[PATCH] MIPS: crypto: Fix CRC32 code

[PATCH] MIPS: crypto: Fix CRC32 code

[Paul Cercueil]

Commit 67512a8cf5a7 ("MIPS: Avoid macro redefinitions") changed how the
MIPS register macros were defined, in order to allow the code to compile
under LLVM/Clang.

The MIPS CRC32 code however wasn't updated accordingly, causing a build
bug when using a MIPS32r6 toolchain without CRC support.

Update the CRC32 code to use the macros correctly, to fix the build
failures.

Fixes: 67512a8cf5a7 ("MIPS: Avoid macro redefinitions")
Cc: <stable@vger.kernel.org>
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Reported-by: kernel test robot <lkp@intel.com>
---
 arch/mips/crypto/crc32-mips.c | 46 ++++++++++++++++++++---------------
 1 file changed, 26 insertions(+), 20 deletions(-)

diff --git a/arch/mips/crypto/crc32-mips.c b/arch/mips/crypto/crc32-mips.c
index 0a03529cf317..3e4f5ba104f8 100644
--- a/arch/mips/crypto/crc32-mips.c
+++ b/arch/mips/crypto/crc32-mips.c
@@ -28,7 +28,7 @@ enum crc_type {
 };
 
 #ifndef TOOLCHAIN_SUPPORTS_CRC
-#define _ASM_MACRO_CRC32(OP, SZ, TYPE)					  \
+#define _ASM_SET_CRC(OP, SZ, TYPE)					  \
 _ASM_MACRO_3R(OP, rt, rs, rt2,						  \
 	".ifnc	\\rt, \\rt2\n\t"					  \
 	".error	\"invalid operands \\\"" #OP " \\rt,\\rs,\\rt2\\\"\"\n\t" \
@@ -37,30 +37,36 @@ _ASM_MACRO_3R(OP, rt, rs, rt2,						  \
 			  ((SZ) <<  6) | ((TYPE) << 8))			  \
 	_ASM_INSN32_IF_MM(0x00000030 | (__rs << 16) | (__rt << 21) |	  \
 			  ((SZ) << 14) | ((TYPE) << 3)))
-_ASM_MACRO_CRC32(crc32b,  0, 0);
-_ASM_MACRO_CRC32(crc32h,  1, 0);
-_ASM_MACRO_CRC32(crc32w,  2, 0);
-_ASM_MACRO_CRC32(crc32d,  3, 0);
-_ASM_MACRO_CRC32(crc32cb, 0, 1);
-_ASM_MACRO_CRC32(crc32ch, 1, 1);
-_ASM_MACRO_CRC32(crc32cw, 2, 1);
-_ASM_MACRO_CRC32(crc32cd, 3, 1);
-#define _ASM_SET_CRC ""
+#define _ASM_UNSET_CRC(op, SZ, TYPE) ".purgem " #op "\n\t"
 #else /* !TOOLCHAIN_SUPPORTS_CRC */
-#define _ASM_SET_CRC ".set\tcrc\n\t"
+#define _ASM_SET_CRC(op, SZ, TYPE) ".set\tcrc\n\t"
+#define _ASM_UNSET_CRC(op, SZ, TYPE)
 #endif
 
-#define _CRC32(crc, value, size, type)		\
-do {						\
-	__asm__ __volatile__(			\
-		".set	push\n\t"		\
-		_ASM_SET_CRC			\
-		#type #size "	%0, %1, %0\n\t"	\
-		".set	pop"			\
-		: "+r" (crc)			\
-		: "r" (value));			\
+#define __CRC32(crc, value, op, SZ, TYPE)		\
+do {							\
+	__asm__ __volatile__(				\
+		".set	push\n\t"			\
+		_ASM_SET_CRC(op, SZ, TYPE)		\
+		#op "	%0, %1, %0\n\t"			\
+		_ASM_UNSET_CRC(op, SZ, TYPE)		\
+		".set	pop"				\
+		: "+r" (crc)				\
+		: "r" (value));				\
 } while (0)
 
+#define _CRC32_crc32b(crc, value)	__CRC32(crc, value, crc32b, 0, 0)
+#define _CRC32_crc32h(crc, value)	__CRC32(crc, value, crc32h, 1, 0)
+#define _CRC32_crc32w(crc, value)	__CRC32(crc, value, crc32w, 2, 0)
+#define _CRC32_crc32d(crc, value)	__CRC32(crc, value, crc32d, 3, 0)
+#define _CRC32_crc32cb(crc, value)	__CRC32(crc, value, crc32cb, 0, 1)
+#define _CRC32_crc32ch(crc, value)	__CRC32(crc, value, crc32ch, 1, 1)
+#define _CRC32_crc32cw(crc, value)	__CRC32(crc, value, crc32cw, 2, 1)
+#define _CRC32_crc32cd(crc, value)	__CRC32(crc, value, crc32cd, 3, 1)
+
+#define _CRC32(crc, value, size, op) \
+	_CRC32_##op##size(crc, value)
+
 #define CRC32(crc, value, size) \
 	_CRC32(crc, value, size, crc32)
 
-- 
2.35.1

Re: [PATCH] MIPS: crypto: Fix CRC32 code

[Thomas Bogendoerfer]

On Thu, Mar 31, 2022 at 05:42:00PM +0100, Paul Cercueil wrote:
> Commit 67512a8cf5a7 ("MIPS: Avoid macro redefinitions") changed how the
> MIPS register macros were defined, in order to allow the code to compile
> under LLVM/Clang.
> 
> The MIPS CRC32 code however wasn't updated accordingly, causing a build
> bug when using a MIPS32r6 toolchain without CRC support.
> 
> Update the CRC32 code to use the macros correctly, to fix the build
> failures.
> 
> Fixes: 67512a8cf5a7 ("MIPS: Avoid macro redefinitions")
> Cc: <stable@vger.kernel.org>
> Signed-off-by: Paul Cercueil <paul@crapouillou.net>
> Reported-by: kernel test robot <lkp@intel.com>
> ---
>  arch/mips/crypto/crc32-mips.c | 46 ++++++++++++++++++++---------------
>  1 file changed, 26 insertions(+), 20 deletions(-)

applied to mips-next.

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]