Hi, Samuel, On Thu, Dec 28, 2023 at 9:42 AM Samuel Holland <samuel.holland@xxxxxxxxxx> wrote: > > LoongArch already provides kernel_fpu_begin() and kernel_fpu_end() in > asm/fpu.h, so it only needs to add kernel_fpu_available() and export > the CFLAGS adjustments. > > Acked-by: WANG Xuerui <git@xxxxxxxxxx> > Reviewed-by: Christoph Hellwig <hch@xxxxxx> > Signed-off-by: Samuel Holland <samuel.holland@xxxxxxxxxx> > --- > > (no changes since v1) > > arch/loongarch/Kconfig | 1 + > arch/loongarch/Makefile | 5 ++++- > arch/loongarch/include/asm/fpu.h | 1 + > 3 files changed, 6 insertions(+), 1 deletion(-) > > diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig > index ee123820a476..65d4475565b8 100644 > --- a/arch/loongarch/Kconfig > +++ b/arch/loongarch/Kconfig > @@ -15,6 +15,7 @@ config LOONGARCH > select ARCH_HAS_CPU_FINALIZE_INIT > select ARCH_HAS_FORTIFY_SOURCE > select ARCH_HAS_KCOV > + select ARCH_HAS_KERNEL_FPU_SUPPORT if CPU_HAS_FPU > select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS > select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE > select ARCH_HAS_PTE_SPECIAL > diff --git a/arch/loongarch/Makefile b/arch/loongarch/Makefile > index 4ba8d67ddb09..1afe28feaba5 100644 > --- a/arch/loongarch/Makefile > +++ b/arch/loongarch/Makefile > @@ -25,6 +25,9 @@ endif > 32bit-emul = elf32loongarch > 64bit-emul = elf64loongarch > > +CC_FLAGS_FPU := -mfpu=64 > +CC_FLAGS_NO_FPU := -msoft-float We will add LoongArch32 support later, maybe it should be -mfpu=32 in that case, and do other archs have the case that only support FP32? Huacai > + > ifdef CONFIG_DYNAMIC_FTRACE > KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY > CC_FLAGS_FTRACE := -fpatchable-function-entry=2 > @@ -46,7 +49,7 @@ ld-emul = $(64bit-emul) > cflags-y += -mabi=lp64s > endif > > -cflags-y += -pipe -msoft-float > +cflags-y += -pipe $(CC_FLAGS_NO_FPU) > LDFLAGS_vmlinux += -static -n -nostdlib > > # When the assembler supports explicit relocation hint, we must use it. > diff --git a/arch/loongarch/include/asm/fpu.h b/arch/loongarch/include/asm/fpu.h > index c2d8962fda00..3177674228f8 100644 > --- a/arch/loongarch/include/asm/fpu.h > +++ b/arch/loongarch/include/asm/fpu.h > @@ -21,6 +21,7 @@ > > struct sigcontext; > > +#define kernel_fpu_available() cpu_has_fpu > extern void kernel_fpu_begin(void); > extern void kernel_fpu_end(void); > > -- > 2.42.0 > >
