[PATCH 1/6] hash.h: remove unused define directive

From: Isabella Basso
Date: Wed Aug 25 2021 - 21:26:42 EST


The HAVE_ARCH_HASH_32 (single underscore) define hasn't been used for
any known supported architectures that have their own hash function
implementation (i.e. m68k, Microblaze, H8/300, pa-risc) since George's
patch [1], which introduced it.

The supported 32-bit architectures from the list above have only been
making use of the (more general) HAVE_ARCH__HASH_32 define, which only
lacks the right shift operator, that wasn't targeted for optimizations
so far.

[1] https://lore.kernel.org/lkml/20160525073311.5600.qmail@xxxxxxxxxxxxxxxxxxxxxx/

Co-developed-by: Augusto Durães Camargo <augusto.duraes33@xxxxxxxxx>
Signed-off-by: Augusto Durães Camargo <augusto.duraes33@xxxxxxxxx>
Co-developed-by: Enzo Ferreira <ferreiraenzoa@xxxxxxxxx>
Signed-off-by: Enzo Ferreira <ferreiraenzoa@xxxxxxxxx>
Signed-off-by: Isabella Basso <isabellabdoamaral@xxxxxx>
---
include/linux/hash.h | 5 +----
lib/test_hash.c | 24 +-----------------------
tools/include/linux/hash.h | 5 +----
3 files changed, 3 insertions(+), 31 deletions(-)

diff --git a/include/linux/hash.h b/include/linux/hash.h
index ad6fa21d977b..38edaa08f862 100644
--- a/include/linux/hash.h
+++ b/include/linux/hash.h
@@ -62,10 +62,7 @@ static inline u32 __hash_32_generic(u32 val)
return val * GOLDEN_RATIO_32;
}

-#ifndef HAVE_ARCH_HASH_32
-#define hash_32 hash_32_generic
-#endif
-static inline u32 hash_32_generic(u32 val, unsigned int bits)
+static inline u32 hash_32(u32 val, unsigned int bits)
{
/* High bits are more random, so use them. */
return __hash_32(val) >> (32 - bits);
diff --git a/lib/test_hash.c b/lib/test_hash.c
index 0ee40b4a56dd..d4b0cfdb0377 100644
--- a/lib/test_hash.c
+++ b/lib/test_hash.c
@@ -94,22 +94,7 @@ test_int_hash(unsigned long long h64, u32 hash_or[2][33])
pr_err("hash_32(%#x, %d) = %#x > %#x", h0, k, h1, m);
return false;
}
-#ifdef HAVE_ARCH_HASH_32
- h2 = hash_32_generic(h0, k);
-#if HAVE_ARCH_HASH_32 == 1
- if (h1 != h2) {
- pr_err("hash_32(%#x, %d) = %#x != hash_32_generic() "
- " = %#x", h0, k, h1, h2);
- return false;
- }
-#else
- if (h2 > m) {
- pr_err("hash_32_generic(%#x, %d) = %#x > %#x",
- h0, k, h1, m);
- return false;
- }
-#endif
-#endif
+
/* Test hash_64 */
hash_or[1][k] |= h1 = hash_64(h64, k);
if (h1 > m) {
@@ -227,13 +212,6 @@ test_hash_init(void)
#else
pr_info("__hash_32() has no arch implementation to test.");
#endif
-#ifdef HAVE_ARCH_HASH_32
-#if HAVE_ARCH_HASH_32 != 1
- pr_info("hash_32() is arch-specific; not compared to generic.");
-#endif
-#else
- pr_info("hash_32() has no arch implementation to test.");
-#endif
#ifdef HAVE_ARCH_HASH_64
#if HAVE_ARCH_HASH_64 != 1
pr_info("hash_64() is arch-specific; not compared to generic.");
diff --git a/tools/include/linux/hash.h b/tools/include/linux/hash.h
index ad6fa21d977b..38edaa08f862 100644
--- a/tools/include/linux/hash.h
+++ b/tools/include/linux/hash.h
@@ -62,10 +62,7 @@ static inline u32 __hash_32_generic(u32 val)
return val * GOLDEN_RATIO_32;
}

-#ifndef HAVE_ARCH_HASH_32
-#define hash_32 hash_32_generic
-#endif
-static inline u32 hash_32_generic(u32 val, unsigned int bits)
+static inline u32 hash_32(u32 val, unsigned int bits)
{
/* High bits are more random, so use them. */
return __hash_32(val) >> (32 - bits);
--
2.33.0