From: Samuel Holland <samuel.holland@sifive.com>
To: linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev,
linuxppc-dev@lists.ozlabs.org, x86@kernel.org,
linux-riscv@lists.infradead.org,
Christoph Hellwig <hch@infradead.org>
Cc: linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org,
linux-arch@vger.kernel.org,
Samuel Holland <samuel.holland@sifive.com>
Subject: [RFC PATCH 06/12] LoongArch: Implement ARCH_HAS_KERNEL_FPU_SUPPORT
Date: Thu, 7 Dec 2023 21:54:36 -0800 [thread overview]
Message-ID: <20231208055501.2916202-7-samuel.holland@sifive.com> (raw)
In-Reply-To: <20231208055501.2916202-1-samuel.holland@sifive.com>
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.
Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
---
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 204b94b2e6aa..f5c4f7e921db 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
next prev parent reply other threads:[~2023-12-08 5:55 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-08 5:54 [RFC PATCH 00/12] Unified cross-architecture kernel-mode FPU API Samuel Holland
2023-12-08 5:54 ` [RFC PATCH 01/12] arch: Add ARCH_HAS_KERNEL_FPU_SUPPORT Samuel Holland
2023-12-11 16:02 ` Christoph Hellwig
2023-12-08 5:54 ` [RFC PATCH 02/12] ARM: Implement ARCH_HAS_KERNEL_FPU_SUPPORT Samuel Holland
2023-12-11 16:04 ` Christoph Hellwig
2023-12-08 5:54 ` [RFC PATCH 03/12] ARM: crypto: Use CC_FLAGS_FPU for NEON CFLAGS Samuel Holland
2023-12-11 16:04 ` Christoph Hellwig
2023-12-08 5:54 ` [RFC PATCH 04/12] arm64: Implement ARCH_HAS_KERNEL_FPU_SUPPORT Samuel Holland
2023-12-11 16:05 ` Christoph Hellwig
2023-12-13 16:19 ` Will Deacon
2023-12-08 5:54 ` [RFC PATCH 05/12] lib/raid6: Use CC_FLAGS_FPU for NEON CFLAGS Samuel Holland
2023-12-11 16:07 ` Christoph Hellwig
2023-12-11 16:12 ` Samuel Holland
2023-12-12 7:11 ` Christoph Hellwig
2023-12-08 5:54 ` Samuel Holland [this message]
2023-12-11 16:07 ` [RFC PATCH 06/12] LoongArch: Implement ARCH_HAS_KERNEL_FPU_SUPPORT Christoph Hellwig
2023-12-13 16:13 ` WANG Xuerui
2023-12-08 5:54 ` [RFC PATCH 07/12] powerpc: " Samuel Holland
2023-12-11 16:08 ` Christoph Hellwig
2023-12-08 5:54 ` [RFC PATCH 08/12] x86: " Samuel Holland
2023-12-11 16:08 ` Christoph Hellwig
2023-12-08 5:54 ` [RFC PATCH 09/12] riscv: Add support for kernel-mode FPU Samuel Holland
2023-12-11 16:11 ` Christoph Hellwig
2023-12-11 16:16 ` Samuel Holland
2023-12-08 5:54 ` [RFC PATCH 10/12] drm/amd/display: Use ARCH_HAS_KERNEL_FPU_SUPPORT Samuel Holland
2023-12-11 12:23 ` Michael Ellerman
2023-12-14 1:03 ` Samuel Holland
2023-12-14 3:13 ` Timothy Pearson
2023-12-14 4:45 ` Michael Ellerman
2023-12-08 5:54 ` [RFC PATCH 11/12] selftests/fpu: Move FP code to a separate translation unit Samuel Holland
2023-12-11 16:18 ` Christoph Hellwig
2023-12-08 5:54 ` [RFC PATCH 12/12] selftests/fpu: Allow building on other architectures Samuel Holland
2023-12-11 16:19 ` Christoph Hellwig
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