diff options
| author | Nicholas Piggin <npiggin@gmail.com> | 2023-04-26 07:58:39 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2023-04-26 08:21:33 +0200 |
| commit | 169f8997968ab620d750d9a45e15c5288d498356 (patch) | |
| tree | 8d1bb8c8c1bca78de830a0004d64be93bd9da227 /arch/powerpc/Kconfig | |
| parent | powerpc: Fix merge conflict between pcrel and copy_thread changes (diff) | |
| download | linux-169f8997968ab620d750d9a45e15c5288d498356.tar.xz linux-169f8997968ab620d750d9a45e15c5288d498356.zip | |
powerpc/64s: Disable pcrel code model on Clang
Clang has a bug that casues the pcrel code model not to be used when any of
-msoft-float, -mno-altivec, or -mno-vsx are set. Leaving these off causes
FP/vector instructions to be generated, causing crashes. So disable pcrel
for clang for now.
Fixes: 7e3a68be42e10 ("powerpc/64: vmlinux support building with PCREL addresing")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230426055848.402993-3-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/Kconfig')
| -rw-r--r-- | arch/powerpc/Kconfig | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 7a0f25a09759..520e577f3106 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -8,7 +8,12 @@ config CC_HAS_PREFIXED def_bool PPC64 && $(cc-option, -mcpu=power10 -mprefixed) config CC_HAS_PCREL - def_bool PPC64 && $(cc-option, -mcpu=power10 -mpcrel) + # Clang has a bug (https://github.com/llvm/llvm-project/issues/62372) + # where pcrel code is not generated if -msoft-float, -mno-altivec, or + # -mno-vsx options are also given. Without these options, fp/vec + # instructions are generated from regular kernel code. So Clang can't + # do pcrel yet. + def_bool PPC64 && CC_IS_GCC && $(cc-option, -mcpu=power10 -mpcrel) config 32BIT bool |