From: Souptick Joarder <jrdr.linux@gmail.com>
To: Mike Rapoport <rppt@linux.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Matthew Wilcox <willy@infradead.org>,
Michal Hocko <mhocko@suse.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
vbabka@suse.cz, Rik van Riel <riel@surriel.com>,
Stephen Rothwell <sfr@canb.auug.org.au>,
rppt@linux.vnet.ibm.com, Peter Zijlstra <peterz@infradead.org>,
Russell King - ARM Linux <linux@armlinux.org.uk>,
robin.murphy@arm.com, iamjoonsoo.kim@lge.com, treding@nvidia.com,
Kees Cook <keescook@chromium.org>,
Marek Szyprowski <m.szyprowski@samsung.com>,
stefanr@s5r6.in-berlin.de, hjc@rock-chips.com,
Heiko Stuebner <heiko@sntech.de>,
airlied@linux.ie, oleksandr_andrushchenko@epam.com,
joro@8bytes.org, pawel@osciak.com,
Kyungmin Park <kyungmin.park@samsung.com>,
mchehab@kernel.org, Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Juergen Gross <jgross@suse.com>,
linux-kernel@vger.kernel.org, Linux-MM <linux-mm@kvack.org>,
linux-arm-kernel@lists.infradead.org,
linux1394-devel@lists.sourceforge.net,
dri-devel@lists.freedesktop.org,
linux-rockchip@lists.infradead.org, xen-devel@lists.xen.org,
iommu@lists.linux-foundation.org, linux-media@vger.kernel.org
Subject: Re: [PATCHv2 1/9] mm: Introduce new vm_insert_range and vm_insert_range_buggy API
Date: Thu, 7 Feb 2019 21:37:08 +0530 [thread overview]
Message-ID: <CAFqt6zbE0JD09ibp3jZ0rr5xp52SEK+Pi6pGMQwSp_=d0edy7g@mail.gmail.com> (raw)
In-Reply-To: <20190207155700.GA8040@rapoport-lnx>
On Thu, Feb 7, 2019 at 9:27 PM Mike Rapoport <rppt@linux.ibm.com> wrote:
>
> 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.
Thanks Mike. Noted.
Shall I consider it as *Reviewed-by:* with below changes ?
>
> > +/**
> > + * __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.
>
next prev parent reply other threads:[~2019-02-07 16:03 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-31 3:08 [PATCHv2 1/9] mm: Introduce new vm_insert_range and vm_insert_range_buggy API 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
2019-02-07 16:07 ` Souptick Joarder [this message]
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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