On Mon, May 25, 2020 at 01:41:10PM -0700, Andrew Morton wrote:
>On Mon, 25 May 2020 18:32:16 +0300 Andy Shevchenko
><andriy.shevche...@linux.intel.com> wrote:
>
>> On Mon, May 25, 2020 at 02:43:12PM +0000, Wei Yang wrote:
>> > On Mon, May 25, 2020 at 12:14:58PM +0300, Andy Shevchenko wrote:
>> > >On Sun, May 24, 2020 at 12:35:51PM +0000, Wei Yang wrote:
>> > >> These two cases could be unified into one.
>> > >
>> > >Care to provide a test case which supports your change?
>
>I hurt my brain convincing myself, so I got practical:
>
>
>int fls(unsigned int x)
>{
> return x ? sizeof(x) * 8 - __builtin_clz(x) : 0;
>}
>
>static int get_count_order(unsigned l)
>{
> if (l == 0)
> return -1;
> else if (l & (l - 1UL))
> return fls(l);
> else
> return fls(l) - 1;
>}
>
>static int get_count_order2(unsigned long l)
>{
> if (l == 0)
> return -1;
> return fls(--l);
>}
>
>main()
>{
> unsigned i;
>
> for (i = 1; i < 64; i++) {
> printf("%d %d\n", get_count_order(i),
> get_count_order2(i));
> }
>}
>
>
>> >
>> > Hmm.. where should I put the test? tools/testing/selftests/ ?
>>
>> I guess into test_bitops.c [1]? I though it eventually should make kernel,
>> but I don't see it.
>>
>> Andrew, can you apply that or do you need Jesse to resend?
>>
>
>Got it.
I see the patch just merged, so I suppose to add the above test code into that
one?
--
Wei Yang
Help you, Help me
