Merge branch 'x86-hash-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 hashing changes from Ingo Molnar:
 "Small fixes and cleanups to the librarized arch_fast_hash() methods,
  used by the net/openvswitch code"

* 'x86-hash-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86, hash: Simplify switch, add __init annotation
  x86, hash: Swap arguments passed to crc32_u32()
  x86, hash: Fix build failure with older binutils

2 files changed, 14 insertions, 9 deletions

diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index a414b1471ffc..3b9348a0c1a4 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -152,6 +152,7 @@ cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTI
 
 # does binutils support specific instructions?
 asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
+asinstr += $(call as-instr,crc32l %eax$(comma)%eax,-DCONFIG_AS_CRC32=1)
 avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)
 avx2_instr :=$(call as-instr,vpbroadcastb %xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1)
 
diff --git a/arch/x86/lib/hash.c b/arch/x86/lib/hash.c
index 3056702e81fb..ff4fa51a5b1f 100644
--- 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>
@@ -39,7 +40,11 @@
 
 static inline u32 crc32_u32(u32 crc, u32 val)
 {
+#ifdef CONFIG_AS_CRC32
         asm ("crc32l %1,%0\n" : "+r" (crc) : "rm" (val));
+#else
+        asm (".byte 0xf2, 0x0f, 0x38, 0xf1, 0xc1" : "+a" (crc) : "c" (val));
+#endif
         return crc;
 }
 
@@ -49,19 +54,18 @@ static u32 intel_crc4_2_hash(const void *data, u32 len, u32 seed)
         u32 i, tmp = 0;
 
         for (i = 0; i < len / 4; i++)
-                seed = crc32_u32(*p32++, seed);
+                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(tmp, seed);
-        default:
+                seed = crc32_u32(seed, tmp);
                 break;
         }
 
@@ -74,12 +78,12 @@ static u32 intel_crc4_2_hash2(const u32 *data, u32 len, u32 seed)
         u32 i;
 
         for (i = 0; i < len; i++)
-                seed = crc32_u32(*p32++, seed);
+                seed = crc32_u32(seed, *p32++);
 
         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;