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From: Sergey Vlasov <vsu@altlinux.ru>
To: Jens Axboe <axboe@suse.de>
Cc: Byron Stanoszek <gandalf@winds.org>, Ingo Molnar <mingo@elte.hu>,
	linux-kernel@vger.kernel.org, Andrew Morton <akpm@osdl.org>,
	Linus Torvalds <torvalds@osdl.org>
Subject: Re: 2G memory split
Date: Tue, 10 Jan 2006 20:07:55 +0300	[thread overview]
Message-ID: <20060110200755.55ee8215.vsu@altlinux.ru> (raw)
In-Reply-To: <20060110143931.GM3389@suse.de>

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On Tue, 10 Jan 2006 15:39:31 +0100 Jens Axboe wrote:

> --- a/include/asm-i386/page.h
> +++ b/include/asm-i386/page.h
> @@ -109,11 +109,23 @@ extern int page_is_ram(unsigned long pag
>  
>  #endif /* __ASSEMBLY__ */
>  
> +#if defined(CONFIG_DEFAULT_3G)
> +#define __PAGE_OFFSET_RAW	(0xC0000000)
> +#elif defined(CONFIG_DEFAULT_3G_OPT)
> +#define	__PAGE_OFFSET_RAW	(0xB0000000)
> +#elif defined(CONFIG_DEFAULT_2G)
> +#define __PAGE_OFFSET_RAW	(0x78000000)
> +#elif defined(CONFIG_DEFAULT_1G)
> +#define __PAGE_OFFSET_RAW	(0x40000000)
> +#else
> +#error "Bad user/kernel offset"
> +#endif
> +
>  #ifdef __ASSEMBLY__
> -#define __PAGE_OFFSET		(0xC0000000)
> +#define __PAGE_OFFSET		__PAGE_OFFSET_RAW
>  #define __PHYSICAL_START	CONFIG_PHYSICAL_START
>  #else
> -#define __PAGE_OFFSET		(0xC0000000UL)
> +#define __PAGE_OFFSET		((unsigned long)__PAGE_OFFSET_RAW)
>  #define __PHYSICAL_START	((unsigned long)CONFIG_PHYSICAL_START)
>  #endif
>  #define __KERNEL_START		(__PAGE_OFFSET + __PHYSICAL_START)

Changing PAGE_OFFSET this way would break at least Valgrind (the latest
release 3.1.0 by default is statically linked at address 0xb0000000, and
PIE support does not seem to be present in that release).  I remember
that similar changes were also breaking Lisp implementations (cmucl,
sbcl), however, I am not really sure about this.

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  parent reply	other threads:[~2006-01-10 17:08 UTC|newest]

Thread overview: 87+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-01-10 12:58 2G memory split Jens Axboe
2006-01-10 13:29 ` Ingo Molnar
2006-01-10 13:37   ` Jens Axboe
2006-01-10 13:43     ` Byron Stanoszek
2006-01-10 13:47       ` Jens Axboe
2006-01-10 14:39       ` Jens Axboe
2006-01-10 14:44         ` Ingo Molnar
2006-01-10 15:03           ` [PATCH] Address space split configuration Jens Axboe
2006-01-10 15:11             ` Mark Lord
2006-01-10 15:24             ` Mikael Pettersson
2006-01-10 16:14         ` 2G memory split Linus Torvalds
2006-01-10 16:40           ` Mark Lord
2006-01-10 16:52             ` Linus Torvalds
2006-01-10 18:33               ` Coywolf Qi Hunt
2006-01-10 17:07           ` Mark Lord
2006-01-10 17:28             ` Linus Torvalds
2006-01-10 17:32             ` Jens Axboe
2006-01-10 17:37               ` Mark Lord
2006-01-10 18:58                 ` Mark Lord
2006-01-10 19:16                   ` [PATCH ] VMSPLIT config options (with default config fixed) Mark Lord
2006-01-10 17:37                     ` Jeff V. Merkey
2006-01-10 19:27                     ` Jens Axboe
2006-01-11  1:13                     ` J.A. Magallon
2006-01-11 10:15                       ` Jens Axboe
2006-01-11 16:00                     ` Greg Norris
2006-01-11 17:13                       ` Mark Lord
2006-01-11 17:44                         ` Greg Norris
2006-02-05 18:42                         ` Barry K. Nathan
2006-02-01 22:23                     ` Herbert Poetzl
2006-02-02 11:04                       ` Ulrich Mueller
2006-02-02 20:55                         ` Jan Engelhardt
2006-02-03 22:39                           ` Mark Lord
2006-02-04 10:23                             ` Ulrich Mueller
2006-02-04 11:06                               ` Jan Engelhardt
2006-02-04 10:36                             ` Jens Axboe
2006-02-04 11:05                             ` Jan Engelhardt
2006-02-04 13:57                               ` Mark Lord
2006-02-05 15:32                                 ` J.A. Magallon
2006-02-05 15:38                               ` Arjan van de Ven
2006-02-05 21:14                                 ` Jan Engelhardt
2006-02-05 21:19                                   ` Arjan van de Ven
2006-02-06 14:56                                     ` Jan Engelhardt
2006-02-07  0:41                                       ` Herbert Poetzl
2006-02-07  2:51                                         ` Mark Rustad
2006-02-07  9:38                                         ` Bernd Petrovitsch
2006-02-07 12:19                                           ` RFC: add an ADVANCED_USER option Adrian Bunk
2006-02-07 14:05                                             ` Ulrich Mueller
2006-02-07 14:42                                               ` Adrian Bunk
2006-02-09 16:06                                                 ` Jan Engelhardt
2006-01-10 17:48             ` 2G memory split Bernd Eckenfels
2006-01-10 16:30               ` [PATCH] " Jeff V. Merkey
2006-01-10 18:50                 ` Lennart Sorensen
2006-01-10 17:13                   ` Jeff V. Merkey
2006-01-10 19:42               ` Jens Axboe
2006-01-10 20:17                 ` Bernd Eckenfels
2006-01-10 20:28                   ` Jens Axboe
2006-01-11  8:39                     ` Bernd Eckenfels
2006-01-11 10:06                       ` Jens Axboe
2006-01-10 18:14           ` Martin Bligh
2006-01-10 18:34             ` Linus Torvalds
2006-01-10 16:56               ` Jeff V. Merkey
2006-01-10 17:01                 ` Jeff V. Merkey
2006-01-10 18:45                 ` Mark Lord
2006-01-10 18:46                 ` Martin Bligh
2006-01-10 18:58                 ` Jens Axboe
2006-01-10 17:17                   ` Jeff V. Merkey
2006-01-10 20:55                 ` Alan Cox
2006-01-10 19:12                   ` Jeff V. Merkey
2006-01-10 21:02                     ` Jens Axboe
2006-01-10 19:30                       ` Jeff V. Merkey
2006-01-10 18:39               ` Martin Bligh
2006-01-10 18:55               ` Dave Hansen
2006-01-10 19:01                 ` Mark Lord
2006-01-10 19:05                   ` Dave Hansen
2006-01-10 17:07         ` Sergey Vlasov [this message]
2006-04-10 14:11           ` Kirill Korotaev
2006-04-10 14:39             ` Mark Lord
2006-01-10 18:28         ` Coywolf Qi Hunt
2006-01-10 13:47 ` Mikael Pettersson
2006-01-10 13:54   ` Jens Axboe
2006-01-10 14:09     ` Gerd Hoffmann
2006-01-10 14:21       ` Jens Axboe
2006-01-10 14:25       ` Jens Axboe
2006-01-10 20:42   ` Jan Engelhardt
2006-01-11  0:25     ` Con Kolivas
2006-01-10 14:12 ` Mark Lord
2006-01-10 14:22   ` Jens Axboe

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