[powerpc:next-test 60/60] arch/powerpc/kernel/misc_32.S:240: Error: unrecognized opcode: `emit_warn_entry'

[powerpc:next-test 60/60] arch/powerpc/kernel/misc_32.S:240: Error: unrecognized opcode: `emit_warn_entry'

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next-test
head:   5e3aa4531ecc7febbfa18218145c903dab17e651
commit: 5e3aa4531ecc7febbfa18218145c903dab17e651 [60/60] powerpc/bug: Provide better flexibility to WARN_ON/__WARN_FLAGS() with asm goto
config: powerpc64-buildonly-randconfig-r001-20210810 (attached as .config)
compiler: powerpc-linux-gcc (GCC) 10.3.0
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
        # https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=5e3aa4531ecc7febbfa18218145c903dab17e651
        git remote add powerpc https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git
        git fetch --no-tags powerpc next-test
        git checkout 5e3aa4531ecc7febbfa18218145c903dab17e651
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross O=build_dir ARCH=powerpc SHELL=/bin/bash arch/powerpc/

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

All errors (new ones prefixed by >>):

   arch/powerpc/kernel/misc_32.S: Assembler messages:
>> arch/powerpc/kernel/misc_32.S:240: Error: unrecognized opcode: `emit_warn_entry'


vim +240 arch/powerpc/kernel/misc_32.S

   218	
   219	/*
   220	 * Copy a whole page.  We use the dcbz instruction on the destination
   221	 * to reduce memory traffic (it eliminates the unnecessary reads of
   222	 * the destination into cache).  This requires that the destination
   223	 * is cacheable.
   224	 */
   225	#define COPY_16_BYTES		\
   226		lwz	r6,4(r4);	\
   227		lwz	r7,8(r4);	\
   228		lwz	r8,12(r4);	\
   229		lwzu	r9,16(r4);	\
   230		stw	r6,4(r3);	\
   231		stw	r7,8(r3);	\
   232		stw	r8,12(r3);	\
   233		stwu	r9,16(r3)
   234	
   235	_GLOBAL(copy_page)
   236		rlwinm	r5, r3, 0, L1_CACHE_BYTES - 1
   237		addi	r3,r3,-4
   238	
   239	0:	twnei	r5, 0	/* WARN if r3 is not cache aligned */
 > 240		EMIT_WARN_ENTRY 0b,__FILE__,__LINE__, BUGFLAG_WARNING
   241	
   242		addi	r4,r4,-4
   243	
   244		li	r5,4
   245	

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

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Re: [powerpc:next-test 60/60] arch/powerpc/kernel/misc_32.S:240: Error: unrecognized opcode: `emit_warn_entry'

[Christophe Leroy]

Le 10/08/2021 à 20:10, kernel test robot a écrit :
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next-test
> head:   5e3aa4531ecc7febbfa18218145c903dab17e651
> commit: 5e3aa4531ecc7febbfa18218145c903dab17e651 [60/60] powerpc/bug: Provide better flexibility to WARN_ON/__WARN_FLAGS() with asm goto
> config: powerpc64-buildonly-randconfig-r001-20210810 (attached as .config)
> compiler: powerpc-linux-gcc (GCC) 10.3.0
> 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
>          # https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=5e3aa4531ecc7febbfa18218145c903dab17e651
>          git remote add powerpc https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git
>          git fetch --no-tags powerpc next-test
>          git checkout 5e3aa4531ecc7febbfa18218145c903dab17e651
>          # save the attached .config to linux build tree
>          mkdir build_dir
>          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross O=build_dir ARCH=powerpc SHELL=/bin/bash arch/powerpc/
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@intel.com>
> 
> All errors (new ones prefixed by >>):
> 
>     arch/powerpc/kernel/misc_32.S: Assembler messages:
>>> arch/powerpc/kernel/misc_32.S:240: Error: unrecognized opcode: `emit_warn_entry'

We are missing stubs when CONFIG_BUG is not selected.

The following show fix it:

diff --git a/arch/powerpc/include/asm/bug.h b/arch/powerpc/include/asm/bug.h
index f36b872cb571..1ee0f22313ee 100644
--- a/arch/powerpc/include/asm/bug.h
+++ b/arch/powerpc/include/asm/bug.h
@@ -137,8 +137,11 @@ __label_warn_on:						\
  #ifdef __ASSEMBLY__
  .macro EMIT_BUG_ENTRY addr,file,line,flags
  .endm
+.macro EMIT_WARN_ENTRY addr,file,line,flags
+.endm
  #else /* !__ASSEMBLY__ */
  #define _EMIT_BUG_ENTRY
+#define _EMIT_WARN_ENTRY
  #endif
  #endif /* CONFIG_BUG */