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SubjectRe: [PATCH] xfs: Fix xfs_dir2_sf_entry_t size check
Hi Vincenzo,

I love your patch! Yet something to improve:

[auto build test ERROR on xfs-linux/for-next]
[also build test ERROR on djwong-xfs/djwong-devel v5.5-rc5 next-20200110]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url: https://github.com/0day-ci/linux/commits/Vincenzo-Frascino/xfs-Fix-xfs_dir2_sf_entry_t-size-check/20200110-144608
base: https://git.kernel.org/pub/scm/fs/xfs/xfs-linux.git for-next
config: x86_64-lkp (attached as .config)
compiler: gcc-7 (Debian 7.5.0-3) 7.5.0
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64

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

All errors (new ones prefixed by >>):

In file included from include/linux/string.h:6:0,
from include/linux/uuid.h:12,
from fs/xfs/xfs_linux.h:10,
from fs/xfs/xfs.h:22,
from fs/xfs/xfs_super.c:7:
In function 'xfs_check_ondisk_structs',
inlined from 'init_xfs_fs' at fs/xfs/xfs_super.c:2025:2:
>> include/linux/compiler.h:350:38: error: call to '__compiletime_assert_107' declared with attribute error: XFS: sizeof(xfs_dir2_sf_entry_t) is wrong, expected 4
_compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
^
include/linux/compiler.h:331:4: note: in definition of macro '__compiletime_assert'
prefix ## suffix(); \
^~~~~~
include/linux/compiler.h:350:2: note: in expansion of macro '_compiletime_assert'
_compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
^~~~~~~~~~~~~~~~~~~
include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
#define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
^~~~~~~~~~~~~~~~~~
fs/xfs/xfs_ondisk.h:10:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
BUILD_BUG_ON_MSG(sizeof(structname) != (size), "XFS: sizeof(" \
^~~~~~~~~~~~~~~~
fs/xfs/xfs_ondisk.h:107:2: note: in expansion of macro 'XFS_CHECK_STRUCT_SIZE'
XFS_CHECK_STRUCT_SIZE(xfs_dir2_sf_entry_t, 4);
^~~~~~~~~~~~~~~~~~~~~
--
In file included from include/linux/string.h:6:0,
from include/linux/uuid.h:12,
from fs//xfs/xfs_linux.h:10,
from fs//xfs/xfs.h:22,
from fs//xfs/xfs_super.c:7:
In function 'xfs_check_ondisk_structs',
inlined from 'init_xfs_fs' at fs//xfs/xfs_super.c:2025:2:
>> include/linux/compiler.h:350:38: error: call to '__compiletime_assert_107' declared with attribute error: XFS: sizeof(xfs_dir2_sf_entry_t) is wrong, expected 4
_compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
^
include/linux/compiler.h:331:4: note: in definition of macro '__compiletime_assert'
prefix ## suffix(); \
^~~~~~
include/linux/compiler.h:350:2: note: in expansion of macro '_compiletime_assert'
_compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
^~~~~~~~~~~~~~~~~~~
include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
#define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
^~~~~~~~~~~~~~~~~~
fs//xfs/xfs_ondisk.h:10:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
BUILD_BUG_ON_MSG(sizeof(structname) != (size), "XFS: sizeof(" \
^~~~~~~~~~~~~~~~
fs//xfs/xfs_ondisk.h:107:2: note: in expansion of macro 'XFS_CHECK_STRUCT_SIZE'
XFS_CHECK_STRUCT_SIZE(xfs_dir2_sf_entry_t, 4);
^~~~~~~~~~~~~~~~~~~~~

vim +/__compiletime_assert_107 +350 include/linux/compiler.h

9a8ab1c39970a4 Daniel Santos 2013-02-21 336
9a8ab1c39970a4 Daniel Santos 2013-02-21 337 #define _compiletime_assert(condition, msg, prefix, suffix) \
9a8ab1c39970a4 Daniel Santos 2013-02-21 338 __compiletime_assert(condition, msg, prefix, suffix)
9a8ab1c39970a4 Daniel Santos 2013-02-21 339
9a8ab1c39970a4 Daniel Santos 2013-02-21 340 /**
9a8ab1c39970a4 Daniel Santos 2013-02-21 341 * compiletime_assert - break build and emit msg if condition is false
9a8ab1c39970a4 Daniel Santos 2013-02-21 342 * @condition: a compile-time constant condition to check
9a8ab1c39970a4 Daniel Santos 2013-02-21 343 * @msg: a message to emit if condition is false
9a8ab1c39970a4 Daniel Santos 2013-02-21 344 *
9a8ab1c39970a4 Daniel Santos 2013-02-21 345 * In tradition of POSIX assert, this macro will break the build if the
9a8ab1c39970a4 Daniel Santos 2013-02-21 346 * supplied condition is *false*, emitting the supplied error message if the
9a8ab1c39970a4 Daniel Santos 2013-02-21 347 * compiler has support to do so.
9a8ab1c39970a4 Daniel Santos 2013-02-21 348 */
9a8ab1c39970a4 Daniel Santos 2013-02-21 349 #define compiletime_assert(condition, msg) \
9a8ab1c39970a4 Daniel Santos 2013-02-21 @350 _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
9a8ab1c39970a4 Daniel Santos 2013-02-21 351

:::::: The code at line 350 was first introduced by commit
:::::: 9a8ab1c39970a4938a72d94e6fd13be88a797590 bug.h, compiler.h: introduce compiletime_assert & BUILD_BUG_ON_MSG

:::::: TO: Daniel Santos <daniel.santos@pobox.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org Intel Corporation
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