linux-kernel - Re: [PATCH 07/11] vhost: convert vhost_umem_interval

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Date:   Fri, 4 Oct 2019 12:44:46 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     Michel Lespinasse <walken@...gle.com>
Cc:     akpm@...ux-foundation.org, peterz@...radead.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        dri-devel@...ts.freedesktop.org, linux-rdma@...r.kernel.org,
        Michael@...gle.com, Jason Wang <jasowang@...hat.com>,
        virtualization@...ts.linux-foundation.org,
        Davidlohr Bueso <dbueso@...e.de>
Subject: Re: [PATCH 07/11] vhost: convert vhost_umem_interval_tree to half
 closed intervals

On Fri, 04 Oct 2019, Michel Lespinasse wrote:

>On Thu, Oct 03, 2019 at 01:18:54PM -0700, Davidlohr Bueso wrote:
>> @@ -1320,15 +1320,14 @@ static bool iotlb_access_ok(struct vhost_virtqueue *vq,
>>  {
>>  	const struct vhost_umem_node *node;
>>  	struct vhost_umem *umem = vq->iotlb;
>> -	u64 s = 0, size, orig_addr = addr, last = addr + len - 1;
>> +	u64 s = 0, size, orig_addr = addr, last = addr + len;
>
>maybe "end" or "end_addr" instead of "last".
>
>> diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
>> index e9ed2722b633..bb36cb9ed5ec 100644
>> --- a/drivers/vhost/vhost.h
>> +++ b/drivers/vhost/vhost.h
>> @@ -53,13 +53,13 @@ struct vhost_log {
>>  };
>>
>>  #define START(node) ((node)->start)
>> -#define LAST(node) ((node)->last)
>> +#define END(node) ((node)->end)
>>
>>  struct vhost_umem_node {
>>  	struct rb_node rb;
>>  	struct list_head link;
>>  	__u64 start;
>> -	__u64 last;
>> +	__u64 end;
>>  	__u64 size;
>>  	__u64 userspace_addr;
>>  	__u32 perm;
>
>Preferably also rename __subtree_last to __subtree_end

Yes, this was was another one that I had in mind renaming, but
didn't want to grow the series -- all custom interval trees
name _last for the subtree iirc. Like my previous reply, I'd
rather leave this stuff for a followup series.

Thanks,
Davidlohr