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From: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>
To: Tim Bird <tim.bird-mEdOJwZ7QcZBDgjK7y7TUQ@public.gmane.org>
Cc: Russell King - ARM Linux
	<linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org>,
	Stephen Warren <swarren-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>,
	Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>,
	Rob Herring <rob.herring-bsGFqQB8/DxBDgjK7y7TUQ@public.gmane.org>,
	"linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Olof Johansson <olof-nZhT3qVonbNeoWH0uzbU5w@public.gmane.org>,
	"linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org"
	<linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>
Subject: Re: [RFC PATCH 0/3] ARM: uncompress.h multi-platform enablement
Date: Wed, 26 Sep 2012 14:49:48 +0000	[thread overview]
Message-ID: <201209261449.48468.arnd@arndb.de> (raw)
In-Reply-To: <506315A6.3090300-mEdOJwZ7QcZBDgjK7y7TUQ@public.gmane.org>

On Wednesday 26 September 2012, Tim Bird wrote:
> My main issue is to avoid requiring the loading of
> drivers and features that are not required for a
> platform, if the platform does not need it (or the
> developer chooses to omit it).  I may have mis-read
> this thread, but it sounded like the uncompress
> code was going to be moved to a common area and
> not be configurable.

The suggestion was to move it into a different location, but you
still would only have one version of it, even for a multiplatform
kernel, so no code growth there.

Right now, a multiplatform kernel has no way of debugging the
decompressor using console output, so it's actually /smaller/
than a single-platform kernel, but also less capable.

Stephen's patches are a way to bring that feature back for
platforms that are converted to multiplatform, but such a kernel
would still only work on a single platform, even if it has
all the actual kernel code enabled to support others.

	Arnd

WARNING: multiple messages have this Message-ID (diff)
From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC PATCH 0/3] ARM: uncompress.h multi-platform enablement
Date: Wed, 26 Sep 2012 14:49:48 +0000	[thread overview]
Message-ID: <201209261449.48468.arnd@arndb.de> (raw)
In-Reply-To: <506315A6.3090300@am.sony.com>

On Wednesday 26 September 2012, Tim Bird wrote:
> My main issue is to avoid requiring the loading of
> drivers and features that are not required for a
> platform, if the platform does not need it (or the
> developer chooses to omit it).  I may have mis-read
> this thread, but it sounded like the uncompress
> code was going to be moved to a common area and
> not be configurable.

The suggestion was to move it into a different location, but you
still would only have one version of it, even for a multiplatform
kernel, so no code growth there.

Right now, a multiplatform kernel has no way of debugging the
decompressor using console output, so it's actually /smaller/
than a single-platform kernel, but also less capable.

Stephen's patches are a way to bring that feature back for
platforms that are converted to multiplatform, but such a kernel
would still only work on a single platform, even if it has
all the actual kernel code enabled to support others.

	Arnd

  parent reply	other threads:[~2012-09-26 14:49 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-09-25 22:46 [RFC PATCH 0/3] ARM: uncompress.h multi-platform enablement Stephen Warren
2012-09-25 22:46 ` Stephen Warren
     [not found] ` <1348613212-21897-1-git-send-email-swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-09-25 22:46   ` [RFC PATCH 1/3] ARM: move ICEDCC uncompress.h to common location Stephen Warren
2012-09-25 22:46     ` Stephen Warren
     [not found]     ` <1348613212-21897-2-git-send-email-swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-09-26 21:56       ` Domenico Andreoli
2012-09-26 21:56         ` Domenico Andreoli
2012-09-27  5:19         ` Stephen Warren
2012-09-27  5:19           ` Stephen Warren
2012-09-25 22:46   ` [RFC PATCH 2/3] ARM: mvebu: restore uncompress.h Stephen Warren
2012-09-25 22:46     ` Stephen Warren
2012-09-25 22:46   ` [RFC PATCH 3/3] ARM: tegra: move debug macros to include/debug Stephen Warren
2012-09-25 22:46     ` Stephen Warren
2012-09-26 10:38   ` [RFC PATCH 0/3] ARM: uncompress.h multi-platform enablement Arnd Bergmann
2012-09-26 10:38     ` Arnd Bergmann
     [not found]     ` <201209261038.36223.arnd-r2nGTMty4D4@public.gmane.org>
2012-09-26 10:44       ` Russell King - ARM Linux
2012-09-26 10:44         ` Russell King - ARM Linux
     [not found]         ` <20120926104421.GA7040-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
2012-09-26 12:05           ` Arnd Bergmann
2012-09-26 12:05             ` Arnd Bergmann
     [not found]             ` <201209261205.01351.arnd-r2nGTMty4D4@public.gmane.org>
2012-09-26 13:10               ` Domenico Andreoli
2012-09-26 13:10                 ` Domenico Andreoli
2012-09-26 13:48           ` Tim Bird
2012-09-26 13:48             ` Tim Bird
     [not found]             ` <506307A0.7010701-mEdOJwZ7QcZBDgjK7y7TUQ@public.gmane.org>
2012-09-26 14:17               ` Arnd Bergmann
2012-09-26 14:17                 ` Arnd Bergmann
     [not found]                 ` <201209261417.18883.arnd-r2nGTMty4D4@public.gmane.org>
2012-09-26 14:48                   ` Tim Bird
2012-09-26 14:48                     ` Tim Bird
     [not found]                     ` <506315A6.3090300-mEdOJwZ7QcZBDgjK7y7TUQ@public.gmane.org>
2012-09-26 14:49                       ` Arnd Bergmann [this message]
2012-09-26 14:49                         ` Arnd Bergmann
     [not found]                         ` <201209261449.48468.arnd-r2nGTMty4D4@public.gmane.org>
2012-09-26 15:10                           ` Russell King - ARM Linux
2012-09-26 15:10                             ` Russell King - ARM Linux
     [not found]                             ` <20120926151023.GC30938-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
2012-09-26 15:34                               ` Stephen Warren
2012-09-26 15:34                                 ` Stephen Warren
     [not found]                                 ` <50632096.7080208-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-09-28  3:53                                   ` Nicolas Pitre
2012-09-28  3:53                                     ` Nicolas Pitre
2012-09-27  5:37 ` Jean-Christophe PLAGNIOL-VILLARD
2012-09-27  5:37   ` Jean-Christophe PLAGNIOL-VILLARD

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