linux-kernel - Re: [PATCH 3/5] RDMA/uverbs: add owner parameter to ib_umem

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Date:   Tue, 29 Jan 2019 10:29:56 -0800
From:   Ira Weiny <ira.weiny@...el.com>
To:     Joel Nider <joeln@...ibm.com>
Cc:     Jason Gunthorpe <jgg@...pe.ca>, Leon Romanovsky <leon@...nel.org>,
        Doug Ledford <dledford@...hat.com>,
        Mike Rapoport <rppt@...ux.ibm.com>, linux-mm@...ck.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] RDMA/uverbs: add owner parameter to ib_umem_get

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@...ibm.com>
> ---

[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