x86, hash: Simplify switch, add __init annotation

Minor cleanups:

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

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Link: http://lkml.kernel.org/r/530F09CE020000780011FBEF@nat28.tlf.novell.com
Cc: Francesco Fusco <ffusco@redhat.com>
Cc: Thomas Graf <tgraf@redhat.com>
Cc: David S. Miller <davem@davemloft.net>
Acked-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

diff --git a/arch/x86/lib/hash.c b/arch/x86/lib/hash.c
index ac628aa..ff4fa51 100644 (file)
--- a/arch/x86/lib/hash.c
+++ b/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 *data, u32 len, u32 seed)
        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 *data, u32 len, u32 seed)
        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;