netdev - Re: [PATCH resend mm,net-next 2/3] mm: Add vm_insert

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Message-ID: <20200213215407.GT7778@bombadil.infradead.org>
Date:   Thu, 13 Feb 2020 13:54:07 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     Arjun Roy <arjunroy.kdev@...il.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        akpm@...ux-foundation.org, linux-mm@...ck.org, arjunroy@...gle.com,
        Eric Dumazet <edumazet@...gle.com>,
        Soheil Hassas Yeganeh <soheil@...gle.com>
Subject: Re: [PATCH resend mm,net-next 2/3] mm: Add vm_insert_pages().

On Mon, Jan 27, 2020 at 06:59:57PM -0800, Arjun Roy wrote:
>  int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *);
> +int vm_insert_pages(struct vm_area_struct *vma, unsigned long addr,
> +			struct page **pages, unsigned long *num);
>  int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
>  			unsigned long pfn);

Sorry I didn't notice these patches earlier.  I'm not thrilled about
the addition of a new vm_insert_* operation; we're moving towards a
vmf_insert_* API.  There are almost no users left of vm_insert_page
(10, at a quick count).  Once they're all gone, we can switch the
underlying primitives over to a vm_fault_t return type and get rid of the
errno-to-vm-fault translation step that currently goes on.

So ... is this called in the fault path?  Do you have a struct vm_fault
around?  Can you handle a vm_fault_t return value instead of an errno?