Commit 372f6623 authored by Samuel Holland's avatar Samuel Holland Committed by Andrew Morton
Browse files

LoongArch: implement ARCH_HAS_KERNEL_FPU_SUPPORT 

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.

Link: https://lkml.kernel.org/r/20240329072441.591471-8-samuel.holland@sifive.com


Signed-off-by: default avatarSamuel Holland <samuel.holland@sifive.com>
Acked-by: default avatarWANG Xuerui <git@xen0n.name>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Acked-by: default avatarChristian König <christian.koenig@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Borislav Petkov (AMD) <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nicolas Schier <nicolas@fjasle.eu>
Cc: Palmer Dabbelt <palmer@rivosinc.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 4be07393

arch/loongarch/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ config LOONGARCH 
	select ARCH_HAS_CURRENT_STACK_POINTER

	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

arch/loongarch/Makefile

+4 −1
Original line number Diff line number Diff line
@@ -26,6 +26,9 @@ endif 
32bit-emul		= elf32loongarch

64bit-emul		= elf64loongarch



CC_FLAGS_FPU		:= -mfpu=64

CC_FLAGS_NO_FPU		:= -msoft-float



ifdef CONFIG_UNWINDER_ORC

orc_hash_h := arch/$(SRCARCH)/include/generated/asm/orc_hash.h

orc_hash_sh := $(srctree)/scripts/orc_hash.sh
@@ -59,7 +62,7 @@ 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.

arch/loongarch/include/asm/fpu.h

+1 −0
Original line number Diff line number Diff line
@@ -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);