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Message-ID: <202207280822.VHS6qieH-lkp@intel.com>
Date:   Thu, 28 Jul 2022 08:04:33 +0800
From:   kernel test robot <lkp@...el.com>
To:     guoren@...nel.org, palmer@...osinc.com, heiko@...ech.de,
        hch@...radead.org, arnd@...db.de, peterz@...radead.org,
        will@...nel.org, boqun.feng@...il.com, longman@...hat.com,
        mingo@...hat.com, philipp.tomsich@...ll.eu, cmuellner@...ux.com,
        linux-kernel@...r.kernel.org, David.Laight@...lab.com
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-riscv@...ts.infradead.org, linux-csky@...r.kernel.org,
        Guo Ren <guoren@...ux.alibaba.com>
Subject: Re: [PATCH V8 07/10] riscv: Add qspinlock support

Hi,

I love your patch! Perhaps something to improve:

[auto build test WARNING on arnd-asm-generic/master]
[also build test WARNING on linus/master v5.19-rc8 next-20220727]
[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/guoren-kernel-org/arch-Add-qspinlock-support-with-combo-style/20220724-202743
base:   https://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic.git master
config: riscv-randconfig-r026-20220727 (https://download.01.org/0day-ci/archive/20220728/202207280822.VHS6qieH-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 8dfaecc4c24494337933aff9d9166486ca0949f1)
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/intel-lab-lkp/linux/commit/980c0acb7f432777e3473ab9a5696044e03b3f3d
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review guoren-kernel-org/arch-Add-qspinlock-support-with-combo-style/20220724-202743
        git checkout 980c0acb7f432777e3473ab9a5696044e03b3f3d
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash drivers/net/wireguard/

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

All warnings (new ones prefixed by >>):

   In file included from drivers/net/wireguard/queueing.c:6:
   In file included from drivers/net/wireguard/queueing.h:9:
   In file included from drivers/net/wireguard/peer.h:9:
   In file included from drivers/net/wireguard/device.h:9:
   In file included from drivers/net/wireguard/noise.h:8:
   In file included from drivers/net/wireguard/messages.h:10:
   In file included from include/crypto/chacha20poly1305.h:10:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/riscv/include/asm/io.h:136:
   include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           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]
           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'
   #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
                                                     ^
   In file included from drivers/net/wireguard/queueing.c:6:
   In file included from drivers/net/wireguard/queueing.h:9:
   In file included from drivers/net/wireguard/peer.h:9:
   In file included from drivers/net/wireguard/device.h:9:
   In file included from drivers/net/wireguard/noise.h:8:
   In file included from drivers/net/wireguard/messages.h:10:
   In file included from include/crypto/chacha20poly1305.h:10:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/riscv/include/asm/io.h:136:
   include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           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'
   #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
                                                     ^
   In file included from drivers/net/wireguard/queueing.c:6:
   In file included from drivers/net/wireguard/queueing.h:9:
   In file included from drivers/net/wireguard/peer.h:9:
   In file included from drivers/net/wireguard/device.h:9:
   In file included from drivers/net/wireguard/noise.h:8:
   In file included from drivers/net/wireguard/messages.h:10:
   In file included from include/crypto/chacha20poly1305.h:10:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/riscv/include/asm/io.h:136:
   include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __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]
           __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]
           __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:1107:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
                                                     ~~~~~~~~~~ ^
>> drivers/net/wireguard/queueing.c:68:18: warning: cast to smaller integer type 'u32' (aka 'unsigned int') from 'typeof (_x_)' (aka 'struct sk_buff *') [-Wpointer-to-int-cast]
           WRITE_ONCE(NEXT(xchg_release(&queue->head, skb)), skb);
                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/atomic/atomic-instrumented.h:1901:2: note: expanded from macro 'xchg_release'
           arch_xchg_release(__ai_ptr, __VA_ARGS__); \
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/atomic/atomic-arch-fallback.h:24:2: note: expanded from macro 'arch_xchg_release'
           __atomic_op_release(arch_xchg, __VA_ARGS__)
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/atomic.h:68:2: note: expanded from macro '__atomic_op_release'
           op##_relaxed(args);                                             \
           ^~~~~~~~~~~~~~~~~~
   note: (skipping 7 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
   include/linux/compiler_types.h:352:22: note: expanded from macro 'compiletime_assert'
           _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
                               ^~~~~~~~~
   include/linux/compiler_types.h:340:23: note: expanded from macro '_compiletime_assert'
           __compiletime_assert(condition, msg, prefix, suffix)
                                ^~~~~~~~~
   include/linux/compiler_types.h:332:9: note: expanded from macro '__compiletime_assert'
                   if (!(condition))                                       \
                         ^~~~~~~~~
>> drivers/net/wireguard/queueing.c:68:18: warning: cast to 'typeof (*((__ai_ptr)))' (aka 'struct sk_buff *') from smaller integer type 'unsigned int' [-Wint-to-pointer-cast]
           WRITE_ONCE(NEXT(xchg_release(&queue->head, skb)), skb);
           ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/atomic/atomic-instrumented.h:1901:2: note: expanded from macro 'xchg_release'
           arch_xchg_release(__ai_ptr, __VA_ARGS__); \
           ^
   include/linux/atomic/atomic-arch-fallback.h:24:2: note: expanded from macro 'arch_xchg_release'
           __atomic_op_release(arch_xchg, __VA_ARGS__)
           ^
   include/linux/atomic.h:68:2: note: expanded from macro '__atomic_op_release'
           op##_relaxed(args);                                             \
           ^
   note: (skipping 7 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
   include/linux/compiler_types.h:352:22: note: expanded from macro 'compiletime_assert'
           _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
           ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/compiler_types.h:340:23: note: expanded from macro '_compiletime_assert'
           __compiletime_assert(condition, msg, prefix, suffix)
           ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/compiler_types.h:332:9: note: expanded from macro '__compiletime_assert'
                   if (!(condition))                                       \
                         ^~~~~~~~~
>> drivers/net/wireguard/queueing.c:68:18: warning: cast to smaller integer type 'u32' (aka 'unsigned int') from 'typeof (_x_)' (aka 'struct sk_buff *') [-Wpointer-to-int-cast]
           WRITE_ONCE(NEXT(xchg_release(&queue->head, skb)), skb);
                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/atomic/atomic-instrumented.h:1901:2: note: expanded from macro 'xchg_release'
           arch_xchg_release(__ai_ptr, __VA_ARGS__); \
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/atomic/atomic-arch-fallback.h:24:2: note: expanded from macro 'arch_xchg_release'
           __atomic_op_release(arch_xchg, __VA_ARGS__)
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/atomic.h:68:2: note: expanded from macro '__atomic_op_release'
           op##_relaxed(args);                                             \
           ^~~~~~~~~~~~~~~~~~
   note: (skipping 7 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
   include/linux/compiler_types.h:352:22: note: expanded from macro 'compiletime_assert'
           _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
                               ^~~~~~~~~
   include/linux/compiler_types.h:340:23: note: expanded from macro '_compiletime_assert'
           __compiletime_assert(condition, msg, prefix, suffix)
                                ^~~~~~~~~
   include/linux/compiler_types.h:332:9: note: expanded from macro '__compiletime_assert'
                   if (!(condition))                                       \
                         ^~~~~~~~~
>> drivers/net/wireguard/queueing.c:68:18: warning: cast to 'typeof (*((__ai_ptr)))' (aka 'struct sk_buff *') from smaller integer type 'unsigned int' [-Wint-to-pointer-cast]
           WRITE_ONCE(NEXT(xchg_release(&queue->head, skb)), skb);
           ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/atomic/atomic-instrumented.h:1901:2: note: expanded from macro 'xchg_release'
           arch_xchg_release(__ai_ptr, __VA_ARGS__); \
           ^
   include/linux/atomic/atomic-arch-fallback.h:24:2: note: expanded from macro 'arch_xchg_release'
           __atomic_op_release(arch_xchg, __VA_ARGS__)
           ^
   include/linux/atomic.h:68:2: note: expanded from macro '__atomic_op_release'
           op##_relaxed(args);                                             \
           ^
   note: (skipping 7 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
   include/linux/compiler_types.h:352:22: note: expanded from macro 'compiletime_assert'
           _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
           ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/compiler_types.h:340:23: note: expanded from macro '_compiletime_assert'
           __compiletime_assert(condition, msg, prefix, suffix)
           ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/compiler_types.h:332:9: note: expanded from macro '__compiletime_assert'
                   if (!(condition))                                       \
                         ^~~~~~~~~
>> drivers/net/wireguard/queueing.c:68:18: warning: cast to smaller integer type 'u32' (aka 'unsigned int') from 'typeof (_x_)' (aka 'struct sk_buff *') [-Wpointer-to-int-cast]
           WRITE_ONCE(NEXT(xchg_release(&queue->head, skb)), skb);
                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/atomic/atomic-instrumented.h:1901:2: note: expanded from macro 'xchg_release'
           arch_xchg_release(__ai_ptr, __VA_ARGS__); \
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/atomic/atomic-arch-fallback.h:24:2: note: expanded from macro 'arch_xchg_release'
           __atomic_op_release(arch_xchg, __VA_ARGS__)
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/atomic.h:68:2: note: expanded from macro '__atomic_op_release'
           op##_relaxed(args);                                             \
           ^~~~~~~~~~~~~~~~~~
   note: (skipping 7 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
   include/linux/compiler_types.h:352:22: note: expanded from macro 'compiletime_assert'
           _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
                               ^~~~~~~~~
   include/linux/compiler_types.h:340:23: note: expanded from macro '_compiletime_assert'
           __compiletime_assert(condition, msg, prefix, suffix)
                                ^~~~~~~~~
   include/linux/compiler_types.h:332:9: note: expanded from macro '__compiletime_assert'
                   if (!(condition))                                       \
                         ^~~~~~~~~
>> drivers/net/wireguard/queueing.c:68:18: warning: cast to 'typeof (*((__ai_ptr)))' (aka 'struct sk_buff *') from smaller integer type 'unsigned int' [-Wint-to-pointer-cast]
           WRITE_ONCE(NEXT(xchg_release(&queue->head, skb)), skb);
           ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/atomic/atomic-instrumented.h:1901:2: note: expanded from macro 'xchg_release'
           arch_xchg_release(__ai_ptr, __VA_ARGS__); \
           ^
   include/linux/atomic/atomic-arch-fallback.h:24:2: note: expanded from macro 'arch_xchg_release'
           __atomic_op_release(arch_xchg, __VA_ARGS__)
           ^
   include/linux/atomic.h:68:2: note: expanded from macro '__atomic_op_release'
           op##_relaxed(args);                                             \
           ^
   note: (skipping 7 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
   include/linux/compiler_types.h:352:22: note: expanded from macro 'compiletime_assert'
           _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
           ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/compiler_types.h:340:23: note: expanded from macro '_compiletime_assert'
           __compiletime_assert(condition, msg, prefix, suffix)
           ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/compiler_types.h:332:9: note: expanded from macro '__compiletime_assert'
                   if (!(condition))                                       \
                         ^~~~~~~~~
>> drivers/net/wireguard/queueing.c:68:18: warning: cast to smaller integer type 'u32' (aka 'unsigned int') from 'typeof (_x_)' (aka 'struct sk_buff *') [-Wpointer-to-int-cast]
           WRITE_ONCE(NEXT(xchg_release(&queue->head, skb)), skb);
                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/atomic/atomic-instrumented.h:1901:2: note: expanded from macro 'xchg_release'
           arch_xchg_release(__ai_ptr, __VA_ARGS__); \
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/atomic/atomic-arch-fallback.h:24:2: note: expanded from macro 'arch_xchg_release'
           __atomic_op_release(arch_xchg, __VA_ARGS__)
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/atomic.h:68:2: note: expanded from macro '__atomic_op_release'
           op##_relaxed(args);                                             \
           ^~~~~~~~~~~~~~~~~~
   note: (skipping 7 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
   include/linux/compiler_types.h:352:22: note: expanded from macro 'compiletime_assert'
           _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
                               ^~~~~~~~~
   include/linux/compiler_types.h:340:23: note: expanded from macro '_compiletime_assert'
           __compiletime_assert(condition, msg, prefix, suffix)
                                ^~~~~~~~~
   include/linux/compiler_types.h:332:9: note: expanded from macro '__compiletime_assert'
                   if (!(condition))                                       \
                         ^~~~~~~~~
>> drivers/net/wireguard/queueing.c:68:18: warning: cast to 'typeof (*((__ai_ptr)))' (aka 'struct sk_buff *') from smaller integer type 'unsigned int' [-Wint-to-pointer-cast]
           WRITE_ONCE(NEXT(xchg_release(&queue->head, skb)), skb);
           ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/atomic/atomic-instrumented.h:1901:2: note: expanded from macro 'xchg_release'
           arch_xchg_release(__ai_ptr, __VA_ARGS__); \
           ^
   include/linux/atomic/atomic-arch-fallback.h:24:2: note: expanded from macro 'arch_xchg_release'
           __atomic_op_release(arch_xchg, __VA_ARGS__)
           ^
   include/linux/atomic.h:68:2: note: expanded from macro '__atomic_op_release'
           op##_relaxed(args);                                             \
           ^
   note: (skipping 7 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
   include/linux/compiler_types.h:352:22: note: expanded from macro 'compiletime_assert'
           _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
           ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/compiler_types.h:340:23: note: expanded from macro '_compiletime_assert'
           __compiletime_assert(condition, msg, prefix, suffix)
           ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/compiler_types.h:332:9: note: expanded from macro '__compiletime_assert'
                   if (!(condition))                                       \
                         ^~~~~~~~~
>> drivers/net/wireguard/queueing.c:68:18: warning: cast to smaller integer type 'u32' (aka 'unsigned int') from 'typeof (_x_)' (aka 'struct sk_buff *') [-Wpointer-to-int-cast]
           WRITE_ONCE(NEXT(xchg_release(&queue->head, skb)), skb);
                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/atomic/atomic-instrumented.h:1901:2: note: expanded from macro 'xchg_release'
           arch_xchg_release(__ai_ptr, __VA_ARGS__); \
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/atomic/atomic-arch-fallback.h:24:2: note: expanded from macro 'arch_xchg_release'
           __atomic_op_release(arch_xchg, __VA_ARGS__)
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/atomic.h:68:2: note: expanded from macro '__atomic_op_release'
           op##_relaxed(args);                                             \
           ^~~~~~~~~~~~~~~~~~
   note: (skipping 6 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
   include/linux/compiler_types.h:352:22: note: expanded from macro 'compiletime_assert'
           _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
                               ^~~~~~~~~
   include/linux/compiler_types.h:340:23: note: expanded from macro '_compiletime_assert'
           __compiletime_assert(condition, msg, prefix, suffix)
                                ^~~~~~~~~
   include/linux/compiler_types.h:332:9: note: expanded from macro '__compiletime_assert'
                   if (!(condition))                                       \
                         ^~~~~~~~~
>> drivers/net/wireguard/queueing.c:68:18: warning: cast to 'typeof (*((__ai_ptr)))' (aka 'struct sk_buff *') from smaller integer type 'unsigned int' [-Wint-to-pointer-cast]
           WRITE_ONCE(NEXT(xchg_release(&queue->head, skb)), skb);
           ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/atomic/atomic-instrumented.h:1901:2: note: expanded from macro 'xchg_release'
           arch_xchg_release(__ai_ptr, __VA_ARGS__); \
           ^
   include/linux/atomic/atomic-arch-fallback.h:24:2: note: expanded from macro 'arch_xchg_release'
           __atomic_op_release(arch_xchg, __VA_ARGS__)
           ^
   include/linux/atomic.h:68:2: note: expanded from macro '__atomic_op_release'
           op##_relaxed(args);                                             \
           ^
   note: (skipping 6 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
   include/linux/compiler_types.h:352:22: note: expanded from macro 'compiletime_assert'
           _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
           ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/compiler_types.h:340:23: note: expanded from macro '_compiletime_assert'
           __compiletime_assert(condition, msg, prefix, suffix)
           ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/compiler_types.h:332:9: note: expanded from macro '__compiletime_assert'
                   if (!(condition))                                       \
                         ^~~~~~~~~
>> drivers/net/wireguard/queueing.c:68:18: warning: cast to smaller integer type 'u32' (aka 'unsigned int') from 'typeof (_x_)' (aka 'struct sk_buff *') [-Wpointer-to-int-cast]
           WRITE_ONCE(NEXT(xchg_release(&queue->head, skb)), skb);
                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/atomic/atomic-instrumented.h:1901:2: note: expanded from macro 'xchg_release'
           arch_xchg_release(__ai_ptr, __VA_ARGS__); \
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/atomic/atomic-arch-fallback.h:24:2: note: expanded from macro 'arch_xchg_release'
           __atomic_op_release(arch_xchg, __VA_ARGS__)
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/atomic.h:68:2: note: expanded from macro '__atomic_op_release'
           op##_relaxed(args);                                             \
           ^~~~~~~~~~~~~~~~~~
   note: (skipping 3 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
   drivers/net/wireguard/queueing.c:49:21: note: expanded from macro 'NEXT'
   #define NEXT(skb) ((skb)->prev)
                       ^~~
   include/asm-generic/rwonce.h:61:15: note: expanded from macro 'WRITE_ONCE'
           __WRITE_ONCE(x, val);                                           \
                        ^
   include/asm-generic/rwonce.h:55:20: note: expanded from macro '__WRITE_ONCE'
           *(volatile typeof(x) *)&(x) = (val);                            \
                             ^
>> drivers/net/wireguard/queueing.c:68:18: warning: cast to 'typeof (*((__ai_ptr)))' (aka 'struct sk_buff *') from smaller integer type 'unsigned int' [-Wint-to-pointer-cast]
           WRITE_ONCE(NEXT(xchg_release(&queue->head, skb)), skb);
           ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/atomic/atomic-instrumented.h:1901:2: note: expanded from macro 'xchg_release'
           arch_xchg_release(__ai_ptr, __VA_ARGS__); \
           ^
   include/linux/atomic/atomic-arch-fallback.h:24:2: note: expanded from macro 'arch_xchg_release'
           __atomic_op_release(arch_xchg, __VA_ARGS__)
           ^
   include/linux/atomic.h:68:2: note: expanded from macro '__atomic_op_release'
           op##_relaxed(args);                                             \
           ^
   note: (skipping 3 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
   drivers/net/wireguard/queueing.c:49:21: note: expanded from macro 'NEXT'
   #define NEXT(skb) ((skb)->prev)
                       ^
   include/asm-generic/rwonce.h:61:15: note: expanded from macro 'WRITE_ONCE'
           __WRITE_ONCE(x, val);                                           \
           ~~~~~~~~~~~~~^~~~~~~
   include/asm-generic/rwonce.h:55:20: note: expanded from macro '__WRITE_ONCE'
           *(volatile typeof(x) *)&(x) = (val);                            \
                             ^
>> drivers/net/wireguard/queueing.c:68:18: warning: cast to smaller integer type 'u32' (aka 'unsigned int') from 'typeof (_x_)' (aka 'struct sk_buff *') [-Wpointer-to-int-cast]
           WRITE_ONCE(NEXT(xchg_release(&queue->head, skb)), skb);
                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/atomic/atomic-instrumented.h:1901:2: note: expanded from macro 'xchg_release'
           arch_xchg_release(__ai_ptr, __VA_ARGS__); \
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/atomic/atomic-arch-fallback.h:24:2: note: expanded from macro 'arch_xchg_release'
           __atomic_op_release(arch_xchg, __VA_ARGS__)
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/atomic.h:68:2: note: expanded from macro '__atomic_op_release'
           op##_relaxed(args);                                             \
           ^~~~~~~~~~~~~~~~~~
   note: (skipping 3 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
   drivers/net/wireguard/queueing.c:49:21: note: expanded from macro 'NEXT'
   #define NEXT(skb) ((skb)->prev)
                       ^~~
   include/asm-generic/rwonce.h:61:15: note: expanded from macro 'WRITE_ONCE'
           __WRITE_ONCE(x, val);                                           \
                        ^
   include/asm-generic/rwonce.h:55:27: note: expanded from macro '__WRITE_ONCE'
           *(volatile typeof(x) *)&(x) = (val);                            \
                                    ^
>> drivers/net/wireguard/queueing.c:68:18: warning: cast to 'typeof (*((__ai_ptr)))' (aka 'struct sk_buff *') from smaller integer type 'unsigned int' [-Wint-to-pointer-cast]
           WRITE_ONCE(NEXT(xchg_release(&queue->head, skb)), skb);
           ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/atomic/atomic-instrumented.h:1901:2: note: expanded from macro 'xchg_release'
           arch_xchg_release(__ai_ptr, __VA_ARGS__); \
           ^
   include/linux/atomic/atomic-arch-fallback.h:24:2: note: expanded from macro 'arch_xchg_release'
           __atomic_op_release(arch_xchg, __VA_ARGS__)
           ^
   include/linux/atomic.h:68:2: note: expanded from macro '__atomic_op_release'
           op##_relaxed(args);                                             \
           ^
   note: (skipping 3 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
   drivers/net/wireguard/queueing.c:49:21: note: expanded from macro 'NEXT'
   #define NEXT(skb) ((skb)->prev)
                       ^
   include/asm-generic/rwonce.h:61:15: note: expanded from macro 'WRITE_ONCE'
           __WRITE_ONCE(x, val);                                           \
           ~~~~~~~~~~~~~^~~~~~~
   include/asm-generic/rwonce.h:55:27: note: expanded from macro '__WRITE_ONCE'
           *(volatile typeof(x) *)&(x) = (val);                            \
                                    ^
   21 warnings generated.


vim +68 drivers/net/wireguard/queueing.c

8b5553ace83cced7 Jason A. Donenfeld 2021-02-22  64  
8b5553ace83cced7 Jason A. Donenfeld 2021-02-22  65  static void __wg_prev_queue_enqueue(struct prev_queue *queue, struct sk_buff *skb)
8b5553ace83cced7 Jason A. Donenfeld 2021-02-22  66  {
8b5553ace83cced7 Jason A. Donenfeld 2021-02-22  67  	WRITE_ONCE(NEXT(skb), NULL);
8b5553ace83cced7 Jason A. Donenfeld 2021-02-22 @68  	WRITE_ONCE(NEXT(xchg_release(&queue->head, skb)), skb);
8b5553ace83cced7 Jason A. Donenfeld 2021-02-22  69  }
8b5553ace83cced7 Jason A. Donenfeld 2021-02-22  70  

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