[PATCH v2 07/14] LoongArch: Implement ARCH_HAS_KERNEL_FPU_SUPPORT
Huacai Chen
chenhuacai at kernel.org
Thu Jan 4 01:55:32 PST 2024
Hi, Samuel,
On Thu, Dec 28, 2023 at 9:42 AM Samuel Holland
<samuel.holland at sifive.com> 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 at xen0n.name>
> Reviewed-by: Christoph Hellwig <hch at lst.de>
> Signed-off-by: Samuel Holland <samuel.holland at sifive.com>
> ---
>
> (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
>
>
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