From nobody Sat Nov 30 21:38:55 2024 Received: from smtpbguseast1.qq.com (smtpbguseast1.qq.com [54.204.34.129]) (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 D21F738DE0; Fri, 6 Sep 2024 03:47:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=54.204.34.129 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725594428; cv=none; b=kFsEBNW94Qv5d7g9hA72mIk9KRFsjBYZBtVBgjl7/wqiQo0w67tY2HOc9X0HlTQocCYtdA6ufKClWVQSTbJ+asYgzSk4AkuBGJu8rz/bg5EouwPDTB/maJsYWpvWINwziNmggxGk/Qb8qRlWROJ7RZJMF1TDc6PeGktNIavJJfE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725594428; c=relaxed/simple; bh=gvY8AH4a88MP1lz2m4OgJjyz6KDbapZwsTzDMYuixg4=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=Y4GdmUNcsb088/Jh1HeBQm2FWdl9N4d8P9DPLY6i1HJ+1yJNzTWGFePtj6Gl8CFYsJQmnm7fk8EI3oY9lzpYHTZFq0Ubwi8CCVRGUfeDXJHW4GD+IRXZQSoxPZq6JV1KvKPc0cYi1kWhzA3E6P6ePf3yIBoqrfIBmf4SqsAGgSY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=uniontech.com; spf=pass smtp.mailfrom=uniontech.com; dkim=pass (1024-bit key) header.d=uniontech.com header.i=@uniontech.com header.b=g4scRZWa; arc=none smtp.client-ip=54.204.34.129 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=uniontech.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=uniontech.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=uniontech.com header.i=@uniontech.com header.b="g4scRZWa" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=uniontech.com; s=onoh2408; t=1725594380; bh=BHo9Isz2T8wnA4FQQqg3YttItu9Af8Lpgwwo2oZ48CY=; h=From:To:Subject:Date:Message-ID:MIME-Version; b=g4scRZWawW7IHe+xqpM2KulTnkm2i6wNfOONB8yF/RRu+hB5EpNcQE61RKRzOT/Ta 6U4aZpzfsQ79BkUnFAgwHA1erZE/MptI5PgJCEntC09KH3VLyMdpGcSp6hn6tzn4CG Hl0We5VnzWnMExj165JhpxEG5tJFxD6RaVnfxpbg= X-QQ-mid: bizesmtp90t1725594372tauikl58 X-QQ-Originating-IP: +xTdcMwz1y4V1nr4HP4Mev0zaP4TBymkPMdR552yAxM= Received: from localhost.localdomain ( [113.57.152.160]) by bizesmtp.qq.com (ESMTP) with id ; Fri, 06 Sep 2024 11:46:10 +0800 (CST) X-QQ-SSF: 0000000000000000000000000000000 X-QQ-GoodBg: 1 X-BIZMAIL-ID: 2951222773783350106 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 , "Maciej W . Rozycki" , Guan Wentao Subject: [RESEND. PATCH v2] MIPS: crypto: Clean up useless assignment operations Date: Fri, 6 Sep 2024 11:46:05 +0800 Message-ID: X-Mailer: git-send-email 2.43.4 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-QQ-SENDSIZE: 520 Feedback-ID: bizesmtp:uniontech.com:qybglogicsvrgz:qybglogicsvrgz8a-1 Content-Type: text/plain; charset="utf-8" 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 -=3D sizeof(u32)" is not necessary for 64-bit CPUs. After that, replace `while' loops with equivalent `for' to make the code structure a little bit better by the way. Suggested-by: Maciej W. Rozycki Link: https://lore.kernel.org/all/alpine.DEB.2.21.2406281713040.43454@angie= .orcam.me.uk/ Signed-off-by: Guan Wentao Signed-off-by: WangYuli --- arch/mips/crypto/crc32-mips.c | 27 +++++++-------------------- 1 file changed, 7 insertions(+), 20 deletions(-) diff --git a/arch/mips/crypto/crc32-mips.c b/arch/mips/crypto/crc32-mips.c index ec6d58008f8e..3a80b7576ec3 100644 --- a/arch/mips/crypto/crc32-mips.c +++ b/arch/mips/crypto/crc32-mips.c @@ -77,36 +77,29 @@ static u32 crc32_mips_le_hw(u32 crc_, const u8 *p, unsi= gned int len) { u32 crc =3D crc_; =20 -#ifdef CONFIG_64BIT - while (len >=3D sizeof(u64)) { +#if IS_ENABLED(CONFIG_64BIT) + for (; len >=3D sizeof(u64); p +=3D sizeof(u64), len -=3D sizeof(u64)) { u64 value =3D get_unaligned_le64(p); - CRC32(crc, value, d); - p +=3D sizeof(u64); - len -=3D sizeof(u64); } =20 if (len & sizeof(u32)) { #else /* !CONFIG_64BIT */ - while (len >=3D sizeof(u32)) { + for (; len >=3D sizeof(u32); len -=3D sizeof(u32)) { #endif u32 value =3D get_unaligned_le32(p); - CRC32(crc, value, w); p +=3D sizeof(u32); - len -=3D sizeof(u32); } =20 if (len & sizeof(u16)) { u16 value =3D get_unaligned_le16(p); - CRC32(crc, value, h); p +=3D sizeof(u16); } =20 if (len & sizeof(u8)) { u8 value =3D *p++; - CRC32(crc, value, b); } =20 @@ -117,38 +110,32 @@ static u32 crc32c_mips_le_hw(u32 crc_, const u8 *p, u= nsigned int len) { u32 crc =3D crc_; =20 -#ifdef CONFIG_64BIT - while (len >=3D sizeof(u64)) { +#if IS_ENABLED(CONFIG_64BIT) + for (; len >=3D sizeof(u64); p +=3D sizeof(u64), len -=3D sizeof(u64)) { u64 value =3D get_unaligned_le64(p); - CRC32C(crc, value, d); - p +=3D sizeof(u64); - len -=3D sizeof(u64); } =20 if (len & sizeof(u32)) { #else /* !CONFIG_64BIT */ - while (len >=3D sizeof(u32)) { + for (; len >=3D sizeof(u32); len -=3D sizeof(u32)) { #endif u32 value =3D get_unaligned_le32(p); - CRC32C(crc, value, w); p +=3D sizeof(u32); - len -=3D sizeof(u32); } =20 if (len & sizeof(u16)) { u16 value =3D get_unaligned_le16(p); - CRC32C(crc, value, h); p +=3D sizeof(u16); } =20 if (len & sizeof(u8)) { u8 value =3D *p++; - CRC32C(crc, value, b); } + return crc; } =20 --=20 2.43.4