[patch 26/55] test_hash.c: split test_int_hash into arch-specific functions

[Andrew Morton <akpm@linux-foundation.org>]

From: Isabella Basso <isabbasso@riseup.net>
Subject: test_hash.c: split test_int_hash into arch-specific functions

Split the test_int_hash function to keep its mainloop separate from
arch-specific chunks, which are only compiled as needed.  This aims at
improving readability.

Link: https://lkml.kernel.org/r/20211208183711.390454-3-isabbasso@riseup.net
Reviewed-by: David Gow <davidgow@google.com>
Tested-by: David Gow <davidgow@google.com>
Signed-off-by: Isabella Basso <isabbasso@riseup.net>
Cc: Augusto Durães Camargo <augusto.duraes33@gmail.com>
Cc: Brendan Higgins <brendanhiggins@google.com>
Cc: Daniel Latypov <dlatypov@google.com>
Cc: Enzo Ferreira <ferreiraenzoa@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: kernel test robot <lkp@intel.com>
Cc: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 lib/test_hash.c |   91 +++++++++++++++++++++++++++++++---------------
 1 file changed, 62 insertions(+), 29 deletions(-)

--- a/lib/test_hash.c~test_hashc-split-test_int_hash-into-arch-specific-functions
+++ a/lib/test_hash.c
@@ -56,6 +56,58 @@ fill_buf(char *buf, size_t len, u32 seed
 	}
 }
 
+/* Holds most testing variables for the int test. */
+struct test_hash_params {
+        /* Pointer to integer to be hashed. */
+	unsigned long long *h64;
+        /* Low 32-bits of integer to be hashed. */
+	u32 h0;
+        /* Arch-specific hash result. */
+	u32 h1;
+        /* Generic hash result. */
+	u32 h2;
+        /* ORed hashes of given size (in bits). */
+	u32 (*hash_or)[33];
+};
+
+#ifdef HAVE_ARCH__HASH_32
+static bool __init
+test_int__hash_32(struct test_hash_params *params)
+{
+	params->hash_or[1][0] |= params->h2 = __hash_32_generic(params->h0);
+#if HAVE_ARCH__HASH_32 == 1
+	if (params->h1 != params->h2) {
+		pr_err("__hash_32(%#x) = %#x != __hash_32_generic() = %#x",
+		       params->h0, params->h1, params->h2);
+		return false;
+	}
+#endif
+	return true;
+}
+#endif
+
+#ifdef HAVE_ARCH_HASH_64
+static bool __init
+test_int_hash_64(struct test_hash_params *params, u32 const *m, int *k)
+{
+	params->h2 = hash_64_generic(*params->h64, *k);
+#if HAVE_ARCH_HASH_64 == 1
+	if (params->h1 != params->h2) {
+		pr_err("hash_64(%#llx, %d) = %#x != hash_64_generic() = %#x",
+		       *params->h64, *k, params->h1, params->h2);
+		return false;
+	}
+#else
+	if (params->h2 > *m) {
+		pr_err("hash_64_generic(%#llx, %d) = %#x > %#x",
+		       *params->h64, *k, params->h1, *m);
+		return false;
+	}
+#endif
+	return true;
+}
+#endif
+
 /*
  * Test the various integer hash functions.  h64 (or its low-order bits)
  * is the integer to hash.  hash_or accumulates the OR of the hash values,
@@ -69,19 +121,13 @@ static bool __init
 test_int_hash(unsigned long long h64, u32 hash_or[2][33])
 {
 	int k;
-	u32 h0 = (u32)h64, h1, h2;
+	struct test_hash_params params = { &h64, (u32)h64, 0, 0, hash_or };
 
 	/* Test __hash32 */
-	hash_or[0][0] |= h1 = __hash_32(h0);
+	hash_or[0][0] |= params.h1 = __hash_32(params.h0);
 #ifdef HAVE_ARCH__HASH_32
-	hash_or[1][0] |= h2 = __hash_32_generic(h0);
-#if HAVE_ARCH__HASH_32 == 1
-	if (h1 != h2) {
-		pr_err("__hash_32(%#x) = %#x != __hash_32_generic() = %#x",
-			h0, h1, h2);
+	if (!test_int__hash_32(&params))
 		return false;
-	}
-#endif
 #endif
 
 	/* Test k = 1..32 bits */
@@ -89,37 +135,24 @@ test_int_hash(unsigned long long h64, u3
 		u32 const m = ((u32)2 << (k-1)) - 1;	/* Low k bits set */
 
 		/* Test hash_32 */
-		hash_or[0][k] |= h1 = hash_32(h0, k);
-		if (h1 > m) {
-			pr_err("hash_32(%#x, %d) = %#x > %#x", h0, k, h1, m);
+		hash_or[0][k] |= params.h1 = hash_32(params.h0, k);
+		if (params.h1 > m) {
+			pr_err("hash_32(%#x, %d) = %#x > %#x", params.h0, k, params.h1, m);
 			return false;
 		}
 
 		/* Test hash_64 */
-		hash_or[1][k] |= h1 = hash_64(h64, k);
-		if (h1 > m) {
-			pr_err("hash_64(%#llx, %d) = %#x > %#x", h64, k, h1, m);
+		hash_or[1][k] |= params.h1 = hash_64(h64, k);
+		if (params.h1 > m) {
+			pr_err("hash_64(%#llx, %d) = %#x > %#x", h64, k, params.h1, m);
 			return false;
 		}
 #ifdef HAVE_ARCH_HASH_64
-		h2 = hash_64_generic(h64, k);
-#if HAVE_ARCH_HASH_64 == 1
-		if (h1 != h2) {
-			pr_err("hash_64(%#llx, %d) = %#x != hash_64_generic() "
-				"= %#x", h64, k, h1, h2);
+		if (!test_int_hash_64(&params, &m, &k))
 			return false;
-		}
-#else
-		if (h2 > m) {
-			pr_err("hash_64_generic(%#llx, %d) = %#x > %#x",
-				h64, k, h1, m);
-			return false;
-		}
-#endif
 #endif
 	}
 
-	(void)h2;	/* Suppress unused variable warning */
 	return true;
 }
 
_