linux-kernel - Re: [PATCH v3 1/9] mm: Introduce new vm_insert

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Message-ID: <20181207171116.GA29923@bombadil.infradead.org>
Date:   Fri, 7 Dec 2018 09:11:16 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Souptick Joarder <jrdr.linux@...il.com>, akpm@...ux-foundation.org,
        mhocko@...e.com, kirill.shutemov@...ux.intel.com, vbabka@...e.cz,
        riel@...riel.com, sfr@...b.auug.org.au, rppt@...ux.vnet.ibm.com,
        peterz@...radead.org, linux@...linux.org.uk,
        iamjoonsoo.kim@....com, treding@...dia.com, keescook@...omium.org,
        m.szyprowski@...sung.com, stefanr@...6.in-berlin.de,
        hjc@...k-chips.com, heiko@...ech.de, airlied@...ux.ie,
        oleksandr_andrushchenko@...m.com, joro@...tes.org,
        pawel@...iak.com, kyungmin.park@...sung.com, mchehab@...nel.org,
        boris.ostrovsky@...cle.com, jgross@...e.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-arm-kernel@...ts.infradead.org,
        linux1394-devel@...ts.sourceforge.net,
        dri-devel@...ts.freedesktop.org,
        linux-rockchip@...ts.infradead.org, xen-devel@...ts.xen.org,
        iommu@...ts.linux-foundation.org, linux-media@...r.kernel.org
Subject: Re: [PATCH v3 1/9] mm: Introduce new vm_insert_range API

On Fri, Dec 07, 2018 at 03:34:56PM +0000, Robin Murphy wrote:
> > +int vm_insert_range(struct vm_area_struct *vma, unsigned long addr,
> > +			struct page **pages, unsigned long page_count)
> > +{
> > +	unsigned long uaddr = addr;
> > +	int ret = 0, i;
> 
> Some of the sites being replaced were effectively ensuring that vma and
> pages were mutually compatible as an initial condition - would it be worth
> adding something here for robustness, e.g.:
> 
> +	if (page_count != vma_pages(vma))
> +		return -ENXIO;

I think we want to allow this to be used to populate part of a VMA.
So perhaps:

	if (page_count > vma_pages(vma))
		return -ENXIO;