb_shinfo(skb)->gso_size);
| ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/usb/ax88179_lib.h:251:29: note: expanded from macro 'AX179A_TX_DESC_MSS'
251 | #define AX179A_TX_DESC_MSS GENMASK(46, 32)
| ^
include/linux/bits.h:51:24: note: expanded from macro 'GENMASK'
51 | #define GENMASK(h, l) GENMASK_TYPE(unsigned long, h, l)
| ^
include/linux/bits.h:48:20: note: expanded from macro 'GENMASK_TYPE'
48 | (type_max(t) << (l) & \
| ^
note: (skipping 4 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
include/linux/compiler_types.h:702:22: note: expanded from macro 'compiletime_assert'
702 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler_types.h:690:23: note: expanded from macro '_compiletime_assert'
690 | __compiletime_assert(condition, msg, prefix, suffix)
| ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler_types.h:682:9: note: expanded from macro '__compiletime_assert'
682 | if (!(condition)) \
| ^~~~~~~~~
>> drivers/net/usb/ax88179a_devices.c:783:24: warning: shift count >= width of type [-Wshift-count-overflow]
783 | tx_desc |= FIELD_PREP(AX179A_TX_DESC_MSS, (u64)skb_shinfo(skb)->gso_size);
| ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/usb/ax88179_lib.h:251:29: note: expanded from macro 'AX179A_TX_DESC_MSS'
251 | #define AX179A_TX_DESC_MSS GENMASK(46, 32)
| ^
include/linux/bits.h:51:24: note: expanded from macro 'GENMASK'
51 | #define GENMASK(h, l) GENMASK_TYPE(unsigned long, h, l)
| ^
include/linux/bits.h:49:20: note: expanded from macro 'GENMASK_TYPE'
49 | type_max(t) >> (BITS_PER_TYPE(t) - 1 - (h)))))
| ^
note: (skipping 4 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
include/linux/compiler_types.h:702:22: note: expanded from macro 'compiletime_assert'
702 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler_types.h:690:23: note: expanded from macro '_compiletime_assert'
690 | __compiletime_assert(condition, msg, prefix, suffix)
| ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler_types.h:682:9: note: expanded from macro '__compiletime_assert'
682 | if (!(condition)) \
| ^~~~~~~~~
>> drivers/net/usb/ax88179a_devices.c:783:24: warning: shift count >= width of type [-Wshift-count-overflow]
783 | tx_desc |= FIELD_PREP(AX179A_TX_DESC_MSS, (u64)skb_shinfo(skb)->gso_size);
| ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/usb/ax88179_lib.h:251:29: note: expanded from macro 'AX179A_TX_DESC_MSS'
251 | #define AX179A_TX_DESC_MSS GENMASK(46, 32)
| ^
include/linux/bits.h:51:24: note: expanded from macro 'GENMASK'
51 | #define GENMASK(h, l) GENMASK_TYPE(unsigned long, h, l)
| ^
include/linux/bits.h:48:20: note: expanded from macro 'GENMASK_TYPE'
48 | (type_max(t) << (l) & \
| ^
note: (skipping 4 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
include/linux/compiler_types.h:702:22: note: expanded from macro 'compiletime_assert'
702 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler_types.h:690:23: note: expanded from macro '_compiletime_assert'
690 | __compiletime_assert(condition, msg, prefix, suffix)
| ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler_types.h:682:9: note: expanded from macro '__compiletime_assert'
682 | if (!(condition)) \
| ^~~~~~~~~
>> drivers/net/usb/ax88179a_devices.c:783:24: warning: shift count >= width of type [-Wshift-count-overflow]
783 | tx_desc |= FIELD_PREP(AX179A_TX_DESC_MSS, (u64)skb_shinfo(skb)->gso_size);
| ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/usb/ax88179_lib.h:251:29: note: expanded from macro 'AX179A_TX_DESC_MSS'
251 | #define AX179A_TX_DESC_MSS GENMASK(46, 32)
| ^
include/linux/bits.h:51:24: note: expanded from macro 'GENMASK'
51 | #define GENMASK(h, l) GENMASK_TYPE(unsigned long, h, l)
| ^
include/linux/bits.h:49:20: note: expanded from macro 'GENMASK_TYPE'
49 | type_max(t) >> (BITS_PER_TYPE(t) - 1 - (h)))))
| ^
note: (skipping 4 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
include/linux/compiler_types.h:702:22: note: expanded from macro 'compiletime_assert'
702 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler_types.h:690:23: note: expanded from macro '_compiletime_assert'
690 | __compiletime_assert(condition, msg, prefix, suffix)
| ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler_types.h:682:9: note: expanded from macro '__compiletime_assert'
682 | if (!(condition)) \
| ^~~~~~~~~
>> drivers/net/usb/ax88179a_devices.c:783:24: warning: shift count >= width of type [-Wshift-count-overflow]
783 | tx_desc |= FIELD_PREP(AX179A_TX_DESC_MSS, (u64)skb_shinfo(skb)->gso_size);
| ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/usb/ax88179_lib.h:251:29: note: expanded from macro 'AX179A_TX_DESC_MSS'
251 | #define AX179A_TX_DESC_MSS GENMASK(46, 32)
| ^
include/linux/bits.h:51:24: note: expanded from macro 'GENMASK'
51 | #define GENMASK(h, l) GENMASK_TYPE(unsigned long, h, l)
| ^
include/linux/bits.h:48:20: note: expanded from macro 'GENMASK_TYPE'
48 | (type_max(t) << (l) & \
| ^
note: (skipping 4 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
include/linux/compiler_types.h:702:22: note: expanded from macro 'compiletime_assert'
702 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler_types.h:690:23: note: expanded from macro '_compiletime_assert'
690 | __compiletime_assert(condition, msg, prefix, suffix)
| ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler_types.h:682:9: note: expanded from macro '__compiletime_assert'
682 | if (!(condition)) \
| ^~~~~~~~~
>> drivers/net/usb/ax88179a_devices.c:783:24: warning: shift count >= width of type [-Wshift-count-overflow]
783 | tx_desc |= FIELD_PREP(AX179A_TX_DESC_MSS, (u64)skb_shinfo(skb)->gso_size);
| ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/usb/ax88179_lib.h:251:29: note: expanded from macro 'AX179A_TX_DESC_MSS'
251 | #define AX179A_TX_DESC_MSS GENMASK(46, 32)
| ^
include/linux/bits.h:51:24: note: expanded from macro 'GENMASK'
51 | #define GENMASK(h, l) GENMASK_TYPE(unsigned long, h, l)
| ^
include/linux/bits.h:49:20: note: expanded from macro 'GENMASK_TYPE'
49 | type_max(t) >> (BITS_PER_TYPE(t) - 1 - (h)))))
| ^
note: (skipping 4 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
include/linux/compiler_types.h:702:22: note: expanded from macro 'compiletime_assert'
702 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler_types.h:690:23: note: expanded from macro '_compiletime_assert'
690 | __compiletime_assert(condition, msg, prefix, suffix)
| ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler_types.h:682:9: note: expanded from macro '__compiletime_assert'
682 | if (!(condition)) \
| ^~~~~~~~~
6 warnings generated.
vim +783 drivers/net/usb/ax88179a_devices.c
770
771 static struct sk_buff *ax88179a_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
772 {
773 u64 tx_desc = skb->len & AX179A_TX_DESC_LEN_MASK;
774 int frame_size = dev->maxpacket;
775 struct sk_buff *ax_skb;
776 u64 *tx_desc_ptr;
777 int padding_size;
778 int headroom;
779 int tailroom;
780 u16 tci = 0;
781
782 /* TSO MSS */
> 783 tx_desc |= FIELD_PREP(AX179A_TX_DESC_MSS, (u64)skb_shinfo(skb)->gso_size);
784
785 headroom = (skb->len + sizeof(tx_desc)) % 8;
786 padding_size = headroom ? 8 - headroom : 0;
787
788 if (((skb->len + sizeof(tx_desc) + padding_size) % frame_size) == 0) {
789 padding_size += 8;
790 tx_desc |= AX179A_TX_DESC_DROP_PADD;
791 }
792
793 if ((dev->net->features & NETIF_F_HW_VLAN_CTAG_TX) && (vlan_get_tag(skb, &tci) >= 0)) {
794 tx_desc |= AX179A_TX_DESC_VLAN;
795 tx_desc |= FIELD_PREP(AX179A_TX_DESC_VLAN_ID, (u64)tci);
796 }
797
798 if (!dev->can_dma_sg && (dev->net->features & NETIF_F_SG) && skb_linearize(skb)) {
799 dev_kfree_skb_any(skb);
800 return NULL;
801 }
802
803 headroom = skb_headroom(skb);
804 tailroom = skb_tailroom(skb);
805
806 if (!(headroom >= sizeof(tx_desc) && tailroom >= padding_size)) {
807 ax_skb = skb_copy_expand(skb, sizeof(tx_desc), padding_size, flags);
808 dev_kfree_skb_any(skb);
809 skb = ax_skb;
810 if (!skb)
811 return NULL;
812 }
813 if (padding_size != 0)
814 skb_put_zero(skb, padding_size);
815 /* Copy TX header */
816 tx_desc_ptr = skb_push(skb, sizeof(tx_desc));
817 put_unaligned_le64(tx_desc, tx_desc_ptr);
818
819 usbnet_set_skb_tx_stats(skb, 1, 0);
820
821 return skb;
822 }
823
--
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