linux-kernel - [PATCH v3] MIPS: crypto: Clean up useless assignment operations

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Message-ID: <C4F76EB9DD3AEFEB+20240906064002.404538-1-wangyuli@uniontech.com>
Date: Fri,  6 Sep 2024 14:40:02 +0800
From: WangYuli <wangyuli@...ontech.com>
To: herbert@...dor.apana.org.au,
	davem@...emloft.net,
	tsbogend@...ha.franken.de
Cc: linux-crypto@...r.kernel.org,
	linux-mips@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	WangYuli <wangyuli@...ontech.com>,
	"Maciej W . Rozycki" <macro@...am.me.uk>,
	Guan Wentao <guanwentao@...ontech.com>
Subject: [PATCH v3] MIPS: crypto: Clean up useless assignment operations

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.

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 <macro@...am.me.uk>
Link: https://lore.kernel.org/all/alpine.DEB.2.21.2406281713040.43454@angie.orcam.me.uk/
Suggested-by: Herbert Xu <herbert@...dor.apana.org.au>
Link: https://lore.kernel.org/all/ZtqZpzMH_qMQqzyc@gondor.apana.org.au/
Signed-off-by: Guan Wentao <guanwentao@...ontech.com>
Signed-off-by: WangYuli <wangyuli@...ontech.com>
---
 arch/mips/crypto/crc32-mips.c | 70 ++++++++++++++++++-----------------
 1 file changed, 37 insertions(+), 33 deletions(-)

diff --git a/arch/mips/crypto/crc32-mips.c b/arch/mips/crypto/crc32-mips.c
index ec6d58008f8e..2a59b85f88aa 100644
--- a/arch/mips/crypto/crc32-mips.c
+++ b/arch/mips/crypto/crc32-mips.c
@@ -77,24 +77,26 @@ static u32 crc32_mips_le_hw(u32 crc_, const u8 *p, unsigned int len)
 {
 	u32 crc = crc_;
 
-#ifdef CONFIG_64BIT
-	while (len >= sizeof(u64)) {
-		u64 value = get_unaligned_le64(p);
-
-		CRC32(crc, value, d);
-		p += sizeof(u64);
-		len -= sizeof(u64);
-	}
-
-	if (len & sizeof(u32)) {
-#else /* !CONFIG_64BIT */
-	while (len >= sizeof(u32)) {
-#endif
-		u32 value = get_unaligned_le32(p);
-
-		CRC32(crc, value, w);
-		p += sizeof(u32);
-		len -= sizeof(u32);
+	if (IS_ENABLED(CONFIG_64BIT)) {
+		for (; len >= sizeof(u64); p += sizeof(u64), len -= sizeof(u64)) {
+			u64 value = get_unaligned_le64(p);
+
+			CRC32(crc, value, d);
+		}
+
+		if (len & sizeof(u32)) {
+			u32 value = get_unaligned_le32(p);
+
+			CRC32(crc, value, w);
+			p += sizeof(u32);
+		}
+	} else {
+		for (; len >= sizeof(u32); len -= sizeof(u32)) {
+			u32 value = get_unaligned_le32(p);
+
+			CRC32(crc, value, w);
+			p += sizeof(u32);
+		}
 	}
 
 	if (len & sizeof(u16)) {
@@ -117,24 +119,26 @@ static u32 crc32c_mips_le_hw(u32 crc_, const u8 *p, unsigned int len)
 {
 	u32 crc = crc_;
 
-#ifdef CONFIG_64BIT
-	while (len >= sizeof(u64)) {
-		u64 value = get_unaligned_le64(p);
+	if (IS_ENABLED(CONFIG_64BIT)) {
+		for (; len >= sizeof(u64); p += sizeof(u64), len -= sizeof(u64)) {
+			u64 value = get_unaligned_le64(p);
 
-		CRC32C(crc, value, d);
-		p += sizeof(u64);
-		len -= sizeof(u64);
-	}
+			CRC32(crc, value, d);
+		}
 
-	if (len & sizeof(u32)) {
-#else /* !CONFIG_64BIT */
-	while (len >= sizeof(u32)) {
-#endif
-		u32 value = get_unaligned_le32(p);
+		if (len & sizeof(u32)) {
+			u32 value = get_unaligned_le32(p);
+
+			CRC32(crc, value, w);
+			p += sizeof(u32);
+		}
+	} else {
+		for (; len >= sizeof(u32); len -= sizeof(u32)) {
+			u32 value = get_unaligned_le32(p);
 
-		CRC32C(crc, value, w);
-		p += sizeof(u32);
-		len -= sizeof(u32);
+			CRC32(crc, value, w);
+			p += sizeof(u32);
+		}
 	}
 
 	if (len & sizeof(u16)) {
-- 
2.43.4