On 2016/4/26 22:25, Jiri Pirko wrote:
> Tue, Apr 26, 2016 at 04:18:21PM CEST, l...@kernel.org wrote:
>> On Tue, Apr 26, 2016 at 02:34:44PM +0800, oulijun wrote:
>>> On 2016/4/24 15:54, Leon Romanovsky wrote:
>
> <snip>
>
>>>>> +int hns_roce_bitmap_alloc(struct hns_roce_bitmap *bitmap, u32 *obj)
>>>>> +{
>>>>> + int ret = 0;
>>>>> +
>>>>> + spin_lock(&bitmap->lock);
>>>>> + *obj = find_next_zero_bit(bitmap->table, bitmap->max, bitmap->last);
>>>>> + if (*obj >= bitmap->max) {
>>>>> + bitmap->top = (bitmap->top + bitmap->max + bitmap->reserved_top)
>>>>> + & bitmap->mask;
>>>>> + *obj = find_first_zero_bit(bitmap->table, bitmap->max);
>>>>
>>>> find_first_zero_bit function returns "unsigned long" which may or may
>>>> not be equal to u32 on some architectures.
>>>>
>>> Hi Leon,
>>> I appreciate your keen eye. this code is meant for ARM64bit therefore
>>> should run corretly for 64-bit AARCH64.
>
> The driver should run correctly on any arch.
>
Hi Jiri Pirko,
Our driver run in ARM64 platform by depending on Kconfig. It will be
configure in Kconfig file.
Thanks
Lijun Ou
>
>>> I will consider changing it as part of good partice and better portability "
>>> I will give a primary plan to modified it.
>>> for example:
>>> *obj = (u32)find_next_zero_bit(bitmap->table, bitmap->max,
>>> bitmap->last);
>>> Beause the max size of bitmap->table is u32 in current version.
>>>
>>> int hns_roce_bitmap_init(struct hns_roce_bitmap *bitmap, u32 num, u32 mask,
>>> u32 reserved_bot, u32 reserved_top)
>>> {
>>> u32 i;
>>>
>>> if (num != roundup_pow_of_two(num))
>>> return -EINVAL;
>>>
>>> bitmap->last = 0;
>>> bitmap->top = 0;
>>> bitmap->max = num - reserved_top;
>>> bitmap->mask = mask;
>>> bitmap->reserved_top = reserved_top;
>>> spin_lock_init(&bitmap->lock);
>>> bitmap->table = kcalloc(BITS_TO_LONGS(bitmap->max), sizeof(long),
>>> GFP_KERNEL);
>>>
>>> Is this plan ok?
>>
>> No,
>> You are submitting new driver, please do it properly (without casting)
>>from the beginning.
>>
>>>
>>> Thanks
>>> Lijun Ou
>>>
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>
>
>
> .
>
