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Date: Sat, 8 Jul 2023 10:44:25 +0000
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: kernel test robot <lkp@...el.com>
CC: "llvm@...ts.linux.dev" <llvm@...ts.linux.dev>,
"oe-kbuild-all@...ts.linux.dev" <oe-kbuild-all@...ts.linux.dev>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Michael Ellerman <mpe@...erman.id.au>,
Nathan Chancellor <nathan@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: arch/powerpc/math-emu/fsel.c:14:2: warning: variable '_fex' set
but not used
Le 07/07/2023 à 23:03, kernel test robot a écrit :
> Hi Christophe,
>
> First bad commit (maybe != root cause):
>
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head: 4f6b6c2b2f86b7878a770736bf478d8a263ff0bc
> commit: 7245fc5bb7a966852d5bd7779d1f5855530b461a powerpc/math-emu: Remove -w build flag and fix warnings
> date: 10 months ago
> config: powerpc-randconfig-r033-20230708 (https://download.01.org/0day-ci/archive/20230708/202307080446.rpYEMqQ2-lkp@intel.com/config)
> compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
> reproduce: (https://download.01.org/0day-ci/archive/20230708/202307080446.rpYEMqQ2-lkp@intel.com/reproduce)
That's a bug in CLANG, see https://github.com/llvm/llvm-project/issues/63315
Thanks
Christophe
>
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202307080446.rpYEMqQ2-lkp@intel.com/
>
> All warnings (new ones prefixed by >>):
>
>>> arch/powerpc/math-emu/fsel.c:14:2: warning: variable '_fex' set but not used [-Wunused-but-set-variable]
> 14 | FP_DECL_EX;
> | ^
> include/math-emu/soft-fp.h:94:24: note: expanded from macro 'FP_DECL_EX'
> 94 | #define FP_DECL_EX int _fex = 0
> | ^
> arch/powerpc/math-emu/fsel.c:11:1: warning: no previous prototype for function 'fsel' [-Wmissing-prototypes]
> 11 | 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
> 10 | int
> | ^
> | static
> 2 warnings generated.
> --
>>> arch/powerpc/math-emu/fcmpu.c:13:2: warning: variable 'A_c' set but not used [-Wunused-but-set-variable]
> 13 | FP_DECL_D(A);
> | ^
> include/math-emu/double.h:73:23: note: expanded from macro 'FP_DECL_D'
> 73 | #define FP_DECL_D(X) _FP_DECL(2,X)
> | ^
> include/math-emu/op-common.h:28:14: note: expanded from macro '_FP_DECL'
> 28 | _FP_I_TYPE X##_c=0, X##_s=0, X##_e=0; \
> | ^
> <scratch space>:171:1: note: expanded from here
> 171 | A_c
> | ^
>>> arch/powerpc/math-emu/fcmpu.c:14:2: warning: variable 'B_c' set but not used [-Wunused-but-set-variable]
> 14 | FP_DECL_D(B);
> | ^
> include/math-emu/double.h:73:23: note: expanded from macro 'FP_DECL_D'
> 73 | #define FP_DECL_D(X) _FP_DECL(2,X)
> | ^
> include/math-emu/op-common.h:28:14: note: expanded from macro '_FP_DECL'
> 28 | _FP_I_TYPE X##_c=0, X##_s=0, X##_e=0; \
> | ^
> <scratch space>:177:1: note: expanded from here
> 177 | B_c
> | ^
>>> arch/powerpc/math-emu/fcmpu.c:15:2: warning: variable '_fex' set but not used [-Wunused-but-set-variable]
> 15 | FP_DECL_EX;
> | ^
> include/math-emu/soft-fp.h:94:24: note: expanded from macro 'FP_DECL_EX'
> 94 | #define FP_DECL_EX int _fex = 0
> | ^
> arch/powerpc/math-emu/fcmpu.c:11:1: warning: no previous prototype for function 'fcmpu' [-Wmissing-prototypes]
> 11 | 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
> 10 | int
> | ^
> | static
> 4 warnings generated.
> --
>>> arch/powerpc/math-emu/fctiwz.c:14:2: warning: variable '_fex' set but not used [-Wunused-but-set-variable]
> 14 | FP_DECL_EX;
> | ^
> include/math-emu/soft-fp.h:94:24: note: expanded from macro 'FP_DECL_EX'
> 94 | #define FP_DECL_EX int _fex = 0
> | ^
> arch/powerpc/math-emu/fctiwz.c:11:1: warning: no previous prototype for function 'fctiwz' [-Wmissing-prototypes]
> 11 | 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
> 10 | int
> | ^
> | static
> 2 warnings generated.
> --
>>> arch/powerpc/math-emu/fctiw.c:14:2: warning: variable '_fex' set but not used [-Wunused-but-set-variable]
> 14 | FP_DECL_EX;
> | ^
> include/math-emu/soft-fp.h:94:24: note: expanded from macro 'FP_DECL_EX'
> 94 | #define FP_DECL_EX int _fex = 0
> | ^
> arch/powerpc/math-emu/fctiw.c:11:1: warning: no previous prototype for function 'fctiw' [-Wmissing-prototypes]
> 11 | 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
> 10 | int
> | ^
> | static
> 2 warnings generated.
>
>
> vim +/_fex +14 arch/powerpc/math-emu/fsel.c
>
> ^1da177e4c3f41 arch/ppc/math-emu/fsel.c Linus Torvalds 2005-04-16 9
> ^1da177e4c3f41 arch/ppc/math-emu/fsel.c Linus Torvalds 2005-04-16 10 int
> ^1da177e4c3f41 arch/ppc/math-emu/fsel.c Linus Torvalds 2005-04-16 11 fsel(u32 *frD, void *frA, u32 *frB, u32 *frC)
> ^1da177e4c3f41 arch/ppc/math-emu/fsel.c Linus Torvalds 2005-04-16 12 {
> ^1da177e4c3f41 arch/ppc/math-emu/fsel.c Linus Torvalds 2005-04-16 13 FP_DECL_D(A);
> d2b194ed820880 arch/powerpc/math-emu/fsel.c Kumar Gala 2008-06-04 @14 FP_DECL_EX;
> ^1da177e4c3f41 arch/ppc/math-emu/fsel.c Linus Torvalds 2005-04-16 15
>
> :::::: The code at line 14 was first introduced by commit
> :::::: d2b194ed820880eb19c43b9c10d9f5f30026ee54 powerpc/math-emu: Use kernel generic math-emu code
>
> :::::: TO: Kumar Gala <galak@...nel.crashing.org>
> :::::: CC: Kumar Gala <galak@...nel.crashing.org>
>
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