From: kernel test robot <lkp@intel.com>
To: Colin Foster <colin.foster@in-advantage.com>,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org
Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev,
Steve Glendinning <steve.glendinning@shawell.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Colin Foster <colin.foster@in-advantage.com>
Subject: Re: [PATCH v1] smsc911x: add second read of EEPROM mac when possible corruption seen
Date: Tue, 11 Aug 2026 18:36:39 +0800 [thread overview]
Message-ID: <202608111832.kjA1WwgS-lkp@intel.com> (raw)
In-Reply-To: <20250828214452.11683-1-colin.foster@in-advantage.com>
Hi Colin,
kernel test robot noticed the following build warnings:
[auto build test WARNING on horms-ipvs/master]
[cannot apply to linus/master v7.2-rc7 next-20260807]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Colin-Foster/smsc911x-add-second-read-of-EEPROM-mac-when-possible-corruption-seen/20260810-123819
base: https://git.kernel.org/pub/scm/linux/kernel/git/horms/ipvs.git master
patch link: https://lore.kernel.org/r/20250828214452.11683-1-colin.foster%40in-advantage.com
patch subject: [PATCH v1] smsc911x: add second read of EEPROM mac when possible corruption seen
config: hexagon-randconfig-001-20260811 (https://download.01.org/0day-ci/archive/20260811/202608111832.kjA1WwgS-lkp@intel.com/config)
compiler: clang version 24.0.0git (https://github.com/llvm/llvm-project 12df34b8469b8095359de8c249cb1b2753fadeea)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260811/202608111832.kjA1WwgS-lkp@intel.com/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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202608111832.kjA1WwgS-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from drivers/net/ethernet/smsc/smsc911x.c:25:
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:10:
In file included from include/linux/highmem.h:12:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/hexagon/include/asm/io.h:334:
include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
547 | val = __raw_readb(PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
560 | val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
| ^
In file included from drivers/net/ethernet/smsc/smsc911x.c:25:
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:10:
In file included from include/linux/highmem.h:12:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/hexagon/include/asm/io.h:334:
include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
573 | val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
35 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
| ^
In file included from drivers/net/ethernet/smsc/smsc911x.c:25:
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:10:
In file included from include/linux/highmem.h:12:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/hexagon/include/asm/io.h:334:
include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
584 | __raw_writeb(value, PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
594 | __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
604 | __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
>> drivers/net/ethernet/smsc/smsc911x.c:2179:5: warning: mixing declarations and code is incompatible with standards before C99 [-Wdeclaration-after-statement]
2179 | u8 addr[ETH_ALEN];
| ^
7 warnings generated.
vim +2179 drivers/net/ethernet/smsc/smsc911x.c
631b7568c7d8f02 drivers/net/smsc911x.c Steve Glendinning 2008-12-25 2160
31f4574774e98aa drivers/net/smsc911x.c Steve Glendinning 2009-01-27 2161 /* copies the current mac address from hardware to dev->dev_addr */
8489ec1f9700649 drivers/net/ethernet/smsc/smsc911x.c Bill Pemberton 2012-12-03 2162 static void smsc911x_read_mac_address(struct net_device *dev)
31f4574774e98aa drivers/net/smsc911x.c Steve Glendinning 2009-01-27 2163 {
31f4574774e98aa drivers/net/smsc911x.c Steve Glendinning 2009-01-27 2164 struct smsc911x_data *pdata = netdev_priv(dev);
8b1e595e2e78004 drivers/net/ethernet/smsc/smsc911x.c Colin Foster 2025-08-28 2165 u32 mac_high16, mac_low32;
8b1e595e2e78004 drivers/net/ethernet/smsc/smsc911x.c Colin Foster 2025-08-28 2166
8b1e595e2e78004 drivers/net/ethernet/smsc/smsc911x.c Colin Foster 2025-08-28 2167 mac_high16 = smsc911x_mac_read(pdata, ADDRH);
8b1e595e2e78004 drivers/net/ethernet/smsc/smsc911x.c Colin Foster 2025-08-28 2168 mac_low32 = smsc911x_mac_read(pdata, ADDRL);
8b1e595e2e78004 drivers/net/ethernet/smsc/smsc911x.c Colin Foster 2025-08-28 2169
8b1e595e2e78004 drivers/net/ethernet/smsc/smsc911x.c Colin Foster 2025-08-28 2170 /*
8b1e595e2e78004 drivers/net/ethernet/smsc/smsc911x.c Colin Foster 2025-08-28 2171 * The first mac_read always returns 0. Re-read it to get the
8b1e595e2e78004 drivers/net/ethernet/smsc/smsc911x.c Colin Foster 2025-08-28 2172 * full MAC
8b1e595e2e78004 drivers/net/ethernet/smsc/smsc911x.c Colin Foster 2025-08-28 2173 */
8b1e595e2e78004 drivers/net/ethernet/smsc/smsc911x.c Colin Foster 2025-08-28 2174 if (mac_high16 == 0) {
8b1e595e2e78004 drivers/net/ethernet/smsc/smsc911x.c Colin Foster 2025-08-28 2175 SMSC_TRACE(pdata, probe, "Re-read MAC ADDRH\n");
8b1e595e2e78004 drivers/net/ethernet/smsc/smsc911x.c Colin Foster 2025-08-28 2176 mac_high16 = smsc911x_mac_read(pdata, ADDRH);
8b1e595e2e78004 drivers/net/ethernet/smsc/smsc911x.c Colin Foster 2025-08-28 2177 }
8b1e595e2e78004 drivers/net/ethernet/smsc/smsc911x.c Colin Foster 2025-08-28 2178
f15fef4c0675d41 drivers/net/ethernet/smsc/smsc911x.c Jakub Kicinski 2021-10-18 @2179 u8 addr[ETH_ALEN];
f15fef4c0675d41 drivers/net/ethernet/smsc/smsc911x.c Jakub Kicinski 2021-10-18 2180
f15fef4c0675d41 drivers/net/ethernet/smsc/smsc911x.c Jakub Kicinski 2021-10-18 2181 addr[0] = (u8)(mac_low32);
f15fef4c0675d41 drivers/net/ethernet/smsc/smsc911x.c Jakub Kicinski 2021-10-18 2182 addr[1] = (u8)(mac_low32 >> 8);
f15fef4c0675d41 drivers/net/ethernet/smsc/smsc911x.c Jakub Kicinski 2021-10-18 2183 addr[2] = (u8)(mac_low32 >> 16);
f15fef4c0675d41 drivers/net/ethernet/smsc/smsc911x.c Jakub Kicinski 2021-10-18 2184 addr[3] = (u8)(mac_low32 >> 24);
f15fef4c0675d41 drivers/net/ethernet/smsc/smsc911x.c Jakub Kicinski 2021-10-18 2185 addr[4] = (u8)(mac_high16);
f15fef4c0675d41 drivers/net/ethernet/smsc/smsc911x.c Jakub Kicinski 2021-10-18 2186 addr[5] = (u8)(mac_high16 >> 8);
f15fef4c0675d41 drivers/net/ethernet/smsc/smsc911x.c Jakub Kicinski 2021-10-18 2187 eth_hw_addr_set(dev, addr);
31f4574774e98aa drivers/net/smsc911x.c Steve Glendinning 2009-01-27 2188 }
31f4574774e98aa drivers/net/smsc911x.c Steve Glendinning 2009-01-27 2189
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
prev parent reply other threads:[~2026-08-11 10:37 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-28 21:44 Colin Foster
2025-09-01 20:57 ` Jakub Kicinski
2025-09-02 12:31 ` Colin Foster
2025-09-02 19:05 ` Jakub Kicinski
2026-08-10 8:20 ` kernel test robot
2026-08-11 10:36 ` kernel test robot [this message]
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