linux-kernel - arch/powerpc/kvm/../kernel/head_booke.h:20:6: warning: "THREAD

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Date:   Wed, 8 Feb 2023 10:51:11 +0800
From:   kernel test robot <lkp@...el.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: arch/powerpc/kvm/../kernel/head_booke.h:20:6: warning:
 "THREAD_SHIFT" is not defined, evaluates to 0

Hi Masahiro,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   0983f6bf2bfc0789b51ddf7315f644ff4da50acb
commit: 80b6093b55e31c2c40ff082fb32523d4e852954f kbuild: add -Wundef to KBUILD_CPPFLAGS for W=1 builds
date:   8 weeks ago
config: powerpc-randconfig-r015-20230208 (https://download.01.org/0day-ci/archive/20230208/202302081034.IDWxXcwG-lkp@intel.com/config)
compiler: powerpc-linux-gcc (GCC) 12.1.0
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/torvalds/linux.git/commit/?id=80b6093b55e31c2c40ff082fb32523d4e852954f
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 80b6093b55e31c2c40ff082fb32523d4e852954f
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=powerpc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash arch/powerpc/kernel/ arch/powerpc/kvm/ arch/powerpc/platforms/85xx/ arch/powerpc/sysdev/

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

All warnings (new ones prefixed by >>):

   In file included from arch/powerpc/kvm/bookehv_interrupts.S:26:
>> arch/powerpc/kvm/../kernel/head_booke.h:20:6: warning: "THREAD_SHIFT" is not defined, evaluates to 0 [-Wundef]
      20 | #if (THREAD_SHIFT < 15)
         |      ^~~~~~~~~~~~


vim +/THREAD_SHIFT +20 arch/powerpc/kvm/../kernel/head_booke.h

1a4b739bbb4f885 Christophe Leroy 2019-04-30  10  
63dafe5728e7354 Becky Bruce      2006-01-14  11  /*
63dafe5728e7354 Becky Bruce      2006-01-14  12   * Macros used for common Book-e exception handling
63dafe5728e7354 Becky Bruce      2006-01-14  13   */
63dafe5728e7354 Becky Bruce      2006-01-14  14  
63dafe5728e7354 Becky Bruce      2006-01-14  15  #define SET_IVOR(vector_number, vector_label)		\
63dafe5728e7354 Becky Bruce      2006-01-14  16  		li	r26,vector_label@l; 		\
63dafe5728e7354 Becky Bruce      2006-01-14  17  		mtspr	SPRN_IVOR##vector_number,r26;	\
63dafe5728e7354 Becky Bruce      2006-01-14  18  		sync
63dafe5728e7354 Becky Bruce      2006-01-14  19  
e12401222f749c3 Yuri Tikhonov    2009-01-29 @20  #if (THREAD_SHIFT < 15)
e12401222f749c3 Yuri Tikhonov    2009-01-29  21  #define ALLOC_STACK_FRAME(reg, val)			\
e12401222f749c3 Yuri Tikhonov    2009-01-29  22  	addi reg,reg,val
e12401222f749c3 Yuri Tikhonov    2009-01-29  23  #else
e12401222f749c3 Yuri Tikhonov    2009-01-29  24  #define ALLOC_STACK_FRAME(reg, val)			\
e12401222f749c3 Yuri Tikhonov    2009-01-29  25  	addis	reg,reg,val@ha;				\
e12401222f749c3 Yuri Tikhonov    2009-01-29  26  	addi	reg,reg,val@l
e12401222f749c3 Yuri Tikhonov    2009-01-29  27  #endif
e12401222f749c3 Yuri Tikhonov    2009-01-29  28  

:::::: The code at line 20 was first introduced by commit
:::::: e12401222f749c37277a313d631dc024bbfd3b00 powerpc/44x: Support for 256KB PAGE_SIZE

:::::: TO: Yuri Tikhonov <yur@...raft.com>
:::::: CC: Josh Boyer <jwboyer@...ux.vnet.ibm.com>

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests