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Bug 134757 - UML does not start with CONFIG_VMSPLIT_3G_OPT
Summary: UML does not start with CONFIG_VMSPLIT_3G_OPT
Status: RESOLVED WONTFIX
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: Current packages (show other bugs)
Hardware: All Linux
: High minor (vote)
Assignee: Daniel Gryniewicz (RETIRED)
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2006-05-29 05:18 UTC by Toralf Förster
Modified: 2007-08-20 18:29 UTC (History)
1 user (show)

See Also:
Package list:
Runtime testing required: ---


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Description Toralf Förster gentoo-dev 2006-05-29 05:18:41 UTC
Hhm,

After compiling the current gentoo kernel with the following options:

n22 /usr/src/linux # grep -e "^CONFIG_VMSPLIT" -e "^CONFIG_PAGE_" .config.old
CONFIG_VMSPLIT_3G_OPT=y
CONFIG_PAGE_OFFSET=0xB0000000

I could not start my UML image, whereas

n22 /usr/src/linux # grep -e "^CONFIG_VMSPLIT" -e "^CONFIG_PAGE_" .config
CONFIG_VMSPLIT_3G=y
CONFIG_PAGE_OFFSET=0xC0000000

works.
(setting Severity to minor b/c Im not sure whether this is expected or a bug)
Comment 1 Daniel Gryniewicz (RETIRED) gentoo-dev 2006-05-29 10:58:06 UTC
I'm not particularly surprised it doesn't work, that option tends to break a lot of things.  However, I'm unable to find anything that claims it actually doesn't work.

Are you using usermode-sources for your UML kernel?  If not, could you try that?
Comment 2 Toralf Förster gentoo-dev 2006-05-29 12:01:38 UTC
I tried the following 4 versions for the UML kernel :

tfoerste@n22 ~/workspace $ l /usr/local/bin/linux-2.6.1*
/usr/local/bin/linux-2.6.15-usermode-r1  /usr/local/bin/linux-2.6.16-usermode
/usr/local/bin/linux-2.6.16-gentoo-r6    /usr/local/bin/linux-2.6.16-usermode-r1

Always the same behaviour, my host kernel is currently:
Linux n22 2.6.16-gentoo-r7 #6 Mon May 29 14:06:48 CEST 2006 i686 Intel(R) Pentium(R) M processor 1700MHz GNU/Linux

I reached this bug while changing my kernel options to better fit my system (1 GB RAM, so I decide to not use the 4GB or the 64 GB config option and in addition I tried a different 3GB/1GB spitting)
Comment 3 Daniel Gryniewicz (RETIRED) gentoo-dev 2006-05-30 13:04:22 UTC
I believe that the 3G OPT split doesn't work with UML.  UML has a special option to work eith 2G/2G, but not with any of the other optional splits.  This should probably be fixed upstream.