[brauner-vfs:vfs-6.15.pidfs 3/3] fs/pidfs.c:868:2: error: call to '__compiletime_assert_339' declared with 'error' attribute: BUILD_BUG_ON failed: O_DSYNC != CLONE_PIDFD

[brauner-vfs:vfs-6.15.pidfs 3/3] fs/pidfs.c:868:2: error: call to '__compiletime_assert_339' declared with 'error' attribute: BUILD_BUG_ON failed: O_DSYNC != CLONE_PIDFD

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git vfs-6.15.pidfs
head:   b0f4119d8b2a680c8cd019f41c64e8b5444c6b83
commit: b0f4119d8b2a680c8cd019f41c64e8b5444c6b83 [3/3] pidfs: ensure that PIDFS_INFO_EXIT is available
config: mips-bcm47xx_defconfig (https://download.01.org/0day-ci/archive/20250317/202503171528.azXWAvUl-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250317/202503171528.azXWAvUl-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202503171528.azXWAvUl-lkp@intel.com/

All errors (new ones prefixed by >>):

>> fs/pidfs.c:868:2: error: call to '__compiletime_assert_339' declared with 'error' attribute: BUILD_BUG_ON failed: O_DSYNC != CLONE_PIDFD
     868 |         BUILD_BUG_ON(O_DSYNC != CLONE_PIDFD);
         |         ^
   include/linux/build_bug.h:50:2: note: expanded from macro 'BUILD_BUG_ON'
      50 |         BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
         |         ^
   include/linux/build_bug.h:39:37: note: expanded from macro 'BUILD_BUG_ON_MSG'
      39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
         |                                     ^
   include/linux/compiler_types.h:542:2: note: expanded from macro 'compiletime_assert'
     542 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |         ^
   include/linux/compiler_types.h:530:2: note: expanded from macro '_compiletime_assert'
     530 |         __compiletime_assert(condition, msg, prefix, suffix)
         |         ^
   include/linux/compiler_types.h:523:4: note: expanded from macro '__compiletime_assert'
     523 |                         prefix ## suffix();                             \
         |                         ^
   <scratch space>:107:1: note: expanded from here
     107 | __compiletime_assert_339
         | ^
   1 error generated.


vim +868 fs/pidfs.c

   862	
   863		struct file *pidfd_file;
   864		struct path path __free(path_put) = {};
   865		unsigned int pidfd_flags = (flags & ~CLONE_PIDFD);
   866		int ret;
   867	
 > 868		BUILD_BUG_ON(O_DSYNC != CLONE_PIDFD);
   869	
   870		ret = path_from_stashed(&pid->stashed, pidfs_mnt, get_pid(pid), &path);
   871		if (ret < 0)
   872			return ERR_PTR(ret);
   873	
   874		if (!pidfs_pid_valid(pid, &path, flags))
   875			return ERR_PTR(-ESRCH);
   876	
   877		pidfd_file = dentry_open(&path, pidfd_flags, current_cred());
   878		/* Raise PIDFD_THREAD explicitly as do_dentry_open() strips it. */
   879		if (!IS_ERR(pidfd_file))
   880			pidfd_file->f_flags |= (pidfd_flags & PIDFD_THREAD);
   881	
   882		return pidfd_file;
   883	}
   884	

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