Date:   Sat, 4 Feb 2023 06:10:58 +0800
From:   kernel test robot <lkp@intel.com>
To:     Nhat Pham <nphamcs@gmail.com>, akpm@linux-foundation.org
Cc:     oe-kbuild-all@lists.linux.dev, hannes@cmpxchg.org,
        linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        bfoster@redhat.com, willy@infradead.org, linux-api@vger.kernel.org,
        kernel-team@meta.com
Subject: Re: [PATCH v9 2/3] cachestat: implement cachestat syscall
Message-ID: <202302040606.Q2Z9z4KL-lkp@intel.com>
References: <20230203190413.2559707-3-nphamcs@gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20230203190413.2559707-3-nphamcs@gmail.com>
Precedence: bulk

Hi Nhat,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on 1440f576022887004f719883acb094e7e0dd4944]

url:    https://github.com/intel-lab-lkp/linux/commits/Nhat-Pham/workingset-refactor-LRU-refault-to-expose-refault-recency-check/20230204-030455
base:   1440f576022887004f719883acb094e7e0dd4944
patch link:    https://lore.kernel.org/r/20230203190413.2559707-3-nphamcs%40gmail.com
patch subject: [PATCH v9 2/3] cachestat: implement cachestat syscall
config: arm-allnoconfig (https://download.01.org/0day-ci/archive/20230204/202302040606.Q2Z9z4KL-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0
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
        # https://github.com/intel-lab-lkp/linux/commit/49a57ed71ac2c005231660c85c3f30c4b47d8b7b
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Nhat-Pham/workingset-refactor-LRU-refault-to-expose-refault-recency-check/20230204-030455
        git checkout 49a57ed71ac2c005231660c85c3f30c4b47d8b7b
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

   mm/filemap.c:4035:6: warning: no previous prototype for 'ksys_cachestat' [-Wmissing-prototypes]
    4035 | long ksys_cachestat(unsigned int fd, loff_t off, size_t len,
         |      ^~~~~~~~~~~~~~
   In file included from mm/filemap.c:25:
>> include/linux/syscalls.h:243:25: error: conflicting types for 'sys_cachestat'; have 'long int(unsigned int,  loff_t,  size_t,  struct cachestat *, unsigned int)' {aka 'long int(unsigned int,  long long int,  unsigned int,  struct cachestat *, unsigned int)'}
     243 |         asmlinkage long sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))       \
         |                         ^~~
   include/linux/syscalls.h:229:9: note: in expansion of macro '__SYSCALL_DEFINEx'
     229 |         __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
         |         ^~~~~~~~~~~~~~~~~
   include/linux/syscalls.h:222:36: note: in expansion of macro 'SYSCALL_DEFINEx'
     222 | #define SYSCALL_DEFINE5(name, ...) SYSCALL_DEFINEx(5, _##name, __VA_ARGS__)
         |                                    ^~~~~~~~~~~~~~~
   mm/filemap.c:4095:1: note: in expansion of macro 'SYSCALL_DEFINE5'
    4095 | SYSCALL_DEFINE5(cachestat, unsigned int, fd, loff_t, off, size_t, len,
         | ^~~~~~~~~~~~~~~
   include/linux/syscalls.h:1060:17: note: previous declaration of 'sys_cachestat' with type 'long int(unsigned int,  long unsigned int,  long unsigned int,  size_t,  struct cachestat *, unsigned int)' {aka 'long int(unsigned int,  long unsigned int,  long unsigned int,  unsigned int,  struct cachestat *, unsigned int)'}
    1060 | asmlinkage long sys_cachestat(unsigned int fd, unsigned long off_low,
         |                 ^~~~~~~~~~~~~


vim +243 include/linux/syscalls.h

1bd21c6c21e848 Dominik Brodowski   2018-04-05  232  
e145242ea0df6b Dominik Brodowski   2018-04-09  233  /*
e145242ea0df6b Dominik Brodowski   2018-04-09  234   * The asmlinkage stub is aliased to a function named __se_sys_*() which
e145242ea0df6b Dominik Brodowski   2018-04-09  235   * sign-extends 32-bit ints to longs whenever needed. The actual work is
e145242ea0df6b Dominik Brodowski   2018-04-09  236   * done within __do_sys_*().
e145242ea0df6b Dominik Brodowski   2018-04-09  237   */
1bd21c6c21e848 Dominik Brodowski   2018-04-05  238  #ifndef __SYSCALL_DEFINEx
bed1ffca022cc8 Frederic Weisbecker 2009-03-13  239  #define __SYSCALL_DEFINEx(x, name, ...)					\
bee20031772af3 Arnd Bergmann       2018-06-19  240  	__diag_push();							\
bee20031772af3 Arnd Bergmann       2018-06-19  241  	__diag_ignore(GCC, 8, "-Wattribute-alias",			\
bee20031772af3 Arnd Bergmann       2018-06-19  242  		      "Type aliasing is used to sanitize syscall arguments");\
83460ec8dcac14 Andi Kleen          2013-11-12 @243  	asmlinkage long sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))	\
e145242ea0df6b Dominik Brodowski   2018-04-09  244  		__attribute__((alias(__stringify(__se_sys##name))));	\
c9a211951c7c79 Howard McLauchlan   2018-03-21  245  	ALLOW_ERROR_INJECTION(sys##name, ERRNO);			\
e145242ea0df6b Dominik Brodowski   2018-04-09  246  	static inline long __do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
e145242ea0df6b Dominik Brodowski   2018-04-09  247  	asmlinkage long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__));	\
e145242ea0df6b Dominik Brodowski   2018-04-09  248  	asmlinkage long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__))	\
1a94bc34768e46 Heiko Carstens      2009-01-14  249  	{								\
e145242ea0df6b Dominik Brodowski   2018-04-09  250  		long ret = __do_sys##name(__MAP(x,__SC_CAST,__VA_ARGS__));\
07fe6e00f6cca6 Al Viro             2013-01-21  251  		__MAP(x,__SC_TEST,__VA_ARGS__);				\
2cf0966683430b Al Viro             2013-01-21  252  		__PROTECT(x, ret,__MAP(x,__SC_ARGS,__VA_ARGS__));	\
2cf0966683430b Al Viro             2013-01-21  253  		return ret;						\
1a94bc34768e46 Heiko Carstens      2009-01-14  254  	}								\
bee20031772af3 Arnd Bergmann       2018-06-19  255  	__diag_pop();							\
e145242ea0df6b Dominik Brodowski   2018-04-09  256  	static inline long __do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))
1bd21c6c21e848 Dominik Brodowski   2018-04-05  257  #endif /* __SYSCALL_DEFINEx */
1a94bc34768e46 Heiko Carstens      2009-01-14  258  

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