[uml-devel] Re: [uml-user] SuSE 9.1 host + 2.4.26 Kernel + GCC 3.3.3 similarities to 2.6.6!?

["roland" <for_spam@gmx.de>]

hi!
> As well, I encountered the same memory problems -- it wouldn't recognize
> more than 32M!
> 
> Can anyone else confirm?  (Roland?)
i can at least confirm that 2.4 uml kernel has O1/O2 compile issues too -
got the same hang at "Init 3...." on suse9/9.1 as in 2.6.6.

afaik, these symptoms are known "compile issues":
- hang after "Checking for /proc/mm..." 
- hang after "Init...."
- command line options not being recognized (mem is no more than 32M,umid 
  not being recognized....)
- terminal being unusable after shutdown/halt - needs "reset"
- uml processes left running after shutdown/halt
- further...?

as -O2 Options break down  into:

-fforce-mem  -foptimize-sibling-calls  -fstrength-reduce 
-fcse-follow-jumps  -fcse-skip-blocks  -frerun-cse-after-loop 
-frerun-loop-opt -fgcse  -fgcse-lm  -fgcse-sm 
-fdelete-null-pointer-checks  -fexpensive-optimizations  -fregmov 
-fschedule-insns  -fschedule-insns2  -fsched-interblock  -fsched-spec 
-fcaller-saves  -fpeephole2  -freorder-blocks  -freorder-functions 
-fstrict-aliasing  -falign-functions  -falign-jumps  -falign-loops 
-falign-labels

just someone needs to dig into that, which of these optimizations result in a 
"corrupt" uml binary. maybe it's only one - maybe several ones.
does someone have a compile farm to "trial and error" this very quickly ? ;)

regards
roland


----- Original Message ----- 
From: "uml" <uml@dot1q.net>
To: "uml-user" <user-mode-linux-user@lists.sourceforge.net>
Sent: Sunday, June 06, 2004 7:15 PM
Subject: [uml-user] SuSE 9.1 host + 2.4.26 Kernel + GCC 3.3.3 similarities to 2.6.6!?


> For the sake of discussion/argument/curiosity, I decided to compile 2.4.26
> on SuSE9.1 with a slackware root_fs (9.1)...
> 
> Guess what I encountered that was similar to the 2.6.6 kernel compilation??
> 
> I had to replace every instance of -O2 with -O1 in order for it to run.  I
> am beginning to question the compiler rather than  UML now.  I'm using GCC
> 3.3.3 (default).
> 
> As well, I encountered the same memory problems -- it wouldn't recognize
> more than 32M!
> 
> Can anyone else confirm?  (Roland?)
> 
> The host is SMP, but UML is NOT compiled for SMP support.
> 
> Here's the total procedure I used:
> ---8<---
> #!/bin/sh
> cd /tmp
> wget http://www.kernel.org/pub/linux/kernel/v2.4/linux-2.4.26.tar.bz2
> wget
> http://umn.dl.sourceforge.net/sourceforge/user-mode-linux/uml-patch-2.4.26-1.bz2
> tar -xjvf linux-2.4.26.tar.bz2
> cd linux-2.4.26
> bzcat /tmp/uml-patch-2.4.26-1.bz2 | patch -p1
> make menuconfig ARCH=um  [turn on COW support -- but that's the only change
> from default!]
> perl -e 's/-O2/-O1/gi' -p -i.bak Makefile arch/um/Makefile
> make linux modules ARCH=um
> strip linux
> cp linux ../linux-2.4.26
> cd ..
> ./linux-2.4.26 ubd0=slack91.cow,slack91.img mem=128M eth0=tuntap,tap2
> umid=slack91test
> ---8<---
> 
> Without the 'perl -e 's/-O2/-O1/gi' -p -i.bak Makefile arch/um/Makefile'
> substitutions, it will compile, but I experience the same issues I do with
> 2.6.6.
> 
> Ideas?
> 
> 
> 
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