linux-kernel - Re: [Patch v2] lib: test get_count_order/long in test

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Date:   Wed, 3 Jun 2020 13:29:43 +0000
From:   Wei Yang <richard.weiyang@...il.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Wei Yang <richard.weiyang@...il.com>, akpm@...ux-foundation.org,
        christian.brauner@...ntu.com, linux-kernel@...r.kernel.org
Subject: Re: [Patch v2] lib: test get_count_order/long in test_bitops.c

On Wed, Jun 03, 2020 at 12:18:02PM +0300, Andy Shevchenko wrote:
>On Tue, Jun 02, 2020 at 10:37:28PM +0000, Wei Yang wrote:
>> Add some test for get_count_order/long in test_bitops.c.
>
>Thanks! LGTM,
>Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
>
>Note, we can have as many MODULE_AUTHOR() lines as we want.
>

Ah, got it.

>> Signed-off-by: Wei Yang <richard.weiyang@...il.com>
>> 
>> ---
>> v2: merge the test into test_bitops.c
>> ---
>>  lib/Kconfig.debug | 10 +++++-----
>>  lib/test_bitops.c | 40 ++++++++++++++++++++++++++++++++++++++--
>>  2 files changed, 43 insertions(+), 7 deletions(-)
>> 
>> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
>> index f80d5609798f..512111a72e34 100644
>> --- a/lib/Kconfig.debug
>> +++ b/lib/Kconfig.debug
>> @@ -1987,15 +1987,15 @@ config TEST_LKM
>>  	  If unsure, say N.
>>  
>>  config TEST_BITOPS
>> -	tristate "Test module for compilation of clear_bit/set_bit operations"
>> +	tristate "Test module for compilation of bitops operations"
>>  	depends on m
>>  	help
>>  	  This builds the "test_bitops" module that is much like the
>>  	  TEST_LKM module except that it does a basic exercise of the
>> -	  clear_bit and set_bit macros to make sure there are no compiler
>> -	  warnings from C=1 sparse checker or -Wextra compilations. It has
>> -	  no dependencies and doesn't run or load unless explicitly requested
>> -	  by name.  for example: modprobe test_bitops.
>> +	  set/clear_bit macros and get_count_order/long to make sure there are
>> +	  no compiler warnings from C=1 sparse checker or -Wextra
>> +	  compilations. It has no dependencies and doesn't run or load unless
>> +	  explicitly requested by name.  for example: modprobe test_bitops.
>>  
>>  	  If unsure, say N.
>>  
>> diff --git a/lib/test_bitops.c b/lib/test_bitops.c
>> index fd50b3ae4a14..702d5973a5b6 100644
>> --- a/lib/test_bitops.c
>> +++ b/lib/test_bitops.c
>> @@ -9,7 +9,11 @@
>>  #include <linux/module.h>
>>  #include <linux/printk.h>
>>  
>> -/* a tiny module only meant to test set/clear_bit */
>> +/* a tiny module only meant to test
>> + *
>> + *   set/clear_bit
>> + *   get_count_order/long
>> + */
>>  
>>  /* use an enum because thats the most common BITMAP usage */
>>  enum bitops_fun {
>> @@ -24,6 +28,26 @@ enum bitops_fun {
>>  
>>  static DECLARE_BITMAP(g_bitmap, BITOPS_LENGTH);
>>  
>> +unsigned int order_comb[][2] = {
>> +	{0x00000003,  2},
>> +	{0x00000004,  2},
>> +	{0x00001fff, 13},
>> +	{0x00002000, 13},
>> +	{0x50000000, 31},
>> +	{0x80000000, 31},
>> +	{0x80003000, 32},
>> +};
>> +
>> +unsigned long order_comb_long[][2] = {
>> +	{0x0000000300000000, 34},
>> +	{0x0000000400000000, 34},
>> +	{0x00001fff00000000, 45},
>> +	{0x0000200000000000, 45},
>> +	{0x5000000000000000, 63},
>> +	{0x8000000000000000, 63},
>> +	{0x8000300000000000, 64},
>> +};
>> +
>>  static int __init test_bitops_startup(void)
>>  {
>>  	pr_warn("Loaded test module\n");
>> @@ -32,6 +56,18 @@ static int __init test_bitops_startup(void)
>>  	set_bit(BITOPS_11, g_bitmap);
>>  	set_bit(BITOPS_31, g_bitmap);
>>  	set_bit(BITOPS_88, g_bitmap);
>> +
>> +	for (i = 0; i < ARRAY_SIZE(order_comb); i++) {
>> +		if (order_comb[i][1] != get_count_order(order_comb[i][0]))
>> +			pr_warn("get_count_order wrong for %x\n",
>> +				       order_comb[i][0]); }
>> +
>> +	for (i = 0; i < ARRAY_SIZE(order_comb_long); i++) {
>> +		if (order_comb_long[i][1] !=
>> +			       get_count_order_long(order_comb_long[i][0]))
>> +			pr_warn("get_count_order_long wrong for %lx\n",
>> +				       order_comb_long[i][0]); }
>> +
>>  	return 0;
>>  }
>>  
>> @@ -55,6 +91,6 @@ static void __exit test_bitops_unstartup(void)
>>  module_init(test_bitops_startup);
>>  module_exit(test_bitops_unstartup);
>>  
>> -MODULE_AUTHOR("Jesse Brandeburg <jesse.brandeburg@...el.com>");
>> +MODULE_AUTHOR("Jesse Brandeburg <jesse.brandeburg@...el.com>, Wei Yang <richard.weiyang@...il.com>");
>>  MODULE_LICENSE("GPL");
>>  MODULE_DESCRIPTION("Bit testing module");
>> -- 
>> 2.23.0
>> 
>
>-- 
>With Best Regards,
>Andy Shevchenko
>

-- 
Wei Yang
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