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

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Message-ID: <20230407231500.GA2598451@dev-arch.thelio-3990X>
Date:   Fri, 7 Apr 2023 16:15:00 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        kernel test robot <lkp@...el.com>
Subject: Re: arch/powerpc/kvm/../kernel/head_booke.h:20:6: warning:
 "THREAD_SHIFT" is not defined, evaluates to 0

On Fri, Apr 07, 2023 at 04:08:43PM -0700, Nick Desaulniers wrote:
> On Tue, Apr 4, 2023 at 6:29 PM kernel test robot <lkp@...el.com> wrote:
> >
> > Hi Masahiro,
> >
> > FYI, the error/warning still remains.
> >
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head:   76f598ba7d8e2bfb4855b5298caedd5af0c374a8
> > commit: 80b6093b55e31c2c40ff082fb32523d4e852954f kbuild: add -Wundef to KBUILD_CPPFLAGS for W=1 builds
> > date:   4 months ago
> > config: powerpc-buildonly-randconfig-r003-20230405 (https://download.01.org/0day-ci/archive/20230405/202304050954.yskLdczH-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/ virt/
> >
> > If you fix the issue, kindly add following tag where applicable
> > | Reported-by: kernel test robot <lkp@...el.com>
> > | Link: https://lore.kernel.org/oe-kbuild-all/202304050954.yskLdczH-lkp@intel.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)
> >          |      ^~~~~~~~~~~~
> 
> Should arch/powerpc/kernel/head_booke.h be #include'ing
> asm/thread_info.h before using THREAD_SHIFT?

I think so, sorry for not cc'ing you on
https://lore.kernel.org/linuxppc-dev/20230406-wundef-thread_shift_booke-v1-1-8deffa4d84f9@kernel.org/

> >
> >
> > vim +/THREAD_SHIFT +20 arch/powerpc/kvm/../kernel/head_booke.h
> >
> > 1a4b739bbb4f88 Christophe Leroy 2019-04-30  10
> > 63dafe5728e735 Becky Bruce      2006-01-14  11  /*
> > 63dafe5728e735 Becky Bruce      2006-01-14  12   * Macros used for common Book-e exception handling
> > 63dafe5728e735 Becky Bruce      2006-01-14  13   */
> > 63dafe5728e735 Becky Bruce      2006-01-14  14
> > 63dafe5728e735 Becky Bruce      2006-01-14  15  #define SET_IVOR(vector_number, vector_label)           \
> > 63dafe5728e735 Becky Bruce      2006-01-14  16                  li      r26,vector_label@l;             \
> > 63dafe5728e735 Becky Bruce      2006-01-14  17                  mtspr   SPRN_IVOR##vector_number,r26;   \
> > 63dafe5728e735 Becky Bruce      2006-01-14  18                  sync
> > 63dafe5728e735 Becky Bruce      2006-01-14  19
> > e12401222f749c Yuri Tikhonov    2009-01-29 @20  #if (THREAD_SHIFT < 15)
> > e12401222f749c Yuri Tikhonov    2009-01-29  21  #define ALLOC_STACK_FRAME(reg, val)                     \
> > e12401222f749c Yuri Tikhonov    2009-01-29  22          addi reg,reg,val
> > e12401222f749c Yuri Tikhonov    2009-01-29  23  #else
> > e12401222f749c Yuri Tikhonov    2009-01-29  24  #define ALLOC_STACK_FRAME(reg, val)                     \
> > e12401222f749c Yuri Tikhonov    2009-01-29  25          addis   reg,reg,val@ha;                         \
> > e12401222f749c Yuri Tikhonov    2009-01-29  26          addi    reg,reg,val@l
> > e12401222f749c Yuri Tikhonov    2009-01-29  27  #endif
> > e12401222f749c 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
> 
> 
> 
> -- 
> Thanks,
> ~Nick Desaulniers