ARM FCSE - random programs segfaults

[Martix]

Hi,
I've compiled latest 2.6.29-andy-tracking kernel with ARM Fast Context
Switch Extension patch [1], using gta02_moredrivers_defconfig kernel
config and CONFIG_ARM_FCSE=y and CONFIG_ARM_FCSE_BEST_EFFORT=y
options. I've tested this kernel with latest SHR-unstable. System with
FCSE enabled is really faster. However some (mostly Python)
applications randomly segfaults during loading[3]. But when
application loads properly, it runs rock stable[4].

Seems, it isn't related to 32 MB virtual memory limit and best effort
mode, because applications running above this limit runs properly.

I also tested FCSE on Qt Moko v16 with nodebug v17 kernel, but Qte
always restarts when loading desktop.

ARM FSCE support is already included in Android on FreeRunner
distributon kernel. I like to see this included also in Openmoko
distributions kernels, when will be stable and ready.

Regards,

Martin 'Martix' Holec

[1] http://gitorious.org/android-on-freerunner/kernel_openmoko/commit/1623424a807210d761b829253c93cbc45fd74dba?diffmode=inline
[2] http://git.openmoko.org/?p=kernel.git;a=commit;h=973a41fce60e5f6edfcf0eaf94056a57eee65e16
[3] http://disk.unart.cz/martix@openmoko.cz/strace.log
[4] http://disk.unart.cz/martix@openmoko.cz/strace2.log