linux-kernel - Re: [PATCH V2 2/2] lib/test_bits.c: Add tests for GENMASK

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Message-ID: <d94c44df-055b-4fd1-a384-28ce5ce59921@arm.com>
Date: Wed, 31 Jul 2024 09:41:19 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: Yury Norov <yury.norov@...il.com>
Cc: linux-kernel@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>,
 Rasmus Villemoes <linux@...musvillemoes.dk>, Arnd Bergmann <arnd@...db.de>,
 linux-arch@...r.kernel.org
Subject: Re: [PATCH V2 2/2] lib/test_bits.c: Add tests for GENMASK_U128()



On 7/30/24 23:50, Yury Norov wrote:
> On Thu, Jul 25, 2024 at 11:18:08AM +0530, Anshuman Khandual wrote:
>> This adds GENMASK_U128() tests although currently only 64 bit wide masks
>> are being tested.
>>
>> Cc: Andrew Morton <akpm@...ux-foundation.org>
>> Cc: linux-kernel@...r.kernel.org
>> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
>> ---
>>  lib/test_bits.c | 25 +++++++++++++++++++++++++
>>  1 file changed, 25 insertions(+)
>>
>> diff --git a/lib/test_bits.c b/lib/test_bits.c
>> index 01313980f175..f0d1033cf3c9 100644
>> --- a/lib/test_bits.c
>> +++ b/lib/test_bits.c
>> @@ -39,6 +39,26 @@ static void genmask_ull_test(struct kunit *test)
>>  #endif
>>  }
>>  
>> +#ifdef CONFIG_ARCH_SUPPORTS_INT128
> 
> Can you move this ifdefery inside the function scope, so that you'll
> not have do it below in tests array declarattion?

Sure, will fold in the following changes in here.

diff --git a/lib/test_bits.c b/lib/test_bits.c
index f0d1033cf3c9..f8b058974d07 100644
--- a/lib/test_bits.c
+++ b/lib/test_bits.c
@@ -39,9 +39,9 @@ static void genmask_ull_test(struct kunit *test)
 #endif
 }
 
-#ifdef CONFIG_ARCH_SUPPORTS_INT128
 static void genmask_u128_test(struct kunit *test)
 {
+#ifdef CONFIG_ARCH_SUPPORTS_INT128
        /* Tests mask generation only when the mask width is within 64 bits */
        KUNIT_EXPECT_EQ(test, 0x0000000000ff0000ULL, GENMASK_U128(87, 80) >> 64);
        KUNIT_EXPECT_EQ(test, 0x0000000000ffffffULL, GENMASK_U128(87, 64) >> 64);
@@ -56,8 +56,8 @@ static void genmask_u128_test(struct kunit *test)
        GENMASK_U128(0, 10);
        GENMASK_U128(9, 10);
 #endif
-}
 #endif
+}
 
 static void genmask_input_check_test(struct kunit *test)
 {
@@ -84,9 +84,7 @@ static void genmask_input_check_test(struct kunit *test)
 static struct kunit_case bits_test_cases[] = {
        KUNIT_CASE(genmask_test),
        KUNIT_CASE(genmask_ull_test),
-#ifdef CONFIG_ARCH_SUPPORTS_INT128
        KUNIT_CASE(genmask_u128_test),
-#endif
        KUNIT_CASE(genmask_input_check_test),
        {}
 };


> 
>> +static void genmask_u128_test(struct kunit *test)
>> +{
>> +	/* Tests mask generation only when the mask width is within 64 bits */
>> +	KUNIT_EXPECT_EQ(test, 0x0000000000ff0000ULL, GENMASK_U128(87, 80) >> 64);
>> +	KUNIT_EXPECT_EQ(test, 0x0000000000ffffffULL, GENMASK_U128(87, 64) >> 64);
>> +	KUNIT_EXPECT_EQ(test, 0x0000000000000001ULL, GENMASK_U128(0, 0));
>> +	KUNIT_EXPECT_EQ(test, 0xffffffffffffffffULL, GENMASK_U128(63, 0));
>> +	KUNIT_EXPECT_EQ(test, 0xffffffffffffffffULL, GENMASK_U128(64, 0) >> 1);
>> +	KUNIT_EXPECT_EQ(test, 0x00000000ffffffffULL, GENMASK_U128(81, 50) >> 50);
>> +
>> +#ifdef TEST_GENMASK_FAILURES
>> +	/* these should fail compilation */
>> +	GENMASK_U128(0, 1);
>> +	GENMASK_U128(0, 10);
>> +	GENMASK_U128(9, 10);
>> +#endif
>> +}
>> +#endif
>> +
>>  static void genmask_input_check_test(struct kunit *test)
>>  {
>>  	unsigned int x, y;
>> @@ -56,12 +76,17 @@ static void genmask_input_check_test(struct kunit *test)
>>  	/* Valid input */
>>  	KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(1, 1));
>>  	KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(39, 21));
>> +	KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(100, 80));
>> +	KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(110, 65));
>>  }
>>  
>>  
>>  static struct kunit_case bits_test_cases[] = {
>>  	KUNIT_CASE(genmask_test),
>>  	KUNIT_CASE(genmask_ull_test),
>> +#ifdef CONFIG_ARCH_SUPPORTS_INT128
>> +	KUNIT_CASE(genmask_u128_test),
>> +#endif
>>  	KUNIT_CASE(genmask_input_check_test),
>>  	{}
>>  };
>> -- 
>> 2.30.2