lib/crc: riscv: Migrate optimized CRC code into lib/crc/

Move the riscv-optimized CRC code from arch/riscv/lib/crc* into its new
location in lib/crc/riscv/, and wire it up in the new way.  This new way
of organizing the CRC code eliminates the need to artificially split the
code for each CRC variant into separate arch and generic modules,
enabling better inlining and dead code elimination.  For more details,
see "lib/crc: Prepare for arch-optimized code in subdirs of lib/crc/".

Reviewed-by: "Martin K. Petersen" <martin.petersen@oracle.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Acked-by: "Jason A. Donenfeld" <Jason@zx2c4.com>
Link: https://lore.kernel.org/r/20250607200454.73587-9-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

Author: Eric Biggers

arch/riscv/Kconfig

@@ -24,9 +24,6 @@ config RISCV
 	select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2
 	select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE
 	select ARCH_HAS_BINFMT_FLAT
-	select ARCH_HAS_CRC32 if RISCV_ISA_ZBC
-	select ARCH_HAS_CRC64 if 64BIT && RISCV_ISA_ZBC
-	select ARCH_HAS_CRC_T10DIF if RISCV_ISA_ZBC
 	select ARCH_HAS_CURRENT_STACK_POINTER
 	select ARCH_HAS_DEBUG_VIRTUAL if MMU
 	select ARCH_HAS_DEBUG_VM_PGTABLE

arch/riscv/lib/Makefile

@@ -16,12 +16,6 @@ endif
 lib-$(CONFIG_MMU)	+= uaccess.o
 lib-$(CONFIG_64BIT)	+= tishift.o
 lib-$(CONFIG_RISCV_ISA_ZICBOZ)	+= clear_page.o
-obj-$(CONFIG_CRC32_ARCH)	+= crc32-riscv.o
-crc32-riscv-y := crc32.o crc32_msb.o crc32_lsb.o
-obj-$(CONFIG_CRC64_ARCH) += crc64-riscv.o
-crc64-riscv-y := crc64.o crc64_msb.o crc64_lsb.o
-obj-$(CONFIG_CRC_T10DIF_ARCH)	+= crc-t10dif-riscv.o
-crc-t10dif-riscv-y := crc-t10dif.o crc16_msb.o
 obj-$(CONFIG_FUNCTION_ERROR_INJECTION) += error-inject.o
 lib-$(CONFIG_RISCV_ISA_V)	+= xor.o
 lib-$(CONFIG_RISCV_ISA_V)	+= riscv_v_helpers.o

lib/crc/Kconfig

@@ -53,6 +53,7 @@ config CRC_T10DIF_ARCH
 	default y if ARM && KERNEL_MODE_NEON
 	default y if ARM64 && KERNEL_MODE_NEON
 	default y if PPC64 && ALTIVEC
+	default y if RISCV && RISCV_ISA_ZBC
 
 config CRC32
 	tristate
@@ -72,6 +73,7 @@ config CRC32_ARCH
 	default y if LOONGARCH
 	default y if MIPS && CPU_MIPSR6
 	default y if PPC64 && ALTIVEC
+	default y if RISCV && RISCV_ISA_ZBC
 
 config CRC64
 	tristate
@@ -85,6 +87,7 @@ config ARCH_HAS_CRC64
 config CRC64_ARCH
 	bool
 	depends on CRC64 && CRC_OPTIMIZATIONS
+	default y if RISCV && RISCV_ISA_ZBC && 64BIT
 
 config CRC_OPTIMIZATIONS
 	bool "Enable optimized CRC implementations" if EXPERT

lib/crc/Makefile

@@ -16,6 +16,7 @@ CFLAGS_crc-t10dif-main.o += -I$(src)/$(SRCARCH)
 crc-t10dif-$(CONFIG_ARM) += arm/crc-t10dif-core.o
 crc-t10dif-$(CONFIG_ARM64) += arm64/crc-t10dif-core.o
 crc-t10dif-$(CONFIG_PPC) += powerpc/crct10dif-vpmsum_asm.o
+crc-t10dif-$(CONFIG_RISCV) += riscv/crc16_msb.o
 endif
 
 obj-$(CONFIG_CRC32) += crc32.o
@@ -25,12 +26,14 @@ CFLAGS_crc32-main.o += -I$(src)/$(SRCARCH)
 crc32-$(CONFIG_ARM) += arm/crc32-core.o
 crc32-$(CONFIG_ARM64) += arm64/crc32-core.o
 crc32-$(CONFIG_PPC) += powerpc/crc32c-vpmsum_asm.o
+crc32-$(CONFIG_RISCV) += riscv/crc32_lsb.o riscv/crc32_msb.o
 endif
 
 obj-$(CONFIG_CRC64) += crc64.o
 crc64-y := crc64-main.o
 ifeq ($(CONFIG_CRC64_ARCH),y)
 CFLAGS_crc64-main.o += -I$(src)/$(SRCARCH)
+crc64-$(CONFIG_RISCV) += riscv/crc64_lsb.o riscv/crc64_msb.o
 endif
 
 obj-y += tests/

arch/riscv/lib/crc-clmul-consts.h lib/crc/riscv/crc-clmul-consts.harch/riscv/lib/crc-clmul-consts.h renamed to lib/crc/riscv/crc-clmul-consts.h

@@ -7,18 +7,12 @@
 
 #include <asm/hwcap.h>
 #include <asm/alternative-macros.h>
-#include <linux/crc-t10dif.h>
-#include <linux/module.h>
 
 #include "crc-clmul.h"
 
-u16 crc_t10dif_arch(u16 crc, const u8 *p, size_t len)
+static inline u16 crc_t10dif_arch(u16 crc, const u8 *p, size_t len)
 {
 	if (riscv_has_extension_likely(RISCV_ISA_EXT_ZBC))
 		return crc16_msb_clmul(crc, p, len, &crc16_msb_0x8bb7_consts);
 	return crc_t10dif_generic(crc, p, len);
 }
-EXPORT_SYMBOL(crc_t10dif_arch);
-
-MODULE_DESCRIPTION("RISC-V optimized CRC-T10DIF function");
-MODULE_LICENSE("GPL");

arch/riscv/lib/crc-clmul-template.h lib/crc/riscv/crc-clmul-template.harch/riscv/lib/crc-clmul-template.h renamed to lib/crc/riscv/crc-clmul-template.h

@@ -7,47 +7,38 @@
 
 #include <asm/hwcap.h>
 #include <asm/alternative-macros.h>
-#include <linux/crc32.h>
-#include <linux/module.h>
 
 #include "crc-clmul.h"
 
-u32 crc32_le_arch(u32 crc, const u8 *p, size_t len)
+static inline u32 crc32_le_arch(u32 crc, const u8 *p, size_t len)
 {
 	if (riscv_has_extension_likely(RISCV_ISA_EXT_ZBC))
 		return crc32_lsb_clmul(crc, p, len,
 				       &crc32_lsb_0xedb88320_consts);
 	return crc32_le_base(crc, p, len);
 }
-EXPORT_SYMBOL(crc32_le_arch);
 
-u32 crc32_be_arch(u32 crc, const u8 *p, size_t len)
+static inline u32 crc32_be_arch(u32 crc, const u8 *p, size_t len)
 {
 	if (riscv_has_extension_likely(RISCV_ISA_EXT_ZBC))
 		return crc32_msb_clmul(crc, p, len,
 				       &crc32_msb_0x04c11db7_consts);
 	return crc32_be_base(crc, p, len);
 }
-EXPORT_SYMBOL(crc32_be_arch);
 
-u32 crc32c_arch(u32 crc, const u8 *p, size_t len)
+static inline u32 crc32c_arch(u32 crc, const u8 *p, size_t len)
 {
 	if (riscv_has_extension_likely(RISCV_ISA_EXT_ZBC))
 		return crc32_lsb_clmul(crc, p, len,
 				       &crc32_lsb_0x82f63b78_consts);
 	return crc32c_base(crc, p, len);
 }
-EXPORT_SYMBOL(crc32c_arch);
 
-u32 crc32_optimizations(void)
+static inline u32 crc32_optimizations_arch(void)
 {
 	if (riscv_has_extension_likely(RISCV_ISA_EXT_ZBC))
 		return CRC32_LE_OPTIMIZATION |
 		       CRC32_BE_OPTIMIZATION |
 		       CRC32C_OPTIMIZATION;
 	return 0;
 }
-EXPORT_SYMBOL(crc32_optimizations);
-
-MODULE_DESCRIPTION("RISC-V optimized CRC32 functions");
-MODULE_LICENSE("GPL");