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From: Samuel Holland <samuel.holland@sifive.com>
To: Andrew Morton <akpm@linux-foundation.org>,
	linux-arm-kernel@lists.infradead.org, x86@kernel.org
Cc: linux-arch@vger.kernel.org, Huacai Chen <chenhuacai@kernel.org>,
	linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org,
	Samuel Holland <samuel.holland@sifive.com>,
	loongarch@lists.linux.dev, WANG Xuerui <git@xen0n.name>,
	linux-riscv@lists.infradead.org, linuxppc-dev@lists.ozlabs.org,
	Christoph Hellwig <hch@lst.de>
Subject: [PATCH v3 07/14] LoongArch: Implement ARCH_HAS_KERNEL_FPU_SUPPORT
Date: Wed, 27 Mar 2024 13:00:38 -0700	[thread overview]
Message-ID: <20240327200157.1097089-8-samuel.holland@sifive.com> (raw)
In-Reply-To: <20240327200157.1097089-1-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.

Acked-by: WANG Xuerui <git@xen0n.name>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
---

Changes in v3:
 - Rebase on v6.9-rc1

 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 a5f300ec6f28..2266c6c41c38 100644
--- a/arch/loongarch/Kconfig
+++ b/arch/loongarch/Kconfig
@@ -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
diff --git a/arch/loongarch/Makefile b/arch/loongarch/Makefile
index df6caf79537a..efb5440a43ec 100644
--- a/arch/loongarch/Makefile
+++ b/arch/loongarch/Makefile
@@ -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.
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);
 
-- 
2.43.1


  parent reply	other threads:[~2024-03-27 20:07 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-03-27 20:00 [PATCH v3 00/14] Unified cross-architecture kernel-mode FPU API Samuel Holland
2024-03-27 20:00 ` [PATCH v3 01/14] arch: Add ARCH_HAS_KERNEL_FPU_SUPPORT Samuel Holland
2024-03-27 20:00 ` [PATCH v3 02/14] ARM: Implement ARCH_HAS_KERNEL_FPU_SUPPORT Samuel Holland
2024-03-27 20:00 ` [PATCH v3 03/14] ARM: crypto: Use CC_FLAGS_FPU for NEON CFLAGS Samuel Holland
2024-03-27 20:00 ` [PATCH v3 04/14] arm64: Implement ARCH_HAS_KERNEL_FPU_SUPPORT Samuel Holland
2024-03-27 20:00 ` [PATCH v3 05/14] arm64: crypto: Use CC_FLAGS_FPU for NEON CFLAGS Samuel Holland
2024-03-27 20:00 ` [PATCH v3 06/14] lib/raid6: " Samuel Holland
2024-03-27 20:00 ` Samuel Holland [this message]
2024-03-27 20:00 ` [PATCH v3 08/14] powerpc: Implement ARCH_HAS_KERNEL_FPU_SUPPORT Samuel Holland
2024-03-27 20:00 ` [PATCH v3 09/14] x86: " Samuel Holland
2024-03-27 20:00 ` [PATCH v3 10/14] riscv: Add support for kernel-mode FPU Samuel Holland
2024-03-27 20:00 ` [PATCH v3 11/14] drm/amd/display: Only use hard-float, not altivec on powerpc Samuel Holland
2024-03-27 20:00 ` [PATCH v3 12/14] drm/amd/display: Use ARCH_HAS_KERNEL_FPU_SUPPORT Samuel Holland
2024-03-27 21:25   ` Andrew Morton
2024-03-27 22:08     ` Samuel Holland
2024-03-27 20:00 ` [PATCH v3 13/14] selftests/fpu: Move FP code to a separate translation unit Samuel Holland
2024-03-27 20:00 ` [PATCH v3 14/14] selftests/fpu: Allow building on other architectures Samuel Holland

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