Re: [Patch v8 03/10] vfio/type1: Report iommu nesting info to userspace

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On Wed, Mar 03, 2021 at 04:35:38AM +0800, Liu Yi L wrote:
> diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
> index 4bb162c1d649..3a5c84d4f19b 100644
> +++ b/drivers/vfio/vfio_iommu_type1.c
> @@ -63,22 +63,24 @@ MODULE_PARM_DESC(dma_entry_limit,
>  		 "Maximum number of user DMA mappings per container (65535).");
>  
>  struct vfio_iommu {
> -	struct list_head	domain_list;
> -	struct list_head	iova_list;
> -	struct vfio_domain	*external_domain; /* domain for external user */
> -	struct mutex		lock;
> -	struct rb_root		dma_list;
> -	struct blocking_notifier_head notifier;
> -	unsigned int		dma_avail;
> -	unsigned int		vaddr_invalid_count;
> -	uint64_t		pgsize_bitmap;
> -	uint64_t		num_non_pinned_groups;
> -	wait_queue_head_t	vaddr_wait;
> -	bool			v2;
> -	bool			nesting;
> -	bool			dirty_page_tracking;
> -	bool			pinned_page_dirty_scope;
> -	bool			container_open;
> +	struct list_head		domain_list;
> +	struct list_head		iova_list;
> +	/* domain for external user */
> +	struct vfio_domain		*external_domain;
> +	struct mutex			lock;
> +	struct rb_root			dma_list;
> +	struct blocking_notifier_head	notifier;
> +	unsigned int			dma_avail;
> +	unsigned int			vaddr_invalid_count;
> +	uint64_t			pgsize_bitmap;
> +	uint64_t			num_non_pinned_groups;
> +	wait_queue_head_t		vaddr_wait;
> +	struct iommu_nesting_info	*nesting_info;
> +	bool				v2;
> +	bool				nesting;
> +	bool				dirty_page_tracking;
> +	bool				pinned_page_dirty_scope;
> +	bool				container_open;
>  };

I always hate seeing one line patches done like this. If you want to
re-indent you should remove the horizontal whitespace, not add an
unreadable amount more.

Also, Linus has been unhappy before to see lists of bool's in structs
due to the huge amount of memory they waste.

Jason



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