Re: [PATCH v3 4/9] null_blk: improve zone locking

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On 2020/11/17 2:00, Christoph Hellwig wrote:
> On Wed, Nov 11, 2020 at 10:00:44PM +0900, Damien Le Moal wrote:
>> +#define null_unlock_zone_res(dev, flags)				\
>> +	do {								\
>> +		if ((dev)->need_zone_res_mgmt)				\
>> +			spin_unlock_irqrestore(&(dev)->zone_res_lock,	\
>> +					       (flags));		\
>> +	} while (0)
> 
> Can you use inline functions here?

The macro make it easier to handle the save/restore flags compared to inline
function. I guess I could replace spin_lock_irqsave() with spin_lock_irq() and
spin_unlock_irqrestore() with spin_unlock_irq() since there is no nesting. But I
do not like these functions as they are error prone (if one misses their use and
starts nesting locks with the same functions). But no strong feeling against it
either. I can do the switch.

> 
> Otherwise this looks good to me:
> 
> Reviewed-by: Christoph Hellwig <hch@xxxxxx>
> 


-- 
Damien Le Moal
Western Digital Research




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