linux-kernel - [PATCH 4/6] test_hash.c: split test_hash

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Message-Id: <20210826012626.1163705-5-isabellabdoamaral@usp.br>
Date:   Wed, 25 Aug 2021 22:26:24 -0300
From:   Isabella Basso <isabellabdoamaral@....br>
To:     linux@...encehorizons.net, geert@...ux-m68k.org
Cc:     ferreiraenzoa@...il.com, augusto.duraes33@...il.com,
        brendanhiggins@...gle.com, dlatypov@...gle.com,
        davidgow@...gle.com, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org, kunit-dev@...glegroups.com,
        ~lkcamp/patches@...ts.sr.ht, rodrigosiqueiramelo@...il.com,
        Isabella Basso <isabellabdoamaral@....br>
Subject: [PATCH 4/6] test_hash.c: split test_hash_init

Split up test_hash_init so that it calls each test more explicitly
insofar it is possible without rewriting the entire file. This aims at
improving readability.

Split tests performed on string_or as they don't interfere with those
performed in hash_or. Also separate pr_info calls about skipped tests as
they're not part of the tests themselves, but only warn about
(un)defined arch-specific hash functions.

Signed-off-by: Isabella Basso <isabellabdoamaral@....br>
---
 lib/test_hash.c | 65 ++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 54 insertions(+), 11 deletions(-)

diff --git a/lib/test_hash.c b/lib/test_hash.c
index ed75c768c231..c168823b0963 100644
--- a/lib/test_hash.c
+++ b/lib/test_hash.c
@@ -152,8 +152,37 @@ test_int_hash(unsigned long long h64)
 	return true;
 }
 
-static int __init
-test_hash_init(void)
+static int __init test_string_or(void)
+{
+	char buf[SIZE+1];
+	int i, j;
+	u32 h0;
+
+	string_or = 0;
+	fill_buf(buf, SIZE, 1);
+
+	/* Test every possible non-empty substring in the buffer. */
+	for (j = SIZE; j > 0; j--) {
+		buf[j] = '\0';
+
+		for (i = 0; i <= j; i++) {
+			h0 = full_name_hash(buf+i, buf+i, j-i);
+
+			string_or |= h0;
+		} /* i */
+	} /* j */
+
+	/* The OR of all the hash values should cover all the bits */
+	if (~string_or) {
+		pr_err("OR of all string hash results = %#x != %#x",
+		       string_or, -1u);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int __init test_hash_or(void)
 {
 	char buf[SIZE+1];
 	unsigned tests = 0;
@@ -186,7 +215,6 @@ test_hash_init(void)
 				return -EINVAL;
 			}
 
-			string_or |= h0;
 			h64 = h64 << 32 | h0;	/* For use with hash_64 */
 			if (!test_int_hash(h64))
 				return -EINVAL;
@@ -194,12 +222,6 @@ test_hash_init(void)
 		} /* i */
 	} /* j */
 
-	/* The OR of all the hash values should cover all the bits */
-	if (~string_or) {
-		pr_err("OR of all string hash results = %#x != %#x",
-			string_or, -1u);
-		return -EINVAL;
-	}
 	if (~hash_or[0][0]) {
 		pr_err("OR of all __hash_32 results = %#x != %#x",
 		       hash_or[0][0], -1u);
@@ -231,6 +253,13 @@ test_hash_init(void)
 		}
 	}
 
+	pr_notice("%u tests passed.", tests);
+
+	return 0;
+}
+
+static void __init notice_skipped_tests(void)
+{
 	/* Issue notices about skipped tests. */
 #ifdef HAVE_ARCH__HASH_32
 #if HAVE_ARCH__HASH_32 != 1
@@ -246,10 +275,24 @@ test_hash_init(void)
 #else
 	pr_info("hash_64() has no arch implementation to test.");
 #endif
+}
 
-	pr_notice("%u tests passed.", tests);
+static int __init
+test_hash_init(void)
+{
+	int ret;
 
-	return 0;
+	ret = test_string_or();
+	if (ret < 0)
+		return ret;
+
+	ret = test_hash_or();
+	if (ret < 0)
+		return ret;
+
+	notice_skipped_tests();
+
+	return ret;
 }
 
 static void __exit test_hash_exit(void)
-- 
2.33.0