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From: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>
To: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
Cc: Mark Rutland <Mark.Rutland-5wv7dgnIgG8@public.gmane.org>,
	"devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	"linux-samsung-soc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-samsung-soc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Pawel Moll <Pawel.Moll-5wv7dgnIgG8@public.gmane.org>,
	Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>,
	Grant Grundler <grundler-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>,
	Ian Campbell
	<ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org>,
	Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>,
	"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Marc Zyngier <Marc.Zyngier-5wv7dgnIgG8@public.gmane.org>,
	"iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org"
	<iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org>,
	Thierry Reding
	<thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	Kumar Gala <galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
	"linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Cho KyongHo <pullip.cho-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>,
	Dave P Martin <Dave.Martin-5wv7dgnIgG8@public.gmane.org>
Subject: Re: [PATCH v2] devicetree: Add generic IOMMU device tree bindings
Date: Fri, 20 Jun 2014 17:53:08 +0200	[thread overview]
Message-ID: <39682213.otHMo6zoRf@wuerfel> (raw)
In-Reply-To: <20140618101439.GF32699-5wv7dgnIgG8@public.gmane.org>

On Wednesday 18 June 2014 11:14:39 Will Deacon wrote:
> On Wed, Jun 18, 2014 at 12:37:16AM +0100, Thierry Reding wrote:
>   - Each master has a set of fixed StreamIDs
>   - StreamIDs can be remastered by adding a constant offset (this could also
>     be used to describe RequesterID -> StreamID mapping)
> 
> I'd hope this would be sufficient for most people. Dynamic ID assignment can
> be worked out later (I'm not even sure it belongs in this binding) and any
> mappings other than `add a constant offset' can be treated on a case-by-case
> basis. We don't want to throw the kitchen sink at a language for describing
> arbitrary transformations!
> 
> > We've had similar discussions before (power sequences anyone?) where we
> > tried to come up with a generic way to describe something in device tree
> > that just didn't work out too well. Some things are better done in code,
> > so I think we should at least consider that possibility rather than
> > blindly try and force everything into device tree.
> 
> If we can support 90% of SoCs with a simple DT-based description, we can
> address the corner cases as they arise. I'm not ruling our hardcoding
> topology if we have no choice, but I don't think that's a healthy place to
> start from.

So we could use the "arm,gicv3" comaptible string for all those that
have a relatively simple mapping, and describe that mapping entirely
in DT properties, but use a different compatible string for those
SoCs that have a mapping which we can't easily describe, and then
put that into code?

	Arnd

WARNING: multiple messages have this Message-ID (diff)
From: Arnd Bergmann <arnd@arndb.de>
To: linux-arm-kernel@lists.infradead.org
Cc: Will Deacon <will.deacon@arm.com>,
	Thierry Reding <thierry.reding@gmail.com>,
	Mark Rutland <Mark.Rutland@arm.com>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"linux-samsung-soc@vger.kernel.org" 
	<linux-samsung-soc@vger.kernel.org>,
	Pawel Moll <Pawel.Moll@arm.com>,
	Stephen Warren <swarren@wwwdotorg.org>,
	Grant Grundler <grundler@chromium.org>,
	Joerg Roedel <joro@8bytes.org>,
	Ian Campbell <ijc+devicetree@hellion.org.uk>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Marc Zyngier <Marc.Zyngier@arm.com>,
	"iommu@lists.linux-foundation.org"
	<iommu@lists.linux-foundation.org>,
	Rob Herring <robh+dt@kernel.org>,
	Kumar Gala <galak@codeaurora.org>,
	"linux-tegra@vger.kernel.org" <linux-tegra@vger.kernel.org>,
	Cho KyongHo <pullip.cho@samsung.com>,
	Dave P Martin <Dave.Martin@arm.com>,
	Hiroshi Doyu <hdoyu@nvidia.com>
Subject: Re: [PATCH v2] devicetree: Add generic IOMMU device tree bindings
Date: Fri, 20 Jun 2014 17:53:08 +0200	[thread overview]
Message-ID: <39682213.otHMo6zoRf@wuerfel> (raw)
In-Reply-To: <20140618101439.GF32699@arm.com>

On Wednesday 18 June 2014 11:14:39 Will Deacon wrote:
> On Wed, Jun 18, 2014 at 12:37:16AM +0100, Thierry Reding wrote:
>   - Each master has a set of fixed StreamIDs
>   - StreamIDs can be remastered by adding a constant offset (this could also
>     be used to describe RequesterID -> StreamID mapping)
> 
> I'd hope this would be sufficient for most people. Dynamic ID assignment can
> be worked out later (I'm not even sure it belongs in this binding) and any
> mappings other than `add a constant offset' can be treated on a case-by-case
> basis. We don't want to throw the kitchen sink at a language for describing
> arbitrary transformations!
> 
> > We've had similar discussions before (power sequences anyone?) where we
> > tried to come up with a generic way to describe something in device tree
> > that just didn't work out too well. Some things are better done in code,
> > so I think we should at least consider that possibility rather than
> > blindly try and force everything into device tree.
> 
> If we can support 90% of SoCs with a simple DT-based description, we can
> address the corner cases as they arise. I'm not ruling our hardcoding
> topology if we have no choice, but I don't think that's a healthy place to
> start from.

So we could use the "arm,gicv3" comaptible string for all those that
have a relatively simple mapping, and describe that mapping entirely
in DT properties, but use a different compatible string for those
SoCs that have a mapping which we can't easily describe, and then
put that into code?

	Arnd

WARNING: multiple messages have this Message-ID (diff)
From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2] devicetree: Add generic IOMMU device tree bindings
Date: Fri, 20 Jun 2014 17:53:08 +0200	[thread overview]
Message-ID: <39682213.otHMo6zoRf@wuerfel> (raw)
In-Reply-To: <20140618101439.GF32699@arm.com>

On Wednesday 18 June 2014 11:14:39 Will Deacon wrote:
> On Wed, Jun 18, 2014 at 12:37:16AM +0100, Thierry Reding wrote:
>   - Each master has a set of fixed StreamIDs
>   - StreamIDs can be remastered by adding a constant offset (this could also
>     be used to describe RequesterID -> StreamID mapping)
> 
> I'd hope this would be sufficient for most people. Dynamic ID assignment can
> be worked out later (I'm not even sure it belongs in this binding) and any
> mappings other than `add a constant offset' can be treated on a case-by-case
> basis. We don't want to throw the kitchen sink at a language for describing
> arbitrary transformations!
> 
> > We've had similar discussions before (power sequences anyone?) where we
> > tried to come up with a generic way to describe something in device tree
> > that just didn't work out too well. Some things are better done in code,
> > so I think we should at least consider that possibility rather than
> > blindly try and force everything into device tree.
> 
> If we can support 90% of SoCs with a simple DT-based description, we can
> address the corner cases as they arise. I'm not ruling our hardcoding
> topology if we have no choice, but I don't think that's a healthy place to
> start from.

So we could use the "arm,gicv3" comaptible string for all those that
have a relatively simple mapping, and describe that mapping entirely
in DT properties, but use a different compatible string for those
SoCs that have a mapping which we can't easily describe, and then
put that into code?

	Arnd

  parent reply	other threads:[~2014-06-20 15:53 UTC|newest]

Thread overview: 215+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-05-23 20:36 [PATCH v2] devicetree: Add generic IOMMU device tree bindings Thierry Reding
2014-05-23 20:36 ` Thierry Reding
2014-05-23 20:36 ` Thierry Reding
     [not found] ` <1400877395-4235-1-git-send-email-thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-05-29 15:52   ` Stephen Warren
2014-05-29 15:52     ` Stephen Warren
2014-05-29 15:52     ` Stephen Warren
2014-05-30  7:30     ` Thierry Reding
2014-05-30  7:30       ` Thierry Reding
2014-05-30 11:27       ` Dave Martin
2014-05-30 11:27         ` Dave Martin
2014-05-30 11:27         ` Dave Martin
     [not found]         ` <20140530112728.GB3949-M5GwZQ6tE7x5pKCnmE3YQBJ8xKzm50AiAL8bYrjMMd8@public.gmane.org>
2014-05-30 19:11           ` Arnd Bergmann
2014-05-30 19:11             ` Arnd Bergmann
2014-05-30 19:11             ` Arnd Bergmann
2014-06-02 10:56             ` Dave Martin
2014-06-02 10:56               ` Dave Martin
2014-06-02 10:56               ` Dave Martin
2014-06-04 21:12         ` Thierry Reding
2014-06-04 21:12           ` Thierry Reding
2014-06-04 21:12           ` Thierry Reding
2014-06-16 12:57           ` Will Deacon
2014-06-16 12:57             ` Will Deacon
2014-06-16 12:57             ` Will Deacon
2014-06-17 11:58             ` Thierry Reding
2014-06-17 11:58               ` Thierry Reding
2014-06-17 11:58               ` Thierry Reding
2014-06-17 12:18               ` Will Deacon
2014-06-17 12:18                 ` Will Deacon
2014-06-17 12:18                 ` Will Deacon
2014-06-17 23:37                 ` Thierry Reding
2014-06-17 23:37                   ` Thierry Reding
2014-06-17 23:37                   ` Thierry Reding
2014-06-18 10:14                   ` Will Deacon
2014-06-18 10:14                     ` Will Deacon
2014-06-18 10:14                     ` Will Deacon
     [not found]                     ` <20140618101439.GF32699-5wv7dgnIgG8@public.gmane.org>
2014-06-20 15:53                       ` Arnd Bergmann [this message]
2014-06-20 15:53                         ` Arnd Bergmann
2014-06-20 15:53                         ` Arnd Bergmann
2014-06-20 17:50                         ` Will Deacon
2014-06-20 17:50                           ` Will Deacon
2014-06-20 17:50                           ` Will Deacon
2014-06-20 18:55                           ` Arnd Bergmann
2014-06-20 18:55                             ` Arnd Bergmann
2014-06-20 18:55                             ` Arnd Bergmann
2014-05-30 11:22   ` Dave Martin
2014-05-30 11:22     ` Dave Martin
2014-05-30 11:22     ` Dave Martin
     [not found]     ` <20140530112226.GA3949-M5GwZQ6tE7x5pKCnmE3YQBJ8xKzm50AiAL8bYrjMMd8@public.gmane.org>
2014-05-30 19:01       ` Arnd Bergmann
2014-05-30 19:01         ` Arnd Bergmann
2014-05-30 19:01         ` Arnd Bergmann
2014-06-02 11:44         ` Dave Martin
2014-06-02 11:44           ` Dave Martin
2014-06-02 11:44           ` Dave Martin
2014-06-04 21:32         ` Thierry Reding
2014-06-04 21:32           ` Thierry Reding
2014-06-04 21:32           ` Thierry Reding
2014-06-05  9:42           ` Arnd Bergmann
2014-06-05  9:42             ` Arnd Bergmann
2014-06-05  9:42             ` Arnd Bergmann
  -- strict thread matches above, loose matches on Subject: below --
2014-06-06 22:45 Thierry Reding
2014-06-06 22:45 ` Thierry Reding
2014-06-07 13:22 ` Arnd Bergmann
2014-06-07 13:22   ` Arnd Bergmann
2014-06-07 13:22   ` Arnd Bergmann
2014-06-09 10:49   ` Thierry Reding
2014-06-09 10:49     ` Thierry Reding
2014-06-09 10:49     ` Thierry Reding
2014-05-23 20:33 Thierry Reding
     [not found] ` <1400877218-4113-1-git-send-email-thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-05-30 13:16   ` Rob Herring
2014-05-30 13:16     ` Rob Herring
2014-05-30 13:16     ` Rob Herring
     [not found]     ` <CAL_JsqKumG1PSFoVfeGpLLG+MjXFeF4aUjun=vv1BJpaxk0Byg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-05-30 19:06       ` Arnd Bergmann
2014-05-30 19:06         ` Arnd Bergmann
2014-05-30 19:06         ` Arnd Bergmann
2014-05-30 19:29         ` Hiroshi Doyu
2014-05-30 19:29           ` Hiroshi Doyu
2014-05-30 19:29           ` Hiroshi Doyu
2014-05-30 19:54           ` Arnd Bergmann
2014-05-30 19:54             ` Arnd Bergmann
2014-05-30 19:54             ` Arnd Bergmann
2014-06-01  9:55             ` Will Deacon
2014-06-01  9:55               ` Will Deacon
2014-06-01  9:55               ` Will Deacon
     [not found]               ` <20140601095546.GA8625-5wv7dgnIgG8@public.gmane.org>
2014-06-04 13:39                 ` Thierry Reding
2014-06-04 13:39                   ` Thierry Reding
2014-06-04 13:39                   ` Thierry Reding
2014-06-04 13:44             ` Thierry Reding
2014-06-04 13:44               ` Thierry Reding
2014-06-04 13:44               ` Thierry Reding
2014-06-04 13:53               ` Arnd Bergmann
2014-06-04 13:53                 ` Arnd Bergmann
2014-06-04 13:53                 ` Arnd Bergmann
2014-06-04 13:56               ` Will Deacon
2014-06-04 13:56                 ` Will Deacon
2014-06-04 13:56                 ` Will Deacon
     [not found]                 ` <20140604135600.GD6644-5wv7dgnIgG8@public.gmane.org>
2014-06-04 14:01                   ` Arnd Bergmann
2014-06-04 14:01                     ` Arnd Bergmann
2014-06-04 14:01                     ` Arnd Bergmann
2014-06-04 16:39                     ` Will Deacon
2014-06-04 16:39                       ` Will Deacon
2014-06-04 16:39                       ` Will Deacon
2014-05-30 19:31         ` Rob Herring
2014-05-30 19:31           ` Rob Herring
2014-05-30 19:31           ` Rob Herring
     [not found]           ` <CAL_Jsq+tkFNpjSEZboT+o69B_Z3a8e-ZVKaYDmLwtkyYoPy6VQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-05-30 19:49             ` Arnd Bergmann
2014-05-30 19:49               ` Arnd Bergmann
2014-05-30 19:49               ` Arnd Bergmann
2014-06-02 10:41               ` Dave Martin
2014-06-02 10:41                 ` Dave Martin
2014-06-02 10:41                 ` Dave Martin
     [not found]                 ` <20140602104104.GD3855-M5GwZQ6tE7x5pKCnmE3YQBJ8xKzm50AiAL8bYrjMMd8@public.gmane.org>
2014-06-04 14:35                   ` Thierry Reding
2014-06-04 14:35                     ` Thierry Reding
2014-06-04 14:35                     ` Thierry Reding
2014-06-04 16:41                     ` Will Deacon
2014-06-04 16:41                       ` Will Deacon
2014-06-04 16:41                       ` Will Deacon
     [not found]                       ` <20140604164132.GF6644-5wv7dgnIgG8@public.gmane.org>
2014-06-04 21:00                         ` Thierry Reding
2014-06-04 21:00                           ` Thierry Reding
2014-06-04 21:00                           ` Thierry Reding
2014-06-05 19:10                       ` Varun Sethi
2014-06-05 19:10                         ` Varun Sethi
2014-06-05 19:10                         ` Varun Sethi
2014-06-16 15:27                         ` Will Deacon
2014-06-16 15:27                           ` Will Deacon
2014-06-16 15:27                           ` Will Deacon
     [not found]                           ` <20140616152739.GS16758-5wv7dgnIgG8@public.gmane.org>
2014-06-16 16:56                             ` Stuart Yoder
2014-06-16 16:56                               ` Stuart Yoder
2014-06-16 16:56                               ` Stuart Yoder
     [not found]                               ` <8b0492b4697943a0b1f276ef42cc8223-ufbTtyGzTTT8GZusEWM6WuO6mTEJWrR4XA4E9RH9d+qIuWR1G4zioA@public.gmane.org>
2014-06-16 17:04                                 ` Will Deacon
2014-06-16 17:04                                   ` Will Deacon
2014-06-16 17:04                                   ` Will Deacon
     [not found]                                   ` <20140616170416.GA16758-5wv7dgnIgG8@public.gmane.org>
2014-06-16 17:30                                     ` Arnd Bergmann
2014-06-16 17:30                                       ` Arnd Bergmann
2014-06-16 17:30                                       ` Arnd Bergmann
2014-06-16 18:53                                     ` Stuart Yoder
2014-06-16 18:53                                       ` Stuart Yoder
2014-06-16 18:53                                       ` Stuart Yoder
     [not found]                                       ` <419e67f783524d208ab3be16bcd94bd9-ufbTtyGzTTT8GZusEWM6WuO6mTEJWrR4XA4E9RH9d+qIuWR1G4zioA@public.gmane.org>
2014-06-17 10:26                                         ` Varun Sethi
2014-06-17 10:26                                           ` Varun Sethi
2014-06-17 10:26                                           ` Varun Sethi
     [not found]                                           ` <0587e1f4894546398be0798d2bc2c84f-AZ66ij2kwaacCcN9WK45f+O6mTEJWrR4XA4E9RH9d+qIuWR1G4zioA@public.gmane.org>
2014-06-17 10:43                                             ` Will Deacon
2014-06-17 10:43                                               ` Will Deacon
2014-06-17 10:43                                               ` Will Deacon
     [not found]                                               ` <20140617104304.GD13808-5wv7dgnIgG8@public.gmane.org>
2014-06-17 11:21                                                 ` Varun Sethi
2014-06-17 11:21                                                   ` Varun Sethi
2014-06-17 11:21                                                   ` Varun Sethi
     [not found]                                                   ` <32165315f0b84be9948f489fd87bf6a9-AZ66ij2kwaacCcN9WK45f+O6mTEJWrR4XA4E9RH9d+qIuWR1G4zioA@public.gmane.org>
2014-06-17 14:50                                                     ` Stuart Yoder
2014-06-17 14:50                                                       ` Stuart Yoder
2014-06-17 14:50                                                       ` Stuart Yoder
2014-06-18  9:29                                                       ` Will Deacon
2014-06-18  9:29                                                         ` Will Deacon
2014-06-18  9:29                                                         ` Will Deacon
2014-06-17 14:39                                           ` Stuart Yoder
2014-06-17 14:39                                             ` Stuart Yoder
2014-06-17 14:39                                             ` Stuart Yoder
2014-06-20 23:16         ` Olav Haugan
2014-06-20 23:16           ` Olav Haugan
2014-06-20 23:16           ` Olav Haugan
2014-06-24  9:18           ` Will Deacon
2014-06-24  9:18             ` Will Deacon
2014-06-24  9:18             ` Will Deacon
     [not found]             ` <20140624091808.GC26013-5wv7dgnIgG8@public.gmane.org>
2014-06-24 17:57               ` Olav Haugan
2014-06-24 17:57                 ` Olav Haugan
2014-06-24 17:57                 ` Olav Haugan
2014-06-24 18:11                 ` Will Deacon
2014-06-24 18:11                   ` Will Deacon
2014-06-24 18:11                   ` Will Deacon
     [not found]                   ` <20140624181150.GB4067-5wv7dgnIgG8@public.gmane.org>
2014-06-24 18:20                     ` Arnd Bergmann
2014-06-24 18:20                       ` Arnd Bergmann
2014-06-24 18:20                       ` Arnd Bergmann
2014-06-25  9:17                       ` Will Deacon
2014-06-25  9:17                         ` Will Deacon
2014-06-25  9:17                         ` Will Deacon
2014-06-25  9:27                         ` Arnd Bergmann
2014-06-25  9:27                           ` Arnd Bergmann
2014-06-25  9:27                           ` Arnd Bergmann
2014-06-25  9:38                           ` Will Deacon
2014-06-25  9:38                             ` Will Deacon
2014-06-25  9:38                             ` Will Deacon
2014-06-25  9:48                             ` Arnd Bergmann
2014-06-25  9:48                               ` Arnd Bergmann
2014-06-25  9:48                               ` Arnd Bergmann
2014-06-25  9:57                               ` Will Deacon
2014-06-25  9:57                                 ` Will Deacon
2014-06-25  9:57                                 ` Will Deacon
     [not found]                                 ` <20140625095735.GI6153-5wv7dgnIgG8@public.gmane.org>
2014-06-25 10:12                                   ` Arnd Bergmann
2014-06-25 10:12                                     ` Arnd Bergmann
2014-06-25 10:12                                     ` Arnd Bergmann
2014-06-25 10:14                                     ` Will Deacon
2014-06-25 10:14                                       ` Will Deacon
2014-06-25 10:14                                       ` Will Deacon
2014-06-24 21:35                     ` Olav Haugan
2014-06-24 21:35                       ` Olav Haugan
2014-06-24 21:35                       ` Olav Haugan
     [not found]                       ` <53A9EF3A.2070704-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2014-06-25  9:18                         ` Will Deacon
2014-06-25  9:18                           ` Will Deacon
2014-06-25  9:18                           ` Will Deacon
     [not found]                           ` <20140625091858.GG6153-5wv7dgnIgG8@public.gmane.org>
2014-06-27 22:23                             ` Olav Haugan
2014-06-27 22:23                               ` Olav Haugan
2014-06-27 22:23                               ` Olav Haugan
     [not found]                               ` <53ADEEDF.7060902-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2014-06-30  9:52                                 ` Will Deacon
2014-06-30  9:52                                   ` Will Deacon
2014-06-30  9:52                                   ` Will Deacon
2014-07-09  1:07                                   ` Olav Haugan
2014-07-09  1:07                                     ` Olav Haugan
2014-07-09  1:07                                     ` Olav Haugan
     [not found]                                     ` <53BC95DA.1010500-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2014-07-09 10:54                                       ` Will Deacon
2014-07-09 10:54                                         ` Will Deacon
2014-07-09 10:54                                         ` Will Deacon
     [not found]                                         ` <20140709105441.GE9485-5wv7dgnIgG8@public.gmane.org>
2014-07-10 22:32                                           ` Olav Haugan
2014-07-10 22:32                                             ` Olav Haugan
2014-07-10 22:32                                             ` Olav Haugan
2014-07-11 12:24                                             ` Will Deacon
2014-07-11 12:24                                               ` Will Deacon
2014-07-11 12:24                                               ` Will Deacon

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