Revert "kunit: memcpy: Split slow memcpy tests into MEMCPY_SLOW_KUNIT_TEST"

This reverts commit 4acf1de3.

Commit d055c6a2 ("kunit: memcpy: Mark tests as slow using test
attributes") marks slow memcpy unit tests as slow. Since this commit,
the tests can be disabled with a module parameter, and the configuration
option to skip the slow tests is no longer needed. Revert the patch
introducing it.

Cc: David Gow <davidgow@google.com>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20240314151200.2285314-1-linux@roeck-us.netSigned-off-by: Kees Cook <keescook@chromium.org>

lib/Kconfig.debug

@@ -2703,18 +2703,6 @@ config MEMCPY_KUNIT_TEST
 
 	  If unsure, say N.
 
-config MEMCPY_SLOW_KUNIT_TEST
-	bool "Include exhaustive memcpy tests"
-	depends on MEMCPY_KUNIT_TEST
-	default y
-	help
-	  Some memcpy tests are quite exhaustive in checking for overlaps
-	  and bit ranges. These can be very slow, so they are split out
-	  as a separate config, in case they need to be disabled.
-
-	  Note this config option will be replaced by the use of KUnit test
-	  attributes.
-
 config IS_SIGNED_TYPE_KUNIT_TEST
 	tristate "Test is_signed_type() macro" if !KUNIT_ALL_TESTS
 	depends on KUNIT

lib/memcpy_kunit.c

@@ -309,9 +309,6 @@ static void set_random_nonzero(struct kunit *test, u8 *byte)
 
 static void init_large(struct kunit *test)
 {
-	if (!IS_ENABLED(CONFIG_MEMCPY_SLOW_KUNIT_TEST))
-		kunit_skip(test, "Slow test skipped. Enable with CONFIG_MEMCPY_SLOW_KUNIT_TEST=y");
-
 	/* Get many bit patterns. */
 	get_random_bytes(large_src, ARRAY_SIZE(large_src));