From: Tomasz Figa <tfiga@chromium.org>
To: Jason Gunthorpe <jgg@ziepe.ca>
Cc: "Marek Szyprowski" <m.szyprowski@samsung.com>,
"Daniel Vetter" <daniel.vetter@ffwll.ch>,
"DRI Development" <dri-devel@lists.freedesktop.org>,
LKML <linux-kernel@vger.kernel.org>,
"Daniel Vetter" <daniel.vetter@intel.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
"John Hubbard" <jhubbard@nvidia.com>,
"Jérôme Glisse" <jglisse@redhat.com>, "Jan Kara" <jack@suse.cz>,
"Dan Williams" <dan.j.williams@intel.com>,
"Linux MM" <linux-mm@kvack.org>,
"Linux ARM" <linux-arm-kernel@lists.infradead.org>,
"Pawel Osciak" <pawel@osciak.com>,
"Kyungmin Park" <kyungmin.park@samsung.com>,
"Inki Dae" <inki.dae@samsung.com>,
"Joonyoung Shim" <jy0922.shim@samsung.com>,
"Seung-Woo Kim" <sw0312.kim@samsung.com>,
linux-samsung-soc <linux-samsung-soc@vger.kernel.org>,
"open list:DMA BUFFER SHARING FRAMEWORK"
<linux-media@vger.kernel.org>,
"Oded Gabbay" <oded.gabbay@gmail.com>
Subject: Re: [PATCH 2/2] mm/frame-vec: use FOLL_LONGTERM
Date: Wed, 7 Oct 2020 14:47:55 +0200 [thread overview]
Message-ID: <CAAFQd5D0ahP-3hp_vGEmJ2cyBOMXeW9HX5yKaVPcQTsFwwOE8Q@mail.gmail.com> (raw)
In-Reply-To: <20201007124409.GN5177@ziepe.ca>
On Wed, Oct 7, 2020 at 2:44 PM Jason Gunthorpe <jgg@ziepe.ca> wrote:
>
> On Wed, Oct 07, 2020 at 02:33:56PM +0200, Marek Szyprowski wrote:
> > Well, it was in vb2_get_vma() function, but now I see that it has been
> > lost in fb639eb39154 and 6690c8c78c74 some time ago...
>
> There is no guarentee that holding a get on the file says anthing
> about the VMA. This needed to check that the file was some special
> kind of file that promised the VMA layout and file lifetime are
> connected.
>
> Also, cloning a VMA outside the mm world is just really bad. That
> would screw up many assumptions the drivers make.
>
> If it is all obsolete I say we hide it behind a default n config
> symbol and taint the kernel if anything uses it.
>
> Add a big comment above the follow_pfn to warn others away from this
> code.
Sadly it's just verbally declared as deprecated and not formally noted
anyway. There are a lot of userspace applications relying on user
pointer support.
WARNING: multiple messages have this Message-ID (diff)
From: Tomasz Figa <tfiga@chromium.org>
To: Jason Gunthorpe <jgg@ziepe.ca>
Cc: "Oded Gabbay" <oded.gabbay@gmail.com>,
"Inki Dae" <inki.dae@samsung.com>,
linux-samsung-soc <linux-samsung-soc@vger.kernel.org>,
"Jan Kara" <jack@suse.cz>,
"Joonyoung Shim" <jy0922.shim@samsung.com>,
"Pawel Osciak" <pawel@osciak.com>,
"Daniel Vetter" <daniel.vetter@ffwll.ch>,
"Seung-Woo Kim" <sw0312.kim@samsung.com>,
LKML <linux-kernel@vger.kernel.org>,
"DRI Development" <dri-devel@lists.freedesktop.org>,
"Kyungmin Park" <kyungmin.park@samsung.com>,
"Linux MM" <linux-mm@kvack.org>,
"Jérôme Glisse" <jglisse@redhat.com>,
"John Hubbard" <jhubbard@nvidia.com>,
"Daniel Vetter" <daniel.vetter@intel.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
"open list:DMA BUFFER SHARING FRAMEWORK"
<linux-media@vger.kernel.org>,
"Dan Williams" <dan.j.williams@intel.com>,
"Linux ARM" <linux-arm-kernel@lists.infradead.org>,
"Marek Szyprowski" <m.szyprowski@samsung.com>
Subject: Re: [PATCH 2/2] mm/frame-vec: use FOLL_LONGTERM
Date: Wed, 7 Oct 2020 14:47:55 +0200 [thread overview]
Message-ID: <CAAFQd5D0ahP-3hp_vGEmJ2cyBOMXeW9HX5yKaVPcQTsFwwOE8Q@mail.gmail.com> (raw)
In-Reply-To: <20201007124409.GN5177@ziepe.ca>
On Wed, Oct 7, 2020 at 2:44 PM Jason Gunthorpe <jgg@ziepe.ca> wrote:
>
> On Wed, Oct 07, 2020 at 02:33:56PM +0200, Marek Szyprowski wrote:
> > Well, it was in vb2_get_vma() function, but now I see that it has been
> > lost in fb639eb39154 and 6690c8c78c74 some time ago...
>
> There is no guarentee that holding a get on the file says anthing
> about the VMA. This needed to check that the file was some special
> kind of file that promised the VMA layout and file lifetime are
> connected.
>
> Also, cloning a VMA outside the mm world is just really bad. That
> would screw up many assumptions the drivers make.
>
> If it is all obsolete I say we hide it behind a default n config
> symbol and taint the kernel if anything uses it.
>
> Add a big comment above the follow_pfn to warn others away from this
> code.
Sadly it's just verbally declared as deprecated and not formally noted
anyway. There are a lot of userspace applications relying on user
pointer support.
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
WARNING: multiple messages have this Message-ID (diff)
From: Tomasz Figa <tfiga@chromium.org>
To: Jason Gunthorpe <jgg@ziepe.ca>
Cc: linux-samsung-soc <linux-samsung-soc@vger.kernel.org>,
"Jan Kara" <jack@suse.cz>,
"Joonyoung Shim" <jy0922.shim@samsung.com>,
"Pawel Osciak" <pawel@osciak.com>,
"Daniel Vetter" <daniel.vetter@ffwll.ch>,
"Seung-Woo Kim" <sw0312.kim@samsung.com>,
LKML <linux-kernel@vger.kernel.org>,
"DRI Development" <dri-devel@lists.freedesktop.org>,
"Kyungmin Park" <kyungmin.park@samsung.com>,
"Linux MM" <linux-mm@kvack.org>,
"Jérôme Glisse" <jglisse@redhat.com>,
"John Hubbard" <jhubbard@nvidia.com>,
"Daniel Vetter" <daniel.vetter@intel.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
"open list:DMA BUFFER SHARING FRAMEWORK"
<linux-media@vger.kernel.org>,
"Dan Williams" <dan.j.williams@intel.com>,
"Linux ARM" <linux-arm-kernel@lists.infradead.org>,
"Marek Szyprowski" <m.szyprowski@samsung.com>
Subject: Re: [PATCH 2/2] mm/frame-vec: use FOLL_LONGTERM
Date: Wed, 7 Oct 2020 14:47:55 +0200 [thread overview]
Message-ID: <CAAFQd5D0ahP-3hp_vGEmJ2cyBOMXeW9HX5yKaVPcQTsFwwOE8Q@mail.gmail.com> (raw)
In-Reply-To: <20201007124409.GN5177@ziepe.ca>
On Wed, Oct 7, 2020 at 2:44 PM Jason Gunthorpe <jgg@ziepe.ca> wrote:
>
> On Wed, Oct 07, 2020 at 02:33:56PM +0200, Marek Szyprowski wrote:
> > Well, it was in vb2_get_vma() function, but now I see that it has been
> > lost in fb639eb39154 and 6690c8c78c74 some time ago...
>
> There is no guarentee that holding a get on the file says anthing
> about the VMA. This needed to check that the file was some special
> kind of file that promised the VMA layout and file lifetime are
> connected.
>
> Also, cloning a VMA outside the mm world is just really bad. That
> would screw up many assumptions the drivers make.
>
> If it is all obsolete I say we hide it behind a default n config
> symbol and taint the kernel if anything uses it.
>
> Add a big comment above the follow_pfn to warn others away from this
> code.
Sadly it's just verbally declared as deprecated and not formally noted
anyway. There are a lot of userspace applications relying on user
pointer support.
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
next prev parent reply other threads:[~2020-10-07 12:48 UTC|newest]
Thread overview: 156+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-02 17:53 [PATCH 1/2] mm/frame-vec: Drop gup_flags from get_vaddr_frames() Daniel Vetter
2020-10-02 17:53 ` Daniel Vetter
2020-10-02 17:53 ` Daniel Vetter
2020-10-02 17:53 ` [PATCH 2/2] mm/frame-vec: use FOLL_LONGTERM Daniel Vetter
2020-10-02 17:53 ` Daniel Vetter
2020-10-02 17:53 ` Daniel Vetter
2020-10-02 18:06 ` Jason Gunthorpe
2020-10-02 18:06 ` Jason Gunthorpe
2020-10-02 18:06 ` Jason Gunthorpe
2020-10-02 18:16 ` Daniel Vetter
2020-10-02 18:16 ` Daniel Vetter
2020-10-02 18:16 ` Daniel Vetter
2020-10-02 23:31 ` Jason Gunthorpe
2020-10-02 23:31 ` Jason Gunthorpe
2020-10-02 23:31 ` Jason Gunthorpe
2020-10-03 8:34 ` Oded Gabbay
2020-10-03 8:34 ` Oded Gabbay
2020-10-03 8:34 ` Oded Gabbay
2020-10-03 9:40 ` Daniel Vetter
2020-10-03 9:40 ` Daniel Vetter
2020-10-03 9:40 ` Daniel Vetter
2020-10-04 12:50 ` Jason Gunthorpe
2020-10-04 12:50 ` Jason Gunthorpe
2020-10-04 12:50 ` Jason Gunthorpe
2020-10-04 16:09 ` Daniel Vetter
2020-10-04 16:09 ` Daniel Vetter
2020-10-04 16:09 ` Daniel Vetter
2020-10-05 17:28 ` Jason Gunthorpe
2020-10-05 17:28 ` Jason Gunthorpe
2020-10-05 17:28 ` Jason Gunthorpe
2020-10-05 18:16 ` Daniel Vetter
2020-10-05 18:16 ` Daniel Vetter
2020-10-05 18:16 ` Daniel Vetter
2020-10-05 18:37 ` Jason Gunthorpe
2020-10-05 18:37 ` Jason Gunthorpe
2020-10-05 18:37 ` Jason Gunthorpe
2020-10-05 18:54 ` Daniel Vetter
2020-10-05 18:54 ` Daniel Vetter
2020-10-05 18:54 ` Daniel Vetter
2020-10-05 22:43 ` Daniel Vetter
2020-10-05 22:43 ` Daniel Vetter
2020-10-05 22:43 ` Daniel Vetter
2020-10-05 23:41 ` Jason Gunthorpe
2020-10-05 23:41 ` Jason Gunthorpe
2020-10-05 23:41 ` Jason Gunthorpe
2020-10-06 6:23 ` Daniel Vetter
2020-10-06 6:23 ` Daniel Vetter
2020-10-06 6:23 ` Daniel Vetter
2020-10-06 12:26 ` Jason Gunthorpe
2020-10-06 12:26 ` Jason Gunthorpe
2020-10-06 12:26 ` Jason Gunthorpe
2020-10-06 13:08 ` Daniel Vetter
2020-10-06 13:08 ` Daniel Vetter
2020-10-06 13:08 ` Daniel Vetter
2020-10-07 10:47 ` Marek Szyprowski
2020-10-07 10:47 ` Marek Szyprowski
2020-10-07 10:47 ` Marek Szyprowski
2020-10-07 12:01 ` Daniel Vetter
2020-10-07 12:01 ` Daniel Vetter
2020-10-07 12:01 ` Daniel Vetter
2020-10-07 12:33 ` Marek Szyprowski
2020-10-07 12:33 ` Marek Szyprowski
2020-10-07 12:33 ` Marek Szyprowski
2020-10-07 12:44 ` Jason Gunthorpe
2020-10-07 12:44 ` Jason Gunthorpe
2020-10-07 12:44 ` Jason Gunthorpe
2020-10-07 12:47 ` Tomasz Figa [this message]
2020-10-07 12:47 ` Tomasz Figa
2020-10-07 12:47 ` Tomasz Figa
2020-10-07 12:58 ` Daniel Vetter
2020-10-07 12:58 ` Daniel Vetter
2020-10-07 12:58 ` Daniel Vetter
2020-10-07 13:06 ` Jason Gunthorpe
2020-10-07 13:06 ` Jason Gunthorpe
2020-10-07 13:06 ` Jason Gunthorpe
2020-10-07 13:34 ` Tomasz Figa
2020-10-07 13:34 ` Tomasz Figa
2020-10-07 13:34 ` Tomasz Figa
2020-10-07 13:42 ` Jason Gunthorpe
2020-10-07 13:42 ` Jason Gunthorpe
2020-10-07 13:42 ` Jason Gunthorpe
2020-10-07 14:08 ` Daniel Vetter
2020-10-07 14:08 ` Daniel Vetter
2020-10-07 14:08 ` Daniel Vetter
2020-10-07 14:11 ` Tomasz Figa
2020-10-07 14:11 ` Tomasz Figa
2020-10-07 14:11 ` Tomasz Figa
2020-10-07 14:22 ` Daniel Vetter
2020-10-07 14:22 ` Daniel Vetter
2020-10-07 14:22 ` Daniel Vetter
2020-10-07 15:05 ` Tomasz Figa
2020-10-07 15:05 ` Tomasz Figa
2020-10-07 15:05 ` Tomasz Figa
2020-10-07 14:58 ` Jason Gunthorpe
2020-10-07 14:58 ` Jason Gunthorpe
2020-10-07 14:58 ` Jason Gunthorpe
2020-10-07 13:06 ` Tomasz Figa
2020-10-07 13:06 ` Tomasz Figa
2020-10-07 13:06 ` Tomasz Figa
2020-10-07 13:14 ` Jason Gunthorpe
2020-10-07 13:14 ` Jason Gunthorpe
2020-10-07 13:14 ` Jason Gunthorpe
2020-10-05 15:03 ` Jan Kara
2020-10-05 15:03 ` Jan Kara
2020-10-05 15:03 ` Jan Kara
2020-10-02 22:39 ` John Hubbard
2020-10-02 22:39 ` John Hubbard
2020-10-02 22:39 ` John Hubbard
2020-10-03 9:45 ` Daniel Vetter
2020-10-03 9:45 ` Daniel Vetter
2020-10-03 9:45 ` Daniel Vetter
2020-10-03 22:52 ` John Hubbard
2020-10-03 22:52 ` John Hubbard
2020-10-03 22:52 ` John Hubbard
2020-10-03 23:24 ` Jason Gunthorpe
2020-10-03 23:24 ` Jason Gunthorpe
2020-10-03 23:24 ` Jason Gunthorpe
2020-10-04 11:20 ` Daniel Vetter
2020-10-04 11:20 ` Daniel Vetter
2020-10-04 11:20 ` Daniel Vetter
2020-10-05 17:35 ` Jason Gunthorpe
2020-10-05 17:35 ` Jason Gunthorpe
2020-10-05 17:35 ` Jason Gunthorpe
2020-10-02 18:22 ` [PATCH 1/2] mm/frame-vec: Drop gup_flags from get_vaddr_frames() Tomasz Figa
2020-10-02 18:22 ` Tomasz Figa
2020-10-02 18:22 ` Tomasz Figa
2020-10-02 18:22 ` Tomasz Figa
2020-10-02 19:21 ` Oded Gabbay
2020-10-02 19:21 ` Oded Gabbay
2020-10-02 19:21 ` Oded Gabbay
2020-10-02 19:21 ` Oded Gabbay
2020-10-05 17:38 [PATCH 2/2] mm/frame-vec: use FOLL_LONGTERM Jason Gunthorpe
2020-10-05 17:38 ` Jason Gunthorpe
2020-10-05 17:47 ` Jason Gunthorpe
2020-10-05 17:47 ` Jason Gunthorpe
2020-10-05 17:47 ` Jason Gunthorpe
2020-10-06 3:36 ` Andrew Morton
2020-10-06 3:36 ` Andrew Morton
2020-10-06 3:36 ` Andrew Morton
2020-10-06 11:57 ` Jason Gunthorpe
2020-10-06 11:57 ` Jason Gunthorpe
2020-10-06 11:57 ` Jason Gunthorpe
2020-10-05 17:53 ` Jan Kara
2020-10-05 17:53 ` Jan Kara
2020-10-05 17:53 ` Jan Kara
2020-10-05 17:57 ` Jason Gunthorpe
2020-10-05 17:57 ` Jason Gunthorpe
2020-10-05 17:57 ` Jason Gunthorpe
2020-10-05 18:16 ` Daniel Vetter
2020-10-05 18:16 ` Daniel Vetter
2020-10-05 18:16 ` Daniel Vetter
2020-10-05 18:16 ` Daniel Vetter
2020-10-06 11:56 ` Daniel Vetter
2020-10-06 11:56 ` Daniel Vetter
2020-10-06 11:56 ` Daniel Vetter
2020-10-06 11:56 ` Daniel Vetter
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