linux-kernel - [PATCH v2 3/3] x86/hash: cleanup

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Message-Id: <530F09CE020000780011FBEF@nat28.tlf.novell.com>
Date:	Thu, 27 Feb 2014 08:47:58 +0000
From:	"Jan Beulich" <JBeulich@...e.com>
To:	<mingo@...e.hu>, <tglx@...utronix.de>,
	"Jan Beulich" <JBeulich@...e.com>, <hpa@...or.com>
Cc:	<davem@...emloft.net>, <dborkman@...hat.com>, <ffusco@...hat.com>,
	<tgraf@...hat.com>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 3/3] x86/hash: cleanup

- simplify switch statement
- add __init annotation to setup_arch_fast_hash()

Signed-off-by: Jan Beulich <jbeulich@...e.com>
Cc: Francesco Fusco <ffusco@...hat.com>
Cc: Daniel Borkmann <dborkman@...hat.com>
Cc: Thomas Graf <tgraf@...hat.com>
Cc: David S. Miller <davem@...emloft.net>
---
 arch/x86/lib/hash.c |   12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

--- 3.14-rc4-x86-hash-crc32.orig/arch/x86/lib/hash.c
+++ 3.14-rc4-x86-hash-crc32/arch/x86/lib/hash.c
@@ -32,6 +32,7 @@
  */
 
 #include <linux/hash.h>
+#include <linux/init.h>
 
 #include <asm/processor.h>
 #include <asm/cpufeature.h>
@@ -55,17 +56,16 @@ static u32 intel_crc4_2_hash(const void 
 	for (i = 0; i < len / 4; i++)
 		seed = crc32_u32(seed, *p32++);
 
-	switch (3 - (len & 0x03)) {
-	case 0:
+	switch (len & 3) {
+	case 3:
 		tmp |= *((const u8 *) p32 + 2) << 16;
 		/* fallthrough */
-	case 1:
+	case 2:
 		tmp |= *((const u8 *) p32 + 1) << 8;
 		/* fallthrough */
-	case 2:
+	case 1:
 		tmp |= *((const u8 *) p32);
 		seed = crc32_u32(seed, tmp);
-	default:
 		break;
 	}
 
@@ -83,7 +83,7 @@ static u32 intel_crc4_2_hash2(const u32 
 	return seed;
 }
 
-void setup_arch_fast_hash(struct fast_hash_ops *ops)
+void __init setup_arch_fast_hash(struct fast_hash_ops *ops)
 {
 	if (cpu_has_xmm4_2) {
 		ops->hash  = intel_crc4_2_hash;



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