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From: Thomas Zimmermann <tzimmermann@suse.de>
To: Sam Ravnborg <sam@ravnborg.org>
Cc: daniel@ffwll.ch, airlied@linux.ie, alexander.deucher@amd.com,
	christian.koenig@amd.com, liviu.dudau@arm.com,
	brian.starkey@arm.com, bbrezillon@kernel.org,
	nicolas.ferre@microchip.com, maarten.lankhorst@linux.intel.com,
	mripard@kernel.org, stefan@agner.ch, alison.wang@nxp.com,
	patrik.r.jakobsson@gmail.com, anitha.chrisanthus@intel.com,
	robdclark@gmail.com, edmund.j.dea@intel.com, sean@poorly.run,
	shawnguo@kernel.org, s.hauer@pengutronix.de,
	kernel@pengutronix.de, jyri.sarha@iki.fi, tomba@kernel.org,
	linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org,
	amd-gfx@lists.freedesktop.org, freedreno@lists.freedesktop.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 00/14] drm: Make DRM's IRQ helpers legacy
Date: Wed, 28 Jul 2021 07:19:17 +0200	[thread overview]
Message-ID: <d11b4688-b05e-8936-50dc-22eee9dd2983@suse.de> (raw)
In-Reply-To: <YQBVyuPuf9InsY7g@ravnborg.org>


[-- Attachment #1.1: Type: text/plain, Size: 1717 bytes --]

Hi Sam

Am 27.07.21 um 20:51 schrieb Sam Ravnborg:
> Hi Thomas,
> 
> On Tue, Jul 27, 2021 at 08:27:07PM +0200, Thomas Zimmermann wrote:
>> DRM's IRQ helpers are only helpful for old, non-KMS drivers. Move
>> the code behind CONFIG_DRM_LEGACY. Convert KMS drivers to Linux
>> IRQ interfaces.
>>
>> DRM provides IRQ helpers for setting up, receiving and removing IRQ
>> handlers. It's an abstraction over plain Linux functions. The code
>> is mid-layerish with several callbacks to hook into the rsp drivers.
>> Old UMS driver have their interrupts enabled via ioctl, so these
>> abstractions makes some sense. Modern KMS manage all their interrupts
>> internally. Using the DRM helpers adds indirection without benefits.
>>
>> Most KMs drivers already use Linux IRQ functions instead of DRM's
>> abstraction layer. Patches 1 to 12 convert the remaining ones.
>> The patches also resolve a bug for devices without assigned interrupt
>> number. DRM helpers don't test for IRQ_NOTCONNECTED, so drivers do
>> not detect if the device has no interrupt assigned.
> 
> Before diving into a review of these..
> Any specific reason devm_request_irq is not used?

Thanks for looking at the patches.

Switching to devm_ definately makes sense in the longer term.
  I didn't do this here to not change the order of clean-up operations 
in general. And some of the drivers have dedicated IRQ clean-up code, 
which might depend on the correct order as well.

Best regards
Thomas

> 
> 	Sam
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer


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WARNING: multiple messages have this Message-ID (diff)
From: Thomas Zimmermann <tzimmermann@suse.de>
To: Sam Ravnborg <sam@ravnborg.org>
Cc: airlied@linux.ie, liviu.dudau@arm.com, stefan@agner.ch,
	amd-gfx@lists.freedesktop.org, anitha.chrisanthus@intel.com,
	patrik.r.jakobsson@gmail.com, linux-arm-msm@vger.kernel.org,
	freedreno@lists.freedesktop.org, daniel@ffwll.ch,
	edmund.j.dea@intel.com, s.hauer@pengutronix.de,
	alison.wang@nxp.com, maarten.lankhorst@linux.intel.com,
	mripard@kernel.org, dri-devel@lists.freedesktop.org,
	sean@poorly.run, linux-arm-kernel@lists.infradead.org,
	tomba@kernel.org, bbrezillon@kernel.org, jyri.sarha@iki.fi,
	christian.koenig@amd.com, robdclark@gmail.com,
	kernel@pengutronix.de, alexander.deucher@amd.com,
	shawnguo@kernel.org, brian.starkey@arm.com
Subject: Re: [PATCH 00/14] drm: Make DRM's IRQ helpers legacy
Date: Wed, 28 Jul 2021 07:19:17 +0200	[thread overview]
Message-ID: <d11b4688-b05e-8936-50dc-22eee9dd2983@suse.de> (raw)
In-Reply-To: <YQBVyuPuf9InsY7g@ravnborg.org>


[-- Attachment #1.1.1: Type: text/plain, Size: 1717 bytes --]

Hi Sam

Am 27.07.21 um 20:51 schrieb Sam Ravnborg:
> Hi Thomas,
> 
> On Tue, Jul 27, 2021 at 08:27:07PM +0200, Thomas Zimmermann wrote:
>> DRM's IRQ helpers are only helpful for old, non-KMS drivers. Move
>> the code behind CONFIG_DRM_LEGACY. Convert KMS drivers to Linux
>> IRQ interfaces.
>>
>> DRM provides IRQ helpers for setting up, receiving and removing IRQ
>> handlers. It's an abstraction over plain Linux functions. The code
>> is mid-layerish with several callbacks to hook into the rsp drivers.
>> Old UMS driver have their interrupts enabled via ioctl, so these
>> abstractions makes some sense. Modern KMS manage all their interrupts
>> internally. Using the DRM helpers adds indirection without benefits.
>>
>> Most KMs drivers already use Linux IRQ functions instead of DRM's
>> abstraction layer. Patches 1 to 12 convert the remaining ones.
>> The patches also resolve a bug for devices without assigned interrupt
>> number. DRM helpers don't test for IRQ_NOTCONNECTED, so drivers do
>> not detect if the device has no interrupt assigned.
> 
> Before diving into a review of these..
> Any specific reason devm_request_irq is not used?

Thanks for looking at the patches.

Switching to devm_ definately makes sense in the longer term.
  I didn't do this here to not change the order of clean-up operations 
in general. And some of the drivers have dedicated IRQ clean-up code, 
which might depend on the correct order as well.

Best regards
Thomas

> 
> 	Sam
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer


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_______________________________________________
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: Thomas Zimmermann <tzimmermann@suse.de>
To: Sam Ravnborg <sam@ravnborg.org>
Cc: airlied@linux.ie, liviu.dudau@arm.com,
	amd-gfx@lists.freedesktop.org, anitha.chrisanthus@intel.com,
	linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org,
	edmund.j.dea@intel.com, s.hauer@pengutronix.de,
	alison.wang@nxp.com, dri-devel@lists.freedesktop.org,
	sean@poorly.run, linux-arm-kernel@lists.infradead.org,
	tomba@kernel.org, bbrezillon@kernel.org, jyri.sarha@iki.fi,
	nicolas.ferre@microchip.com, christian.koenig@amd.com,
	kernel@pengutronix.de, alexander.deucher@amd.com,
	shawnguo@kernel.org
Subject: Re: [PATCH 00/14] drm: Make DRM's IRQ helpers legacy
Date: Wed, 28 Jul 2021 07:19:17 +0200	[thread overview]
Message-ID: <d11b4688-b05e-8936-50dc-22eee9dd2983@suse.de> (raw)
In-Reply-To: <YQBVyuPuf9InsY7g@ravnborg.org>


[-- Attachment #1.1: Type: text/plain, Size: 1717 bytes --]

Hi Sam

Am 27.07.21 um 20:51 schrieb Sam Ravnborg:
> Hi Thomas,
> 
> On Tue, Jul 27, 2021 at 08:27:07PM +0200, Thomas Zimmermann wrote:
>> DRM's IRQ helpers are only helpful for old, non-KMS drivers. Move
>> the code behind CONFIG_DRM_LEGACY. Convert KMS drivers to Linux
>> IRQ interfaces.
>>
>> DRM provides IRQ helpers for setting up, receiving and removing IRQ
>> handlers. It's an abstraction over plain Linux functions. The code
>> is mid-layerish with several callbacks to hook into the rsp drivers.
>> Old UMS driver have their interrupts enabled via ioctl, so these
>> abstractions makes some sense. Modern KMS manage all their interrupts
>> internally. Using the DRM helpers adds indirection without benefits.
>>
>> Most KMs drivers already use Linux IRQ functions instead of DRM's
>> abstraction layer. Patches 1 to 12 convert the remaining ones.
>> The patches also resolve a bug for devices without assigned interrupt
>> number. DRM helpers don't test for IRQ_NOTCONNECTED, so drivers do
>> not detect if the device has no interrupt assigned.
> 
> Before diving into a review of these..
> Any specific reason devm_request_irq is not used?

Thanks for looking at the patches.

Switching to devm_ definately makes sense in the longer term.
  I didn't do this here to not change the order of clean-up operations 
in general. And some of the drivers have dedicated IRQ clean-up code, 
which might depend on the correct order as well.

Best regards
Thomas

> 
> 	Sam
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer


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WARNING: multiple messages have this Message-ID (diff)
From: Thomas Zimmermann <tzimmermann@suse.de>
To: Sam Ravnborg <sam@ravnborg.org>
Cc: airlied@linux.ie, liviu.dudau@arm.com, stefan@agner.ch,
	amd-gfx@lists.freedesktop.org, anitha.chrisanthus@intel.com,
	patrik.r.jakobsson@gmail.com, linux-arm-msm@vger.kernel.org,
	freedreno@lists.freedesktop.org, daniel@ffwll.ch,
	edmund.j.dea@intel.com, s.hauer@pengutronix.de,
	alison.wang@nxp.com, maarten.lankhorst@linux.intel.com,
	mripard@kernel.org, dri-devel@lists.freedesktop.org,
	sean@poorly.run, linux-arm-kernel@lists.infradead.org,
	tomba@kernel.org, bbrezillon@kernel.org, jyri.sarha@iki.fi,
	nicolas.ferre@microchip.com, christian.koenig@amd.com,
	robdclark@gmail.com, kernel@pengutronix.de,
	alexander.deucher@amd.com, shawnguo@kernel.org,
	brian.starkey@arm.com
Subject: Re: [PATCH 00/14] drm: Make DRM's IRQ helpers legacy
Date: Wed, 28 Jul 2021 07:19:17 +0200	[thread overview]
Message-ID: <d11b4688-b05e-8936-50dc-22eee9dd2983@suse.de> (raw)
In-Reply-To: <YQBVyuPuf9InsY7g@ravnborg.org>


[-- Attachment #1.1.1: Type: text/plain, Size: 1717 bytes --]

Hi Sam

Am 27.07.21 um 20:51 schrieb Sam Ravnborg:
> Hi Thomas,
> 
> On Tue, Jul 27, 2021 at 08:27:07PM +0200, Thomas Zimmermann wrote:
>> DRM's IRQ helpers are only helpful for old, non-KMS drivers. Move
>> the code behind CONFIG_DRM_LEGACY. Convert KMS drivers to Linux
>> IRQ interfaces.
>>
>> DRM provides IRQ helpers for setting up, receiving and removing IRQ
>> handlers. It's an abstraction over plain Linux functions. The code
>> is mid-layerish with several callbacks to hook into the rsp drivers.
>> Old UMS driver have their interrupts enabled via ioctl, so these
>> abstractions makes some sense. Modern KMS manage all their interrupts
>> internally. Using the DRM helpers adds indirection without benefits.
>>
>> Most KMs drivers already use Linux IRQ functions instead of DRM's
>> abstraction layer. Patches 1 to 12 convert the remaining ones.
>> The patches also resolve a bug for devices without assigned interrupt
>> number. DRM helpers don't test for IRQ_NOTCONNECTED, so drivers do
>> not detect if the device has no interrupt assigned.
> 
> Before diving into a review of these..
> Any specific reason devm_request_irq is not used?

Thanks for looking at the patches.

Switching to devm_ definately makes sense in the longer term.
  I didn't do this here to not change the order of clean-up operations 
in general. And some of the drivers have dedicated IRQ clean-up code, 
which might depend on the correct order as well.

Best regards
Thomas

> 
> 	Sam
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer


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_______________________________________________
amd-gfx mailing list
amd-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/amd-gfx

  reply	other threads:[~2021-07-28  5:19 UTC|newest]

Thread overview: 172+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-27 18:27 [PATCH 00/14] drm: Make DRM's IRQ helpers legacy Thomas Zimmermann
2021-07-27 18:27 ` Thomas Zimmermann
2021-07-27 18:27 ` Thomas Zimmermann
2021-07-27 18:27 ` Thomas Zimmermann
2021-07-27 18:27 ` [PATCH 01/14] drm/amdgpu: Convert to Linux IRQ interfaces Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-28 10:27   ` Christian König
2021-07-28 10:27     ` Christian König
2021-07-28 10:27     ` Christian König
2021-07-28 10:27     ` Christian König
2021-07-28 14:03     ` Alex Deucher
2021-07-28 14:03       ` Alex Deucher
2021-07-28 14:03       ` Alex Deucher
2021-07-28 14:03       ` Alex Deucher
2021-08-02  8:43       ` Thomas Zimmermann
2021-08-02  8:43         ` Thomas Zimmermann
2021-08-02  8:43         ` Thomas Zimmermann
2021-07-27 18:27 ` [PATCH 02/14] drm/arm/hdlcd: " Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-28 13:31   ` Sam Ravnborg
2021-07-28 13:31     ` Sam Ravnborg
2021-07-28 13:31     ` Sam Ravnborg
2021-07-28 18:15     ` Thomas Zimmermann
2021-07-28 18:15       ` Thomas Zimmermann
2021-07-28 18:15       ` Thomas Zimmermann
2021-07-28 18:15       ` Thomas Zimmermann
2021-07-27 18:27 ` [PATCH 03/14] drm/atmel-hlcdc: " Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-28 14:00   ` Sam Ravnborg
2021-07-28 14:00     ` Sam Ravnborg
2021-07-28 14:00     ` Sam Ravnborg
2021-07-28 15:11     ` Dan.Sneddon
2021-07-28 15:11       ` Dan.Sneddon
2021-07-28 15:11       ` Dan.Sneddon
2021-07-28 15:11       ` Dan.Sneddon
2021-07-28 15:44       ` Sam Ravnborg
2021-07-28 15:44         ` Sam Ravnborg
2021-07-28 15:44         ` Sam Ravnborg
2021-07-28 17:50         ` Dan.Sneddon
2021-07-28 17:50           ` Dan.Sneddon
2021-07-28 17:50           ` Dan.Sneddon
2021-07-28 17:50           ` Dan.Sneddon
2021-07-28 18:11           ` Sam Ravnborg
2021-07-28 18:11             ` Sam Ravnborg
2021-07-28 18:11             ` Sam Ravnborg
2021-07-28 18:17             ` Thomas Zimmermann
2021-07-28 18:17               ` Thomas Zimmermann
2021-07-28 18:17               ` Thomas Zimmermann
2021-07-28 18:17               ` Thomas Zimmermann
2021-07-28 18:46               ` Dan.Sneddon
2021-07-28 18:46                 ` Dan.Sneddon
2021-07-28 18:46                 ` Dan.Sneddon
2021-07-28 18:46                 ` Dan.Sneddon
2021-07-28 19:08                 ` Sam Ravnborg
2021-07-28 19:08                   ` Sam Ravnborg
2021-07-28 19:08                   ` Sam Ravnborg
2021-07-28 19:19                   ` Dan.Sneddon
2021-07-28 19:19                     ` Dan.Sneddon
2021-07-28 19:19                     ` Dan.Sneddon
2021-07-28 19:19                     ` Dan.Sneddon
2021-07-28 20:11                     ` Sam Ravnborg
2021-07-28 20:11                       ` Sam Ravnborg
2021-07-28 20:11                       ` Sam Ravnborg
2021-07-29 19:18                       ` Thomas Zimmermann
2021-07-29 19:18                         ` Thomas Zimmermann
2021-07-29 19:18                         ` Thomas Zimmermann
2021-07-29 19:18                         ` Thomas Zimmermann
2021-07-29 19:21                         ` Thomas Zimmermann
2021-07-29 19:21                           ` Thomas Zimmermann
2021-07-29 19:21                           ` Thomas Zimmermann
2021-07-29 19:21                           ` Thomas Zimmermann
2021-07-29 19:24                         ` Dan.Sneddon
2021-07-29 19:24                           ` Dan.Sneddon
2021-07-29 19:24                           ` Dan.Sneddon
2021-07-29 19:24                           ` Dan.Sneddon
2021-07-29 19:32                           ` Thomas Zimmermann
2021-07-29 19:32                             ` Thomas Zimmermann
2021-07-29 19:32                             ` Thomas Zimmermann
2021-07-29 19:32                             ` Thomas Zimmermann
2021-07-29 19:48                         ` Sam Ravnborg
2021-07-29 19:48                           ` Sam Ravnborg
2021-07-29 19:48                           ` Sam Ravnborg
2021-07-29 19:55                           ` Dan.Sneddon
2021-07-29 19:55                             ` Dan.Sneddon
2021-07-29 19:55                             ` Dan.Sneddon
2021-07-29 19:55                             ` Dan.Sneddon
2021-07-30  8:31                             ` Thomas Zimmermann
2021-07-30  8:31                               ` Thomas Zimmermann
2021-07-30  8:31                               ` Thomas Zimmermann
2021-07-30  8:31                               ` Thomas Zimmermann
2021-07-30 18:10                               ` Dan.Sneddon
2021-07-30 18:10                                 ` Dan.Sneddon
2021-07-30 18:10                                 ` Dan.Sneddon
2021-07-28 18:19             ` Dan.Sneddon
2021-07-28 18:19               ` Dan.Sneddon
2021-07-28 18:19               ` Dan.Sneddon
2021-07-28 18:19               ` Dan.Sneddon
2021-07-27 18:27 ` [PATCH 04/14] drm/fsl-dcu: " Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27 ` [PATCH 05/14] drm/gma500: " Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27 ` [PATCH 06/14] drm/kmb: " Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27 ` [PATCH 07/14] drm/msm: " Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27 ` [PATCH 08/14] drm/mxsfb: " Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27 ` [PATCH 09/14] drm/radeon: " Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-08-02 15:27   ` Alex Deucher
2021-08-02 15:27     ` Alex Deucher
2021-08-02 15:27     ` Alex Deucher
2021-07-27 18:27 ` [PATCH 10/14] drm/tidss: " Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-29  7:02   ` Tomi Valkeinen
2021-07-29  7:02     ` Tomi Valkeinen
2021-07-29  7:02     ` Tomi Valkeinen
2021-07-29  7:02     ` Tomi Valkeinen
2021-07-27 18:27 ` [PATCH 11/14] drm/tilcdc: " Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27 ` [PATCH 12/14] drm/vc4: " Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27 ` [PATCH 13/14] drm: Remove unused devm_drm_irq_install() Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27 ` [PATCH 14/14] drm: IRQ midlayer is now legacy Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-27 18:27   ` Thomas Zimmermann
2021-07-28 14:10   ` Sam Ravnborg
2021-07-28 14:10     ` Sam Ravnborg
2021-07-28 14:10     ` Sam Ravnborg
2021-07-27 18:51 ` [PATCH 00/14] drm: Make DRM's IRQ helpers legacy Sam Ravnborg
2021-07-27 18:51   ` Sam Ravnborg
2021-07-27 18:51   ` Sam Ravnborg
2021-07-28  5:19   ` Thomas Zimmermann [this message]
2021-07-28  5:19     ` Thomas Zimmermann
2021-07-28  5:19     ` Thomas Zimmermann
2021-07-28  5:19     ` Thomas Zimmermann
2021-07-31 18:50 ` Sam Ravnborg
2021-07-31 18:50   ` Sam Ravnborg
2021-08-01 19:56   ` Thomas Zimmermann
2021-08-01 19:56     ` Thomas Zimmermann
2021-08-01 20:24     ` Sam Ravnborg
2021-08-01 20:24       ` Sam Ravnborg
2021-08-02  8:42       ` Thomas Zimmermann
2021-08-02  8:42         ` Thomas Zimmermann

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