[PATCH 08/13] lib/crc/mips: migrate mips-optimized CRC code into lib/crc/

[Eric Biggers <ebiggers@kernel.org>]

From: Eric Biggers <ebiggers@google.com>

Move the mips-optimized CRC code from arch/mips/lib/crc* into its new
location in lib/crc/mips/, 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/mips/Kconfig                             |  1 -
 arch/mips/lib/Makefile                        |  2 --
 lib/crc/Kconfig                               |  1 +
 .../lib/crc32-mips.c => lib/crc/mips/crc32.h  | 35 ++++---------------
 4 files changed, 8 insertions(+), 31 deletions(-)
 rename arch/mips/lib/crc32-mips.c => lib/crc/mips/crc32.h (82%)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index fc0772c1bad4a..31d6975674fd6 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1995,11 +1995,10 @@ config CPU_MIPSR5
 	select MIPS_SPRAM
 
 config CPU_MIPSR6
 	bool
 	default y if CPU_MIPS32_R6 || CPU_MIPS64_R6
-	select ARCH_HAS_CRC32
 	select CPU_HAS_RIXI
 	select CPU_HAS_DIEI if !CPU_DIEI_BROKEN
 	select HAVE_ARCH_BITREVERSE
 	select MIPS_ASID_BITS_VARIABLE
 	select MIPS_SPRAM
diff --git a/arch/mips/lib/Makefile b/arch/mips/lib/Makefile
index 9d75845ef78e1..8c40ffb09c420 100644
--- a/arch/mips/lib/Makefile
+++ b/arch/mips/lib/Makefile
@@ -14,9 +14,7 @@ obj-$(CONFIG_PCI)	+= iomap-pci.o
 lib-$(CONFIG_GENERIC_CSUM)	:= $(filter-out csum_partial.o, $(lib-y))
 
 obj-$(CONFIG_CPU_GENERIC_DUMP_TLB) += dump_tlb.o
 obj-$(CONFIG_CPU_R3000)		+= r3k_dump_tlb.o
 
-obj-$(CONFIG_CRC32_ARCH)	+= crc32-mips.o
-
 # libgcc-style stuff needed in the kernel
 obj-y += bswapsi.o bswapdi.o multi3.o
diff --git a/lib/crc/Kconfig b/lib/crc/Kconfig
index ee320ae19ca85..2d99aab4f838d 100644
--- a/lib/crc/Kconfig
+++ b/lib/crc/Kconfig
@@ -64,10 +64,11 @@ config CRC32_ARCH
 	bool
 	depends on CRC32 && CRC_OPTIMIZATIONS
 	default y if ARM && KERNEL_MODE_NEON
 	default y if ARM64
 	default y if LOONGARCH
+	default y if MIPS && CPU_MIPSR6
 
 config CRC64
 	tristate
 	help
 	  The CRC64 library functions.  Select this if your module uses any of
diff --git a/arch/mips/lib/crc32-mips.c b/lib/crc/mips/crc32.h
similarity index 82%
rename from arch/mips/lib/crc32-mips.c
rename to lib/crc/mips/crc32.h
index 45e4d2c9fbf54..aa7f3228b7db3 100644
--- a/arch/mips/lib/crc32-mips.c
+++ b/lib/crc/mips/crc32.h
@@ -7,14 +7,10 @@
  * Copyright (C) 2014 Linaro Ltd <yazen.ghannam@linaro.org>
  * Copyright (C) 2018 MIPS Tech, LLC
  */
 
 #include <linux/cpufeature.h>
-#include <linux/crc32.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
 #include <asm/mipsregs.h>
 #include <linux/unaligned.h>
 
 #ifndef TOOLCHAIN_SUPPORTS_CRC
 #define _ASM_SET_CRC(OP, SZ, TYPE)					  \
@@ -62,11 +58,12 @@ do {							\
 #define CRC32C(crc, value, size) \
 	_CRC32(crc, value, size, crc32c)
 
 static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_crc32);
 
-u32 crc32_le_arch(u32 crc, const u8 *p, size_t len)
+#define crc32_le_arch crc32_le_arch
+static inline u32 crc32_le_arch(u32 crc, const u8 *p, size_t len)
 {
 	if (!static_branch_likely(&have_crc32))
 		return crc32_le_base(crc, p, len);
 
 	if (IS_ENABLED(CONFIG_64BIT)) {
@@ -104,13 +101,13 @@ u32 crc32_le_arch(u32 crc, const u8 *p, size_t len)
 		CRC32(crc, value, b);
 	}
 
 	return crc;
 }
-EXPORT_SYMBOL(crc32_le_arch);
 
-u32 crc32c_arch(u32 crc, const u8 *p, size_t len)
+#define crc32c_arch crc32c_arch
+static inline u32 crc32c_arch(u32 crc, const u8 *p, size_t len)
 {
 	if (!static_branch_likely(&have_crc32))
 		return crc32c_base(crc, p, len);
 
 	if (IS_ENABLED(CONFIG_64BIT)) {
@@ -147,37 +144,19 @@ u32 crc32c_arch(u32 crc, const u8 *p, size_t len)
 
 		CRC32C(crc, value, b);
 	}
 	return crc;
 }
-EXPORT_SYMBOL(crc32c_arch);
 
-u32 crc32_be_arch(u32 crc, const u8 *p, size_t len)
-{
-	return crc32_be_base(crc, p, len);
-}
-EXPORT_SYMBOL(crc32_be_arch);
-
-static int __init crc32_mips_init(void)
+#define crc32_mod_init_arch crc32_mod_init_arch
+static inline void crc32_mod_init_arch(void)
 {
 	if (cpu_have_feature(cpu_feature(MIPS_CRC32)))
 		static_branch_enable(&have_crc32);
-	return 0;
 }
-subsys_initcall(crc32_mips_init);
 
-static void __exit crc32_mips_exit(void)
-{
-}
-module_exit(crc32_mips_exit);
-
-u32 crc32_optimizations(void)
+static inline u32 crc32_optimizations_arch(void)
 {
 	if (static_key_enabled(&have_crc32))
 		return CRC32_LE_OPTIMIZATION | CRC32C_OPTIMIZATION;
 	return 0;
 }
-EXPORT_SYMBOL(crc32_optimizations);
-
-MODULE_AUTHOR("Marcin Nowakowski <marcin.nowakowski@mips.com");
-MODULE_DESCRIPTION("CRC32 and CRC32C using optional MIPS instructions");
-MODULE_LICENSE("GPL v2");
-- 
2.49.0