Minutes & actions: Kernel Working Group meeting of Dec 6, 2010

[Mounir Bsaibes]

Greetings,

Enclosed you'll find a link to the agenda, minutes and actions from the
Linaro kernel working group weekly meeting of  Dec 06, 2010.

https://wiki.linaro.org/WorkingGroups/KernelConsolidation/Meetings/2010-12-06


== Summary ==
 * Dave Martin & Nico reviewed K2.x blueprints, bp's are Approved now.
 * Tool to measure and fix SD card performance. Found a case of excessive
copy-and-paste, gaining unneeded abstraction layers not yet needed for this
non-ARM Unicore architecture.
 * Mainlined Flash support, available in git.stericsson.org, also taken into
the linux-arm-kernel tree 2.6.37.
 * Implemented USB transceiver driver as drivers/usb/otg.  Cleaning up MUSB
BSP for 8500 crossover code.  Gadget code sent out for internal ST-Ericsson
review, will post publicly after resolved.
 * Posted the five uboot patches to the list, built and tested the first two
on all available platforms.  Need additional testing, especially on
big-endian platforms such as PowerPC.
 * Reviewing status.  A few specifications and blueprints not yet complete,
status lagging on some.  Working on New Members wiki page.
 * ST-Ericsson Landing team going well.  Finding problems, getting fixes.
Waiting on some fixes from internal ST-Ericsson teams.  Currently relying on
to-be-written functionality.  Team is under NDA, so can pull some patches
from internal teams prior to upstreaming. Some issues with source-tree
organization within ST-Ericsson, which is being resolved by having a single
tree that functionality is added to via topic branches.
 * Thumb 2 work progressing.  A couple of patches to be merged into 2.6.36
tree. Freescale BSP review progress.
 * OMAP4-EHCI support queued up in linux-usb tree for 2.6.38
 * Document describing Linaro kernel, will publish on list and ask for
comments.
 *  Completed blocked-task-list reorganization for RCU_TREE priority
boosting, and started coding up changes needed to move from softirq to
kthread.
Possible RCU energy-consumption issue appearing on lightly loaded
systems with modest numbers of CPUs: RCU prevents entry into dyntick-idle
mode:  Examining possible approaches.


Please let me know if you have a question or comment,

Regards,
Mounir
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Ftrace on the CA9x4 vexpress

[Ken Werner]

Hi,

I did some quick ftrace tests using the linaro-vexpress 2.6.35-1010.17 kernel 
on an ARM-Versatile Express CA9x4 board. It seems to work pretty good. I 
noticed only one issue with the wakeup latency tracer where 
/sys/kernel/debug/tracing/trace doesn't show any real information but the 
/sys/kernel/debug/tracing/trace_pipe does.
The details can be found at: https://wiki.linaro.org/KenWerner/Sandbox/ftrace

Regards
Ken

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Linaro Foundations Team Weekly Report (2010-12-02 to 2010-12-08)

[Steve Langasek]

  The weekly report for the Linaro Foundations team may be found at:

Status report: https://wiki.linaro.org/Platform/Foundations/2010-12-08
Overall status (out of date until workitem tracker for 11.05 is available):
  https://wiki.linaro.org/Platform/Foundations/Status

 * A first 2.6.37 kernel is now packaged and available in Ubuntu natty for
   inclusion in Linaro images.
 * Cross-compiler packages have been merged and uploaded to natty, preparing
   us for gcc 4.5 as a default cross-compiler.
 * Progress on ALIP continues, with all but two of the original ALIP
   packages now successfully cross-buildable with patches applied.

Actions:

 * npitre to write up more formal documentation of what our kernel tree is
   (and isn't): DONE
 * slangasek to review armel-cross-toolchain-base merge request: DONE

-- 
Steve Langasek   Give me a lever long enough and a Free OS
Debian Developer   to set it on, and I can move the world.
Ubuntu Developerhttp://www.debian.org/
slanga...@ubuntu.com vor...@debian.org


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Linaro gcc ICE bug

[Khem Raj]

Hi

The bug http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46883 files
against GCC trunk also happens with linaro gcc 4.5
My guess is that there is a backported patch from trunk into linaro
4.5 tree thats causing this ICE

This ICE does not happen on upstream gcc-4.5 branch

I havent figured out the commit yet. Should you need a bug in linaro
bug tracker I will be happy to file one

Thanks
-Khem

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