netdev - Re: [PATCH v5 09/21] IB/hns: Add hca support

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Message-ID: <20160426142517.GA1937@nanopsycho.orion>
Date:	Tue, 26 Apr 2016 16:25:17 +0200
From:	Jiri Pirko <jiri@...nulli.us>
To:	Leon Romanovsky <leon@...nel.org>
Cc:	oulijun <oulijun@...wei.com>, dledford@...hat.com,
	sean.hefty@...el.com, hal.rosenstock@...il.com,
	davem@...emloft.net, jeffrey.t.kirsher@...el.com,
	jiri@...lanox.com, ogerlitz@...lanox.com, linuxarm@...wei.com,
	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, gongyangming@...wei.com,
	xiaokun@...wei.com, tangchaofei@...wei.com, haifeng.wei@...wei.com,
	yisen.zhuang@...wei.com, yankejian@...wei.com,
	lisheng011@...wei.com, charles.chenxin@...wei.com
Subject: Re: [PATCH v5 09/21] IB/hns: Add hca support

Tue, Apr 26, 2016 at 04:18:21PM CEST, leon@...nel.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.


>> 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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