linux-kernel - [brauner:pidfd.pidfd_get_task 2/2] mm/madvise.c:1241:22: error: unused variable 'f

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Date:   Tue, 14 Sep 2021 08:45:35 +0800
From:   kernel test robot <lkp@...el.com>
To:     Christian Brauner <christian.brauner@...ntu.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [brauner:pidfd.pidfd_get_task 2/2] mm/madvise.c:1241:22: error:
 unused variable 'f_flags'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux.git pidfd.pidfd_get_task
head:   fd3fd0b4eb17f0ef3605d7bfd85ef7c97b93ec61
commit: fd3fd0b4eb17f0ef3605d7bfd85ef7c97b93ec61 [2/2] mm: use pidfd_get_task()
config: nios2-allyesconfig (attached as .config)
compiler: nios2-linux-gcc (GCC) 11.2.0
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://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux.git/commit/?id=fd3fd0b4eb17f0ef3605d7bfd85ef7c97b93ec61
        git remote add brauner https://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux.git
        git fetch --no-tags brauner pidfd.pidfd_get_task
        git checkout fd3fd0b4eb17f0ef3605d7bfd85ef7c97b93ec61
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=nios2 

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

All errors (new ones prefixed by >>):

   mm/madvise.c: In function '__do_sys_process_madvise':
>> mm/madvise.c:1241:22: error: unused variable 'f_flags' [-Werror=unused-variable]
    1241 |         unsigned int f_flags;
         |                      ^~~~~~~
   cc1: all warnings being treated as errors


vim +/f_flags +1241 mm/madvise.c

ecb8ac8b1f1469 Minchan Kim 2020-10-17  1230  
ecb8ac8b1f1469 Minchan Kim 2020-10-17  1231  SYSCALL_DEFINE5(process_madvise, int, pidfd, const struct iovec __user *, vec,
ecb8ac8b1f1469 Minchan Kim 2020-10-17  1232  		size_t, vlen, int, behavior, unsigned int, flags)
ecb8ac8b1f1469 Minchan Kim 2020-10-17  1233  {
ecb8ac8b1f1469 Minchan Kim 2020-10-17  1234  	ssize_t ret;
ecb8ac8b1f1469 Minchan Kim 2020-10-17  1235  	struct iovec iovstack[UIO_FASTIOV], iovec;
ecb8ac8b1f1469 Minchan Kim 2020-10-17  1236  	struct iovec *iov = iovstack;
ecb8ac8b1f1469 Minchan Kim 2020-10-17  1237  	struct iov_iter iter;
ecb8ac8b1f1469 Minchan Kim 2020-10-17  1238  	struct task_struct *task;
ecb8ac8b1f1469 Minchan Kim 2020-10-17  1239  	struct mm_struct *mm;
ecb8ac8b1f1469 Minchan Kim 2020-10-17  1240  	size_t total_len;
ecb8ac8b1f1469 Minchan Kim 2020-10-17 @1241  	unsigned int f_flags;

:::::: The code at line 1241 was first introduced by commit
:::::: ecb8ac8b1f146915aa6b96449b66dd48984caacc mm/madvise: introduce process_madvise() syscall: an external memory hinting API

:::::: TO: Minchan Kim <minchan@...nel.org>
:::::: CC: Linus Torvalds <torvalds@...ux-foundation.org>

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

Download attachment ".config.gz" of type "application/gzip" (60771 bytes)