linux-kernel - include/linux/eventpoll.h:81:13: sparse: sparse: restricted __poll

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Date:   Sun, 2 Oct 2022 08:57:47 +0800
From:   kernel test robot <lkp@...el.com>
To:     Aurelien Jarno <aurelien@...el32.net>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Palmer Dabbelt <palmer@...osinc.com>
Subject: include/linux/eventpoll.h:81:13: sparse: sparse: restricted __poll_t
 degrades to integer

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   b357fd1c2afc1a3e1b73dc4574bb7ac0e3bd4193
commit: 6df2a016c0c8a3d0933ef33dd192ea6606b115e3 riscv: fix build with binutils 2.38
date:   8 months ago
config: riscv-randconfig-s041-20221002
compiler: riscv32-linux-gcc (GCC) 12.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6df2a016c0c8a3d0933ef33dd192ea6606b115e3
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 6df2a016c0c8a3d0933ef33dd192ea6606b115e3
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=riscv SHELL=/bin/bash fs/ net/dccp/

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

sparse warnings: (new ones prefixed by >>)
   fs/eventpoll.c: note: in included file:
>> include/linux/eventpoll.h:81:13: sparse: sparse: restricted __poll_t degrades to integer
>> include/linux/eventpoll.h:81:13: sparse: sparse: restricted __poll_t degrades to integer
   include/linux/eventpoll.h:81:13: sparse: sparse: cast from restricted __poll_t
--
   net/dccp/proto.c:524:52: sparse: sparse: incorrect type in argument 2 (different base types) @@     expected restricted __be32 const [usertype] service @@     got int [addressable] val @@
   net/dccp/proto.c:524:52: sparse:     expected restricted __be32 const [usertype] service
   net/dccp/proto.c:524:52: sparse:     got int [addressable] val
>> net/dccp/proto.c:595:13: sparse: sparse: restricted __be32 degrades to integer
>> net/dccp/proto.c:595:13: sparse: sparse: restricted __be32 degrades to integer
   net/dccp/proto.c:595:13: sparse: sparse: cast from restricted __be32
   net/dccp/proto.c:707:57: sparse: sparse: incorrect type in argument 2 (different base types) @@     expected restricted __be32 [usertype] param @@     got int cmsg_type @@
   net/dccp/proto.c:707:57: sparse:     expected restricted __be32 [usertype] param
   net/dccp/proto.c:707:57: sparse:     got int cmsg_type

vim +81 include/linux/eventpoll.h

^1da177e4c3f41 Linus Torvalds 2005-04-16  70  
249dbe74d3c4b5 Arnd Bergmann  2021-08-11  71  #if defined(CONFIG_ARM) && defined(CONFIG_OABI_COMPAT)
249dbe74d3c4b5 Arnd Bergmann  2021-08-11  72  /* ARM OABI has an incompatible struct layout and needs a special handler */
249dbe74d3c4b5 Arnd Bergmann  2021-08-11  73  extern struct epoll_event __user *
249dbe74d3c4b5 Arnd Bergmann  2021-08-11  74  epoll_put_uevent(__poll_t revents, __u64 data,
249dbe74d3c4b5 Arnd Bergmann  2021-08-11  75  		 struct epoll_event __user *uevent);
249dbe74d3c4b5 Arnd Bergmann  2021-08-11  76  #else
249dbe74d3c4b5 Arnd Bergmann  2021-08-11  77  static inline struct epoll_event __user *
249dbe74d3c4b5 Arnd Bergmann  2021-08-11  78  epoll_put_uevent(__poll_t revents, __u64 data,
249dbe74d3c4b5 Arnd Bergmann  2021-08-11  79  		 struct epoll_event __user *uevent)
249dbe74d3c4b5 Arnd Bergmann  2021-08-11  80  {
249dbe74d3c4b5 Arnd Bergmann  2021-08-11 @81  	if (__put_user(revents, &uevent->events) ||
249dbe74d3c4b5 Arnd Bergmann  2021-08-11  82  	    __put_user(data, &uevent->data))
249dbe74d3c4b5 Arnd Bergmann  2021-08-11  83  		return NULL;
249dbe74d3c4b5 Arnd Bergmann  2021-08-11  84  
249dbe74d3c4b5 Arnd Bergmann  2021-08-11  85  	return uevent+1;
249dbe74d3c4b5 Arnd Bergmann  2021-08-11  86  }
249dbe74d3c4b5 Arnd Bergmann  2021-08-11  87  #endif
249dbe74d3c4b5 Arnd Bergmann  2021-08-11  88  

:::::: The code at line 81 was first introduced by commit
:::::: 249dbe74d3c4b568a623fb55c56cddf19fdf0b89 ARM: 9108/1: oabi-compat: rework epoll_wait/epoll_pwait emulation

:::::: TO: Arnd Bergmann <arnd@...db.de>
:::::: CC: Russell King (Oracle) <rmk+kernel@...linux.org.uk>

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp

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