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From: Mike Rapoport <rppt@linux.ibm.com>
To: Souptick Joarder <jrdr.linux@gmail.com>
Cc: Michal Hocko <mhocko@suse.com>, Heiko Stuebner <heiko@sntech.de>,
	Peter Zijlstra <peterz@infradead.org>,
	dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
	Linux-MM <linux-mm@kvack.org>,
	linux1394-devel@lists.sourceforge.net,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	Stephen Rothwell <sfr@canb.auug.org.au>,
	oleksandr_andrushchenko@epam.com, joro@8bytes.org,
	Russell King - ARM Linux <linux@armlinux.org.uk>,
	Matthew Wilcox <willy@infradead.org>,
	airlied@linux.ie, linux-arm-kernel@lists.infradead.org,
	linux-rockchip@lists.infradead.org, treding@nvidia.com,
	linux-media@vger.kernel.org, Kees Cook <keescook@chromium.org>,
	pawel@osciak.com, Rik van Riel <riel@surriel.com>,
	iommu@lists.linux-foundation.org, rppt@linux.vnet.ibm.com,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>,
	mchehab@kernel.org, iamjoonsoo.kim@lge.com, vbabka@suse.cz,
	Juergen Gross <jgross@suse.com>,
	hjc@rock-chips.com, xen-devel@lists.xen.org,
	Kyungmin Park <kyungmin.park@samsung.com>,
	stefanr@s5r6.in-berlin.de,
	Andrew Morton <akpm@linux-foundation.org>,
	robin.murphy@arm.com,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: Re: [PATCHv2 1/9] mm: Introduce new vm_insert_range and vm_insert_range_buggy API
Date: Thu, 7 Feb 2019 17:57:00 +0200
Message-ID: <20190207155700.GA8040@rapoport-lnx> (raw)
In-Reply-To: <CAFqt6za9xA_8OKiaaHXcO9go+RtPdjLY5Bz_fgQL+DZbermNhA@mail.gmail.com>

Hi Souptick,

On Thu, Feb 07, 2019 at 09:19:47PM +0530, Souptick Joarder wrote:
> Hi Mike,
> 
> Just thought to take opinion for documentation before placing it in v3.
> Does it looks fine ?
 
Overall looks good to me. Several minor points below.

> +/**
> + * __vm_insert_range - insert range of kernel pages into user vma
> + * @vma: user vma to map to
> + * @pages: pointer to array of source kernel pages
> + * @num: number of pages in page array
> + * @offset: user's requested vm_pgoff
> + *
> + * This allow drivers to insert range of kernel pages into a user vma.

          allows
> + *
> + * Return: 0 on success and error code otherwise.
> + */
> +static int __vm_insert_range(struct vm_area_struct *vma, struct page **pages,
> +                               unsigned long num, unsigned long offset)
> 
> 
> +/**
> + * vm_insert_range - insert range of kernel pages starts with non zero offset
> + * @vma: user vma to map to
> + * @pages: pointer to array of source kernel pages
> + * @num: number of pages in page array
> + *
> + * Maps an object consisting of `num' `pages', catering for the user's
                                   @num pages
> + * requested vm_pgoff
> + *
> + * If we fail to insert any page into the vma, the function will return
> + * immediately leaving any previously inserted pages present.  Callers
> + * from the mmap handler may immediately return the error as their caller
> + * will destroy the vma, removing any successfully inserted pages. Other
> + * callers should make their own arrangements for calling unmap_region().
> + *
> + * Context: Process context. Called by mmap handlers.
> + * Return: 0 on success and error code otherwise.
> + */
> +int vm_insert_range(struct vm_area_struct *vma, struct page **pages,
> +                               unsigned long num)
> 
> 
> +/**
> + * vm_insert_range_buggy - insert range of kernel pages starts with zero offset
> + * @vma: user vma to map to
> + * @pages: pointer to array of source kernel pages
> + * @num: number of pages in page array
> + *
> + * Similar to vm_insert_range(), except that it explicitly sets @vm_pgoff to

                                                                  the offset

> + * 0. This function is intended for the drivers that did not consider
> + * @vm_pgoff.
> + *
> + * Context: Process context. Called by mmap handlers.
> + * Return: 0 on success and error code otherwise.
> + */
> +int vm_insert_range_buggy(struct vm_area_struct *vma, struct page **pages,
> +                               unsigned long num)
> 

-- 
Sincerely yours,
Mike.


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Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-31  3:08 Souptick Joarder
2019-01-31  8:38 ` Mike Rapoport
2019-01-31 10:13   ` Souptick Joarder
2019-01-31 11:06     ` Mike Rapoport
2019-02-07 15:49   ` Souptick Joarder
2019-02-07 15:57     ` Mike Rapoport [this message]
2019-02-07 16:07       ` Souptick Joarder
2019-02-07 16:04         ` Mike Rapoport
2019-02-07 16:47     ` Matthew Wilcox
2019-02-08  5:22       ` Souptick Joarder
2019-02-11 17:06         ` Souptick Joarder
2019-01-31 12:06 ` Heiko Stuebner
2019-01-31 12:31   ` Souptick Joarder
2019-01-31 12:34     ` Heiko Stuebner
2019-02-01 12:38       ` Souptick Joarder

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