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Date:   Sun, 24 May 2020 23:15:45 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Christophe Leroy <christophe.leroy@....fr>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>
Subject: include/linux/compiler.h:344:38: error: call to
 '__compiletime_assert_172' declared with attribute error: BUILD_BUG_ON
 failed: KASAN_SHADOW_START & ~PGDIR_MASK

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   051143e1602d90ea71887d92363edd539d411de5
commit: 305d60012304684bd59ea1f67703e51662e4906a powerpc/kasan: add missing/lost Makefile
config: powerpc-randconfig-r024-20200522 (attached as .config)
compiler: powerpc-linux-gcc (GCC) 9.3.0
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
        git checkout 305d60012304684bd59ea1f67703e51662e4906a
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc 

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

All error/warnings (new ones prefixed by >>, old ones prefixed by <<):

arch/powerpc/mm/kasan/kasan_init_32.c:135:7: warning: no previous prototype for 'module_alloc' [-Wmissing-prototypes]
135 | void *module_alloc(unsigned long size)
|       ^~~~~~~~~~~~
In file included from include/linux/kernel.h:11,
from arch/powerpc/include/asm/page.h:15,
from arch/powerpc/include/asm/kasan.h:17,
from include/linux/kasan.h:14,
from arch/powerpc/mm/kasan/kasan_init_32.c:5:
arch/powerpc/mm/kasan/kasan_init_32.c: In function 'kasan_early_init':
>> include/linux/compiler.h:344:38: error: call to '__compiletime_assert_172' declared with attribute error: BUILD_BUG_ON failed: KASAN_SHADOW_START & ~PGDIR_MASK
344 |  _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
|                                      ^
include/linux/compiler.h:325:4: note: in definition of macro '__compiletime_assert'
325 |    prefix ## suffix();             |    ^~~~~~
include/linux/compiler.h:344:2: note: in expansion of macro '_compiletime_assert'
344 |  _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
|  ^~~~~~~~~~~~~~~~~~~
include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
|                                     ^~~~~~~~~~~~~~~~~~
include/linux/build_bug.h:50:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
50 |  BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
|  ^~~~~~~~~~~~~~~~
>> arch/powerpc/mm/kasan/kasan_init_32.c:172:2: note: in expansion of macro 'BUILD_BUG_ON'
172 |  BUILD_BUG_ON(KASAN_SHADOW_START & ~PGDIR_MASK);
|  ^~~~~~~~~~~~

# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=305d60012304684bd59ea1f67703e51662e4906a
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git remote update linus
git checkout 305d60012304684bd59ea1f67703e51662e4906a
vim +/__compiletime_assert_172 +344 include/linux/compiler.h

9a8ab1c39970a4 Daniel Santos 2013-02-21  330  
9a8ab1c39970a4 Daniel Santos 2013-02-21  331  #define _compiletime_assert(condition, msg, prefix, suffix) \
9a8ab1c39970a4 Daniel Santos 2013-02-21  332  	__compiletime_assert(condition, msg, prefix, suffix)
9a8ab1c39970a4 Daniel Santos 2013-02-21  333  
9a8ab1c39970a4 Daniel Santos 2013-02-21  334  /**
9a8ab1c39970a4 Daniel Santos 2013-02-21  335   * compiletime_assert - break build and emit msg if condition is false
9a8ab1c39970a4 Daniel Santos 2013-02-21  336   * @condition: a compile-time constant condition to check
9a8ab1c39970a4 Daniel Santos 2013-02-21  337   * @msg:       a message to emit if condition is false
9a8ab1c39970a4 Daniel Santos 2013-02-21  338   *
9a8ab1c39970a4 Daniel Santos 2013-02-21  339   * In tradition of POSIX assert, this macro will break the build if the
9a8ab1c39970a4 Daniel Santos 2013-02-21  340   * supplied condition is *false*, emitting the supplied error message if the
9a8ab1c39970a4 Daniel Santos 2013-02-21  341   * compiler has support to do so.
9a8ab1c39970a4 Daniel Santos 2013-02-21  342   */
9a8ab1c39970a4 Daniel Santos 2013-02-21  343  #define compiletime_assert(condition, msg) \
9a8ab1c39970a4 Daniel Santos 2013-02-21 @344  	_compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
9a8ab1c39970a4 Daniel Santos 2013-02-21  345  

:::::: The code at line 344 was first introduced by commit
:::::: 9a8ab1c39970a4938a72d94e6fd13be88a797590 bug.h, compiler.h: introduce compiletime_assert & BUILD_BUG_ON_MSG

:::::: TO: Daniel Santos <daniel.santos@...ox.com>
:::::: 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

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