[PATCH 11/13] lib/crc/s390: migrate s390-optimized CRC code into lib/s390/

Eric Biggers
2025-06-01T22:45:59Z

Move the s390-optimized CRC code from arch/s390/lib/crc* into its new
location in lib/crc/s390/, and wire it up in the new way. For a
detailed explanation of why this change is being made, see the commit
that introduced the new way of integrating arch-specific code into
lib/crc/.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
arch/s390/Kconfig | 1 -
arch/s390/lib/Makefile | 3 ---
lib/crc/Kconfig | 1 +
lib/crc/Makefile | 1 +
{arch/s390/lib => lib/crc/s390}/crc32-vx.h | 0
arch/s390/lib/crc32.c => lib/crc/s390/crc32.h | 19 ++++++-------------
{arch/s390/lib => lib/crc/s390}/crc32be-vx.c | 0
{arch/s390/lib => lib/crc/s390}/crc32le-vx.c | 0
8 files changed, 8 insertions(+), 17 deletions(-)
rename {arch/s390/lib => lib/crc/s390}/crc32-vx.h (100%)
rename arch/s390/lib/crc32.c => lib/crc/s390/crc32.h (81%)
rename {arch/s390/lib => lib/crc/s390}/crc32be-vx.c (100%)
rename {arch/s390/lib => lib/crc/s390}/crc32le-vx.c (100%)

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 0c16dc443e2f6..22b90f6aa1a09 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -73,11 +73,10 @@ config S390
select ARCH_CORRECT_STACKTRACE_ON_KRETPROBE
select ARCH_ENABLE_MEMORY_HOTPLUG if SPARSEMEM
select ARCH_ENABLE_MEMORY_HOTREMOVE
select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2
select ARCH_HAS_CPU_FINALIZE_INIT
- select ARCH_HAS_CRC32
select ARCH_HAS_CURRENT_STACK_POINTER
select ARCH_HAS_DEBUG_VIRTUAL
select ARCH_HAS_DEBUG_VM_PGTABLE
select ARCH_HAS_DEBUG_WX
select ARCH_HAS_DEVMEM_IS_ALLOWED
diff --git a/arch/s390/lib/Makefile b/arch/s390/lib/Makefile
index cd35cdbfa8713..7c8583d46eca1 100644
--- a/arch/s390/lib/Makefile
+++ b/arch/s390/lib/Makefile
@@ -23,8 +23,5 @@ obj-$(CONFIG_S390_MODULES_SANITY_TEST) += test_modules.o
obj-$(CONFIG_S390_MODULES_SANITY_TEST_HELPERS) += test_modules_helpers.o

lib-$(CONFIG_FUNCTION_ERROR_INJECTION) += error-inject.o

obj-$(CONFIG_EXPOLINE_EXTERN) += expoline.o
-
-obj-$(CONFIG_CRC32_ARCH) += crc32-s390.o
-crc32-s390-y := crc32.o crc32le-vx.o crc32be-vx.o
diff --git a/lib/crc/Kconfig b/lib/crc/Kconfig
index 4044e08cb9739..1ed6e11bef909 100644
--- a/lib/crc/Kconfig
+++ b/lib/crc/Kconfig
@@ -69,10 +69,11 @@ config CRC32_ARCH
default y if ARM64
default y if LOONGARCH
default y if MIPS && CPU_MIPSR6
default y if PPC64 && ALTIVEC
default y if RISCV && RISCV_ISA_ZBC
+ default y if S390

config CRC64
tristate
help
The CRC64 library functions. Select this if your module uses any of
diff --git a/lib/crc/Makefile b/lib/crc/Makefile
index e46b35a2ffc04..1b83262b6987f 100644
--- a/lib/crc/Makefile
+++ b/lib/crc/Makefile
@@ -25,10 +25,11 @@ crc32-y := crc32-main.o
ifeq ($(CONFIG_CRC32_ARCH),y)
crc32-$(CONFIG_ARM) += arm/crc32-core.o
crc32-$(CONFIG_ARM64) += arm64/crc32-core.o
crc32-$(CONFIG_PPC) += powerpc/crc32c-vpmsum_asm.o
crc32-$(CONFIG_RISCV) += riscv/crc32_lsb.o riscv/crc32_msb.o
+crc32-$(CONFIG_S390) += s390/crc32le-vx.o s390/crc32be-vx.o
endif

obj-$(CONFIG_CRC64) += crc64.o
crc64-y := crc64-main.o
ifeq ($(CONFIG_CRC64_ARCH),y)
diff --git a/arch/s390/lib/crc32-vx.h b/lib/crc/s390/crc32-vx.h
similarity index 100%
rename from arch/s390/lib/crc32-vx.h
rename to lib/crc/s390/crc32-vx.h
diff --git a/arch/s390/lib/crc32.c b/lib/crc/s390/crc32.h
similarity index 81%
rename from arch/s390/lib/crc32.c
rename to lib/crc/s390/crc32.h
index 3c4b344417c11..8dbb07b9ea64c 100644
--- a/arch/s390/lib/crc32.c
+++ b/lib/crc/s390/crc32.h
@@ -3,16 +3,12 @@
* CRC-32 implemented with the z/Architecture Vector Extension Facility.
*
* Copyright IBM Corp. 2015
* Author(s): Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
*/
-#define KMSG_COMPONENT "crc32-vx"
-#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

-#include <linux/module.h>
#include <linux/cpufeature.h>
-#include <linux/crc32.h>
#include <asm/fpu.h>
#include "crc32-vx.h"

#define VX_MIN_LEN 64
#define VX_ALIGNMENT 16L
@@ -25,11 +21,11 @@
* on the message buffer, the hardware-accelerated or software implementation
* is used. Note that the message buffer is aligned to improve fetch
* operations of VECTOR LOAD MULTIPLE instructions.
*/
#define DEFINE_CRC32_VX(___fname, ___crc32_vx, ___crc32_sw) \
- u32 ___fname(u32 crc, const u8 *data, size_t datalen) \
+ static inline u32 ___fname(u32 crc, const u8 *data, size_t datalen) \
{ \
unsigned long prealign, aligned, remaining; \
DECLARE_KERNEL_FPU_ONSTACK16(vxstate); \
\
if (datalen < VX_MIN_LEN + VX_ALIGN_MASK || !cpu_has_vx()) \
@@ -52,26 +48,23 @@
\
if (remaining) \
crc = ___crc32_sw(crc, data + aligned, remaining); \
\
return crc; \
- } \
- EXPORT_SYMBOL(___fname);
+ }

+#define crc32_le_arch crc32_le_arch
+#define crc32_be_arch crc32_be_arch
+#define crc32c_arch crc32c_arch
DEFINE_CRC32_VX(crc32_le_arch, crc32_le_vgfm_16, crc32_le_base)
DEFINE_CRC32_VX(crc32_be_arch, crc32_be_vgfm_16, crc32_be_base)
DEFINE_CRC32_VX(crc32c_arch, crc32c_le_vgfm_16, crc32c_base)

-u32 crc32_optimizations(void)
+static inline u32 crc32_optimizations_arch(void)
{
if (cpu_has_vx()) {
return CRC32_LE_OPTIMIZATION |
CRC32_BE_OPTIMIZATION |
CRC32C_OPTIMIZATION;
}
return 0;
}
-EXPORT_SYMBOL(crc32_optimizations);
-
-MODULE_AUTHOR("Hendrik Brueckner <brueckner@linux.vnet.ibm.com>");
-MODULE_DESCRIPTION("CRC-32 algorithms using z/Architecture Vector Extension Facility");
-MODULE_LICENSE("GPL");
diff --git a/arch/s390/lib/crc32be-vx.c b/lib/crc/s390/crc32be-vx.c
similarity index 100%
rename from arch/s390/lib/crc32be-vx.c
rename to lib/crc/s390/crc32be-vx.c
diff --git a/arch/s390/lib/crc32le-vx.c b/lib/crc/s390/crc32le-vx.c
similarity index 100%
rename from arch/s390/lib/crc32le-vx.c
rename to lib/crc/s390/crc32le-vx.c
--
2.49.0