linux-kernel - [PATCH v2 07/14] LoongArch: Implement ARCH_HAS_KERNEL_FPU

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Message-ID: <20231228014220.3562640-8-samuel.holland@sifive.com>
Date: Wed, 27 Dec 2023 17:41:57 -0800
From: Samuel Holland <samuel.holland@...ive.com>
To: linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org,
	x86@...nel.org,
	linux-riscv@...ts.infradead.org,
	Christoph Hellwig <hch@....de>
Cc: loongarch@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	amd-gfx@...ts.freedesktop.org,
	linux-arch@...r.kernel.org,
	Samuel Holland <samuel.holland@...ive.com>,
	WANG Xuerui <git@...0n.name>
Subject: [PATCH v2 07/14] 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.

Acked-by: WANG Xuerui <git@...0n.name>
Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: Samuel Holland <samuel.holland@...ive.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
+
 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