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

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Date:   Sun, 30 Jan 2022 05:57:10 +0800
From:   kernel test robot <lkp@...el.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
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:   cb323ee75d24e7acc2f188d123ba6df46159cf09
commit: 249dbe74d3c4b568a623fb55c56cddf19fdf0b89 ARM: 9108/1: oabi-compat: rework epoll_wait/epoll_pwait emulation
date:   5 months ago
config: riscv-randconfig-s031-20220129 (https://download.01.org/0day-ci/archive/20220130/202201300547.RZdxWp6u-lkp@intel.com/config)
compiler: riscv32-linux-gcc (GCC) 11.2.0
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-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=249dbe74d3c4b568a623fb55c56cddf19fdf0b89
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 249dbe74d3c4b568a623fb55c56cddf19fdf0b89
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=riscv SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
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

vim +81 include/linux/eventpoll.h

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

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