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Date:   Fri, 18 Dec 2020 15:12:54 +0800
From:   kernel test robot <lkp@...el.com>
To:     Saravana Kannan <saravanak@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        Saravana Kannan <saravanak@...gle.com>,
        kernel-team@...roid.com, linux-kernel@...r.kernel.org,
        Jisheng Zhang <Jisheng.Zhang@...aptics.com>,
        Kevin Hilman <khilman@...libre.com>,
        John Stultz <john.stultz@...aro.org>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Marc Zyngier <maz@...nel.org>
Subject: Re: [PATCH v1 4/5] driver core: Handle cycles in device links
 created by fw_devlink

Hi Saravana,

I love your patch! Perhaps something to improve:

[auto build test WARNING on driver-core/driver-core-testing]
[also build test WARNING on linus/master next-20201217]
[cannot apply to linux/master v5.10]
[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]

url:    https://github.com/0day-ci/linux/commits/Saravana-Kannan/Enable-fw_devlink-on-by-default/20201218-112111
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git accefff5b547a9a1d959c7e76ad539bf2480e78b
config: riscv-randconfig-r014-20201217 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project cee1e7d14f4628d6174b33640d502bff3b54ae45)
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 riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # https://github.com/0day-ci/linux/commit/7bdc87ea0400318d827410f454ec7e5fbaf470c3
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Saravana-Kannan/Enable-fw_devlink-on-by-default/20201218-112111
        git checkout 7bdc87ea0400318d827410f454ec7e5fbaf470c3
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv 

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

All warnings (new ones prefixed by >>):

                                                                           ~~~~~~~~~~ ^
   arch/riscv/include/asm/mmio.h:87:48: note: expanded from macro 'readb_cpu'
   #define readb_cpu(c)            ({ u8  __r = __raw_readb(c); __r; })
                                                            ^
   In file included from drivers/base/core.c:27:
   In file included from include/linux/netdevice.h:37:
   In file included from include/net/net_namespace.h:39:
   In file included from include/linux/skbuff.h:31:
   In file included from include/linux/dma-mapping.h:10:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/riscv/include/asm/io.h:149:
   include/asm-generic/io.h:564:9: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           return inw(addr);
                  ^~~~~~~~~
   arch/riscv/include/asm/io.h:56:76: note: expanded from macro 'inw'
   #define inw(c)          ({ u16 __v; __io_pbr(); __v = readw_cpu((void*)(PCI_IOBASE + (c))); __io_par(__v); __v; })
                                                                           ~~~~~~~~~~ ^
   arch/riscv/include/asm/mmio.h:88:76: note: expanded from macro 'readw_cpu'
   #define readw_cpu(c)            ({ u16 __r = le16_to_cpu((__force __le16)__raw_readw(c)); __r; })
                                                                                        ^
   include/uapi/linux/byteorder/little_endian.h:36:51: note: expanded from macro '__le16_to_cpu'
   #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
                                                     ^
   In file included from drivers/base/core.c:27:
   In file included from include/linux/netdevice.h:37:
   In file included from include/net/net_namespace.h:39:
   In file included from include/linux/skbuff.h:31:
   In file included from include/linux/dma-mapping.h:10:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/riscv/include/asm/io.h:149:
   include/asm-generic/io.h:572:9: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           return inl(addr);
                  ^~~~~~~~~
   arch/riscv/include/asm/io.h:57:76: note: expanded from macro 'inl'
   #define inl(c)          ({ u32 __v; __io_pbr(); __v = readl_cpu((void*)(PCI_IOBASE + (c))); __io_par(__v); __v; })
                                                                           ~~~~~~~~~~ ^
   arch/riscv/include/asm/mmio.h:89:76: note: expanded from macro 'readl_cpu'
   #define readl_cpu(c)            ({ u32 __r = le32_to_cpu((__force __le32)__raw_readl(c)); __r; })
                                                                                        ^
   include/uapi/linux/byteorder/little_endian.h:34:51: note: expanded from macro '__le32_to_cpu'
   #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
                                                     ^
   In file included from drivers/base/core.c:27:
   In file included from include/linux/netdevice.h:37:
   In file included from include/net/net_namespace.h:39:
   In file included from include/linux/skbuff.h:31:
   In file included from include/linux/dma-mapping.h:10:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/riscv/include/asm/io.h:149:
   include/asm-generic/io.h:580:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           outb(value, addr);
           ^~~~~~~~~~~~~~~~~
   arch/riscv/include/asm/io.h:59:68: note: expanded from macro 'outb'
   #define outb(v,c)       ({ __io_pbw(); writeb_cpu((v),(void*)(PCI_IOBASE + (c))); __io_paw(); })
                                                                 ~~~~~~~~~~ ^
   arch/riscv/include/asm/mmio.h:91:52: note: expanded from macro 'writeb_cpu'
   #define writeb_cpu(v, c)        ((void)__raw_writeb((v), (c)))
                                                             ^
   In file included from drivers/base/core.c:27:
   In file included from include/linux/netdevice.h:37:
   In file included from include/net/net_namespace.h:39:
   In file included from include/linux/skbuff.h:31:
   In file included from include/linux/dma-mapping.h:10:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/riscv/include/asm/io.h:149:
   include/asm-generic/io.h:588:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           outw(value, addr);
           ^~~~~~~~~~~~~~~~~
   arch/riscv/include/asm/io.h:60:68: note: expanded from macro 'outw'
   #define outw(v,c)       ({ __io_pbw(); writew_cpu((v),(void*)(PCI_IOBASE + (c))); __io_paw(); })
                                                                 ~~~~~~~~~~ ^
   arch/riscv/include/asm/mmio.h:92:76: note: expanded from macro 'writew_cpu'
   #define writew_cpu(v, c)        ((void)__raw_writew((__force u16)cpu_to_le16(v), (c)))
                                                                                     ^
   In file included from drivers/base/core.c:27:
   In file included from include/linux/netdevice.h:37:
   In file included from include/net/net_namespace.h:39:
   In file included from include/linux/skbuff.h:31:
   In file included from include/linux/dma-mapping.h:10:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/riscv/include/asm/io.h:149:
   include/asm-generic/io.h:596:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           outl(value, addr);
           ^~~~~~~~~~~~~~~~~
   arch/riscv/include/asm/io.h:61:68: note: expanded from macro 'outl'
   #define outl(v,c)       ({ __io_pbw(); writel_cpu((v),(void*)(PCI_IOBASE + (c))); __io_paw(); })
                                                                 ~~~~~~~~~~ ^
   arch/riscv/include/asm/mmio.h:93:76: note: expanded from macro 'writel_cpu'
   #define writel_cpu(v, c)        ((void)__raw_writel((__force u32)cpu_to_le32(v), (c)))
                                                                                     ^
   In file included from drivers/base/core.c:27:
   In file included from include/linux/netdevice.h:37:
   In file included from include/net/net_namespace.h:39:
   In file included from include/linux/skbuff.h:31:
   In file included from include/linux/dma-mapping.h:10:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/riscv/include/asm/io.h:149:
   include/asm-generic/io.h:1005:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
                                                     ~~~~~~~~~~ ^
>> drivers/base/core.c:1522:5: warning: no previous prototype for function 'fw_devlink_relax_cycle' [-Wmissing-prototypes]
   int fw_devlink_relax_cycle(struct device *con, void *sup)
       ^
   drivers/base/core.c:1522:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int fw_devlink_relax_cycle(struct device *con, void *sup)
   ^
   static 
   8 warnings generated.


vim +/fw_devlink_relax_cycle +1522 drivers/base/core.c

  1507	
  1508	/**
  1509	 * fw_devlink_relax_cycle - Convert cyclic links to SYNC_STATE_ONLY links
  1510	 * @con: Device to check dependencies for.
  1511	 * @sup: Device to check against.
  1512	 *
  1513	 * Check if @sup depends on @con or any device dependent on it (its child or
  1514	 * its consumer etc).  When such a cyclic dependency is found, convert all
  1515	 * device links created solely by fw_devlink into SYNC_STATE_ONLY device links.
  1516	 * This is the equivalent of doing fw_devlink=permissive just between the
  1517	 * devices in the cycle. We need to do this because, at this point, fw_devlink
  1518	 * can't tell which of these dependencies is not a real dependency.
  1519	 *
  1520	 * Return 1 if a cycle is found. Otherwise, return 0.
  1521	 */
> 1522	int fw_devlink_relax_cycle(struct device *con, void *sup)
  1523	{
  1524		struct device_link *link;
  1525		int ret;
  1526	
  1527		if (con == sup)
  1528			return 1;
  1529	
  1530		ret = device_for_each_child(con, sup, fw_devlink_relax_cycle);
  1531		if (ret)
  1532			return ret;
  1533	
  1534		list_for_each_entry(link, &con->links.consumers, s_node) {
  1535			if ((link->flags & ~DL_FLAG_INFERRED) ==
  1536			    (DL_FLAG_SYNC_STATE_ONLY | DL_FLAG_MANAGED))
  1537				continue;
  1538	
  1539			if (!fw_devlink_relax_cycle(link->consumer, sup))
  1540				continue;
  1541	
  1542			ret = 1;
  1543	
  1544			if (!(link->flags & DL_FLAG_INFERRED))
  1545				continue;
  1546	
  1547			pm_runtime_drop_link(link);
  1548			link->flags = DL_FLAG_MANAGED | FW_DEVLINK_FLAGS_PERMISSIVE;
  1549			dev_dbg(link->consumer, "Relaxing link with %s\n",
  1550				dev_name(link->supplier));
  1551		}
  1552		return ret;
  1553	}
  1554	

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

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