Hi Jason,
> From: Jason Gunthorpe <j...@nvidia.com>
> Sent: Tuesday, March 2, 2021 8:52 PM
>
> 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.
Oops. will be careful in next version. Perhaps no need to re-indent
the existing fields to avoid the whitespace?
>
> Also, Linus has been unhappy before to see lists of bool's in structs
> due to the huge amount of memory they waste.
How about something like below? I can do it if Alex is fine with it.
u64 v2:1;
u64 nesting:1;
u64 dirty_page_tracking:1;
u64 pinned_page_dirty_scope:1;
u64 container_open:1;
u64 reserved:59;
And thanks for sharing me what Linus prefers.
Regards,
Yi Liu
> Jason
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