linux-kernel - [PATCH] x86: crypto: fix building crc32c with clang ias

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Date:   Wed, 27 May 2020 16:17:40 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, Tim Chen <tim.c.chen@...ux.intel.com>
Cc:     Arnd Bergmann <arnd@...db.de>, "H. Peter Anvin" <hpa@...or.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Jiri Slaby <jslaby@...e.cz>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: [PATCH] x86: crypto: fix building crc32c with clang ias

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 <arnd@...db.de>
---
 arch/x86/crypto/crc32c-pcl-intel-asm_64.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/crypto/crc32c-pcl-intel-asm_64.S b/arch/x86/crypto/crc32c-pcl-intel-asm_64.S
index 8501ec4532f4..442599cbe796 100644
--- 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
 	JMP_NOSPEC bufp
-- 
2.26.2