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Date:   Sat, 31 Oct 2020 12:35:42 +0100
From:   Greg Kroah-Hartman <>
Cc:     Greg Kroah-Hartman <>,, Arnd Bergmann <>,
        Nathan Chancellor <>,
        Herbert Xu <>,
        Jian Cai <>
Subject: [PATCH 5.4 46/49] crypto: x86/crc32c - fix building with clang ias

From: Arnd Bergmann <>

commit 44623b2818f4a442726639572f44fd9b6d0ef68c upstream.

The clang integrated assembler complains about movzxw:

arch/x86/crypto/crc32c-pcl-intel-asm_64.S:173:2: error: invalid instruction mnemonic 'movzxw'

It seems that movzwq is the mnemonic that it expects instead,
and this is what objdump prints when disassembling the file.

Fixes: 6a8ce1ef3940 ("crypto: crc32c - Optimize CRC32C calculation with PCLMULQDQ instruction")
Signed-off-by: Arnd Bergmann <>
Reviewed-by: Nathan Chancellor <>
Signed-off-by: Herbert Xu <>
[jc: Fixed conflicts due to lack of 34fdce6981b9 ("x86: Change {JMP,CALL}_NOSPEC argument")]
Signed-off-by: Jian Cai <>
Signed-off-by: Greg Kroah-Hartman <>

 arch/x86/crypto/crc32c-pcl-intel-asm_64.S |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/crypto/crc32c-pcl-intel-asm_64.S
+++ b/arch/x86/crypto/crc32c-pcl-intel-asm_64.S
@@ -170,7 +170,7 @@ continue_block:
 	## branch into array
 	lea	jump_table(%rip), bufp
-	movzxw  (bufp, %rax, 2), len
+	movzwq  (bufp, %rax, 2), len
 	lea	crc_array(%rip), bufp
 	lea     (bufp, len, 1), bufp

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