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Date:   Tue, 23 May 2023 03:00:19 +0800
From:   kernel test robot <lkp@intel.com>
To:     Christophe Leroy <christophe.leroy@csgroup.eu>
Cc:     llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev,
        linux-kernel@vger.kernel.org,
        Michael Ellerman <mpe@ellerman.id.au>,
        Nathan Chancellor <nathan@kernel.org>
Subject: arch/powerpc/math-emu/fcmpu.c:13:2: warning: variable 'A_c' set but
 not used
Message-ID: <202305230231.3Wb7Q68G-lkp@intel.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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Precedence: bulk

Hi Christophe,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   44c026a73be8038f03dbdeef028b642880cf1511
commit: 7245fc5bb7a966852d5bd7779d1f5855530b461a powerpc/math-emu: Remove -w build flag and fix warnings
date:   9 months ago
config: powerpc-randconfig-r022-20230522 (https://download.01.org/0day-ci/archive/20230523/202305230231.3Wb7Q68G-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project b0fb98227c90adf2536c9ad644a74d5e92961111)
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
        # install powerpc cross compiling tool for clang build
        # apt-get install binutils-powerpc-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7245fc5bb7a966852d5bd7779d1f5855530b461a
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 7245fc5bb7a966852d5bd7779d1f5855530b461a
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=powerpc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash arch/powerpc/math-emu/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202305230231.3Wb7Q68G-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> arch/powerpc/math-emu/fcmpu.c:13:2: warning: variable 'A_c' set but not used [-Wunused-but-set-variable]
           FP_DECL_D(A);
           ^
   include/math-emu/double.h:73:23: note: expanded from macro 'FP_DECL_D'
   #define FP_DECL_D(X)            _FP_DECL(2,X)
                                   ^
   include/math-emu/op-common.h:28:14: note: expanded from macro '_FP_DECL'
     _FP_I_TYPE X##_c=0, X##_s=0, X##_e=0; \
                ^
   <scratch space>:124:1: note: expanded from here
   A_c
   ^
>> arch/powerpc/math-emu/fcmpu.c:14:2: warning: variable 'B_c' set but not used [-Wunused-but-set-variable]
           FP_DECL_D(B);
           ^
   include/math-emu/double.h:73:23: note: expanded from macro 'FP_DECL_D'
   #define FP_DECL_D(X)            _FP_DECL(2,X)
                                   ^
   include/math-emu/op-common.h:28:14: note: expanded from macro '_FP_DECL'
     _FP_I_TYPE X##_c=0, X##_s=0, X##_e=0; \
                ^
   <scratch space>:130:1: note: expanded from here
   B_c
   ^
>> arch/powerpc/math-emu/fcmpu.c:15:2: warning: variable '_fex' set but not used [-Wunused-but-set-variable]
           FP_DECL_EX;
           ^
   include/math-emu/soft-fp.h:94:24: note: expanded from macro 'FP_DECL_EX'
   #define FP_DECL_EX int _fex = 0
                          ^
   arch/powerpc/math-emu/fcmpu.c:11:1: warning: no previous prototype for function 'fcmpu' [-Wmissing-prototypes]
   fcmpu(u32 *ccr, int crfD, void *frA, void *frB)
   ^
   arch/powerpc/math-emu/fcmpu.c:10:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int
   ^
   static 
   4 warnings generated.
--
>> arch/powerpc/math-emu/fctiw.c:14:2: warning: variable '_fex' set but not used [-Wunused-but-set-variable]
           FP_DECL_EX;
           ^
   include/math-emu/soft-fp.h:94:24: note: expanded from macro 'FP_DECL_EX'
   #define FP_DECL_EX int _fex = 0
                          ^
   arch/powerpc/math-emu/fctiw.c:11:1: warning: no previous prototype for function 'fctiw' [-Wmissing-prototypes]
   fctiw(u32 *frD, void *frB)
   ^
   arch/powerpc/math-emu/fctiw.c:10:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int
   ^
   static 
   2 warnings generated.
--
>> arch/powerpc/math-emu/fctiwz.c:14:2: warning: variable '_fex' set but not used [-Wunused-but-set-variable]
           FP_DECL_EX;
           ^
   include/math-emu/soft-fp.h:94:24: note: expanded from macro 'FP_DECL_EX'
   #define FP_DECL_EX int _fex = 0
                          ^
   arch/powerpc/math-emu/fctiwz.c:11:1: warning: no previous prototype for function 'fctiwz' [-Wmissing-prototypes]
   fctiwz(u32 *frD, void *frB)
   ^
   arch/powerpc/math-emu/fctiwz.c:10:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int
   ^
   static 
   2 warnings generated.
--
>> arch/powerpc/math-emu/fsel.c:14:2: warning: variable '_fex' set but not used [-Wunused-but-set-variable]
           FP_DECL_EX;
           ^
   include/math-emu/soft-fp.h:94:24: note: expanded from macro 'FP_DECL_EX'
   #define FP_DECL_EX int _fex = 0
                          ^
   arch/powerpc/math-emu/fsel.c:11:1: warning: no previous prototype for function 'fsel' [-Wmissing-prototypes]
   fsel(u32 *frD, void *frA, u32 *frB, u32 *frC)
   ^
   arch/powerpc/math-emu/fsel.c:10:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int
   ^
   static 
   2 warnings generated.


vim +/A_c +13 arch/powerpc/math-emu/fcmpu.c

^1da177e4c3f41 arch/ppc/math-emu/fcmpu.c     Linus Torvalds 2005-04-16   9  
^1da177e4c3f41 arch/ppc/math-emu/fcmpu.c     Linus Torvalds 2005-04-16  10  int
^1da177e4c3f41 arch/ppc/math-emu/fcmpu.c     Linus Torvalds 2005-04-16  11  fcmpu(u32 *ccr, int crfD, void *frA, void *frB)
^1da177e4c3f41 arch/ppc/math-emu/fcmpu.c     Linus Torvalds 2005-04-16  12  {
^1da177e4c3f41 arch/ppc/math-emu/fcmpu.c     Linus Torvalds 2005-04-16 @13  	FP_DECL_D(A);
^1da177e4c3f41 arch/ppc/math-emu/fcmpu.c     Linus Torvalds 2005-04-16 @14  	FP_DECL_D(B);
d2b194ed820880 arch/powerpc/math-emu/fcmpu.c Kumar Gala     2008-06-04 @15  	FP_DECL_EX;
^1da177e4c3f41 arch/ppc/math-emu/fcmpu.c     Linus Torvalds 2005-04-16  16  	int code[4] = { (1 << 3), (1 << 1), (1 << 2), (1 << 0) };
^1da177e4c3f41 arch/ppc/math-emu/fcmpu.c     Linus Torvalds 2005-04-16  17  	long cmp;
^1da177e4c3f41 arch/ppc/math-emu/fcmpu.c     Linus Torvalds 2005-04-16  18  

:::::: The code at line 13 was first introduced by commit
:::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2

:::::: TO: Linus Torvalds <torvalds@ppc970.osdl.org>
:::::: CC: Linus Torvalds <torvalds@ppc970.osdl.org>

-- 
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https://github.com/intel/lkp-tests/wiki