From patchwork Fri Jun 28 08:41:17 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: WangYuli X-Patchwork-Id: 13715714 Received: from smtpbgau2.qq.com (smtpbgau2.qq.com [54.206.34.216]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 04B1C43AC0; Fri, 28 Jun 2024 08:43:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=54.206.34.216 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719564193; cv=none; b=jH+HsuMAgEpxKhQKoR9x5Pd3eGWWkE0G/rA4BUjI5ev8JdB+LF9rqno0BvZAcHZeNc1AEZodM7gun04tuugCwNapEytiPR74twUhTlibVAjoVOxMeSLWdTtbU7btHtY8Hyxnfj4bDG0oULNv+p+f8M0wpLGPUNTeA1h+jFdYJUs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719564193; c=relaxed/simple; bh=VPCR6B+q/ze+0k8/a5//nsllEdjBibCOi2hB+YOPY7M=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=YliSfFXdC60gYXBb4QZQcU8gKMJZzBcPg4maYizAyi532XNae7QSRG7uY/PCbBzX77b4Exp8kmeWrynPB4PqZdsEYlnw++QUuDDOSkpY0Vl+wLhM0y5ogzKug6HtSQ5pyK5nhAQEBi4bdslSiT7wdZowI8I7xlzSQNuSnZsGf2c= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=uniontech.com; spf=pass smtp.mailfrom=uniontech.com; arc=none smtp.client-ip=54.206.34.216 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=uniontech.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=uniontech.com X-QQ-mid: bizesmtpsz9t1719564106tkrjopl X-QQ-Originating-IP: f/kOEM2Glu4JL+oCsb/LBSQoNQjNX+nOQd0jJxI2XXc= Received: from localhost.localdomain ( [113.57.152.160]) by bizesmtp.qq.com (ESMTP) with id ; Fri, 28 Jun 2024 16:41:44 +0800 (CST) X-QQ-SSF: 0000000000000000000000000000000 X-QQ-GoodBg: 1 X-BIZMAIL-ID: 2146255387032920080 From: WangYuli To: herbert@gondor.apana.org.au, davem@davemloft.net, tsbogend@alpha.franken.de Cc: linux-crypto@vger.kernel.org, linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org, WangYuli , Guan Wentao Subject: [PATCH] MIPS: crypto: Clean up useless assignment operations Date: Fri, 28 Jun 2024 16:41:17 +0800 Message-ID: <1D248893502B75F5+20240628084117.84264-1-wangyuli@uniontech.com> X-Mailer: git-send-email 2.43.4 Precedence: bulk X-Mailing-List: linux-mips@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-QQ-SENDSIZE: 520 Feedback-ID: bizesmtpsz:uniontech.com:qybglogicsvrgz:qybglogicsvrgz8a-1 When entering the "len & sizeof(u32)" branch, len must be less than 8. So after one operation, len must be less than 4. At this time, "len -= sizeof(u32)" is not necessary for 64-bit CPUs. A similar issue has been solved at Loongarch. Link: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v6.10-rc5&id=fea1c949f6ca5059e12de00d0483645debc5b206 Signed-off-by: Guan Wentao Signed-off-by: WangYuli --- arch/mips/crypto/crc32-mips.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/mips/crypto/crc32-mips.c b/arch/mips/crypto/crc32-mips.c index ec6d58008f8e..505d2d897849 100644 --- a/arch/mips/crypto/crc32-mips.c +++ b/arch/mips/crypto/crc32-mips.c @@ -94,7 +94,9 @@ static u32 crc32_mips_le_hw(u32 crc_, const u8 *p, unsigned int len) CRC32(crc, value, w); p += sizeof(u32); +#ifndef CONFIG_64BIT len -= sizeof(u32); +#endif } if (len & sizeof(u16)) { @@ -134,7 +136,9 @@ static u32 crc32c_mips_le_hw(u32 crc_, const u8 *p, unsigned int len) CRC32C(crc, value, w); p += sizeof(u32); +#ifndef CONFIG_64BIT len -= sizeof(u32); +#endif } if (len & sizeof(u16)) {