Re: [PATCH 3/5] RDMA/uverbs: add owner parameter to ib_umem_get

[Ira Weiny]

On Tue, Jan 29, 2019 at 03:26:24PM +0200, Joel Nider wrote:
> ib_umem_get is a core function used by drivers that support RDMA.
> The 'owner' parameter signifies the process that owns the memory.
> Until now, it was assumed that the owning process was the current
> process. This adds the flexibility to specify a process other than
> the current process. All drivers that call this function are also
> updated, but the default behaviour is to keep backwards
> compatibility by assuming the current process is the owner when
> the 'owner' parameter is NULL.
> 
> Signed-off-by: Joel Nider <joeln@xxxxxxxxxx>
> ---

[snip]

> @@ -183,10 +196,11 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
>  
>  	while (npages) {
>  		down_read(&mm->mmap_sem);
> -		ret = get_user_pages_longterm(cur_base,
> +		ret = get_user_pages_remote_longterm(owner_task,
> +				     mm, cur_base,
>  				     min_t(unsigned long, npages,
> -					   PAGE_SIZE / sizeof (struct page *)),
> -				     gup_flags, page_list, vma_list);
> +				     PAGE_SIZE / sizeof(struct page *)),
> +				     gup_flags, page_list, vma_list, NULL);

qib was recently converted to get_user_pages_longterm.  So qib would need to
be updated as well.

Ira