It seems that the ordered primitives do need fixing, as dmart suggests;
for confirmation see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48126 .
I would also think that the ref()/deref() methods should have ordered
semantics, since they function like locks (a caller which sees deref()
return 0 is e
The patch in Ubuntu 11.04 is backported from upstream Qt4.8. If upstream is
mistaken, one of the persons who actually have a clue about the fine details of
ARMv7 memory barriers (not me) should educate upstream as was suggested in a
previous comment.
The Ubuntu bug tracker may be watched but un
The upstream commit looks at least semi-sane -- it looks like the memory
barrier stuff is merged in lp:ubuntu/qt4-x11, is my understanding
correct?
I also generally agree with upstream's view that they don't want to port
to the GCC primitives: since Qt already has a pretty decent atomics API,
and
If upstream is mistaken, please educate them, but we should get agreement in
principle before we commit to the change.
--
You received this bug notification because you are a member of Kubuntu
Bugs, which is subscribed to qt4-x11 in ubuntu.
https://bugs.launchpad.net/bugs/490371
Title:
Atomic
I believe that upstream is mistaken. It is not safe to allow other
memory accesses to be speculated into the ldrex/strex region, and (at
least on Cortex A9/A15) the only way to prevent that is to issue full
memory barriers before and after. Arguably the compiler should be
allowed to move memory a
Please see
https://bugs.launchpad.net/ubuntu/+source/qt4-x11/+bug/490371/comments/6 - I 'm
not sure if it relevant or not, but it sounds like upstream has some concerns.
--
You received this bug notification because you are a member of Kubuntu
Bugs, which is subscribed to qt4-x11 in ubuntu.
htt
Alternately, one could use the GCC intrinsics. They are more
conservative about memory barriers, which I believe to be more correct
in any case (it is not safe to let the compiler or the instruction
scheduler move memory accesses into the ldrex/strex critical region).
Other than memory barrier dif
Backported memory barrier changes from Qt master branch.
** Changed in: qt4-x11 (Ubuntu Natty)
Status: In Progress => Fix Released
--
You received this bug notification because you are a member of Kubuntu
Bugs, which is subscribed to qt4-x11 in ubuntu.
https://bugs.launchpad.net/bugs/4903
** Changed in: qt4-x11 (Ubuntu Natty)
Assignee: Canonical ARM (canonical-arm) => Jani Monoses (jani)
--
You received this bug notification because you are a member of Kubuntu
Bugs, which is subscribed to qt4-x11 in ubuntu.
https://bugs.launchpad.net/bugs/490371
Title:
Atomic operations no
** Changed in: qt4-x11 (Ubuntu Natty)
Milestone: natty-alpha-3 => ubuntu-11.04-beta-1
** Changed in: qt4-x11 (Ubuntu Natty)
Assignee: (unassigned) => Canonical ARM (canonical-arm)
--
You received this bug notification because you are a member of Kubuntu
Bugs, which is subscribed to qt4-
** Tags added: arm-porting-queue
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/490371
Title:
Atomic operations not safe for ARMv7,Thumb-2 and multicore
--
ubuntu-bugs mailing list
ubuntu-bugs@list
** Changed in: qt4-x11 (Ubuntu Natty)
Milestone: natty-alpha-2 => natty-alpha-3
--
You received this bug notification because you are a member of Kubuntu
Bugs, which is subscribed to qt4-x11 in ubuntu.
https://bugs.launchpad.net/bugs/490371
Title:
Atomic operations not safe for ARMv7,Thumb
Filed in the Qt issue tracker, but since LP does not recognize it here's the
link
http://bugreports.qt.nokia.com/browse/QTBUG-16402
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/490371
Title:
Atomi
** Changed in: qt4-x11 (Ubuntu Natty)
Milestone: natty-alpha-1 => natty-alpha-2
--
You received this bug notification because you are a member of Kubuntu
Bugs, which is subscribed to qt4-x11 in ubuntu.
https://bugs.launchpad.net/bugs/490371
Title:
Atomic operations not safe for ARMv7,Thumb
Provide Thumb2 support on armel - See LP Bug #673085 for details
Index: qt-everywhere-opensource-src-4.7.1/src/corelib/arch/qatomic_armv6.h
===
--- qt-everywhere-opensource-src-4.7.1.orig/src/corelib/arch/qatomic_armv6.h
2010-1
Scott,
Could you please also post the patch here?
--
You received this bug notification because you are a member of Kubuntu
Bugs, which is subscribed to qt4-x11 in ubuntu.
https://bugs.launchpad.net/bugs/490371
Title:
Atomic operations not safe for ARMv7,Thumb-2 and multicore
--
kubuntu-bugs
Please submit the patch upstream: http://bugreports.qt.nokia.com,
product Qt, component Threading.
--
You received this bug notification because you are a member of Kubuntu
Bugs, which is subscribed to qt4-x11 in ubuntu.
https://bugs.launchpad.net/bugs/490371
Title:
Atomic operations not safe
On Wednesday, December 08, 2010 01:57:49 am you wrote:
> It seems that "-Wa,-mimplicit-it=thumb" should be added to CXXFLAGS for
> armv7
No. We've a patch to add the explicit IT instructions so this isn't
needed.
--
You received this bug notification because you are a member of Kubuntu
Bugs, wh
It seems that "-Wa,-mimplicit-it=thumb" should be added to CXXFLAGS for
armv7
--
You received this bug notification because you are a member of Kubuntu
Bugs, which is subscribed to qt4-x11 in ubuntu.
https://bugs.launchpad.net/bugs/490371
Title:
Atomic operations not safe for ARMv7,Thumb-2 and
There's a patch for that in the Ubuntu qt4-x11 package in Natty. I don't
believe it's upstream yet.
--
You received this bug notification because you are a member of Kubuntu
Bugs, which is subscribed to qt4-x11 in ubuntu.
https://bugs.launchpad.net/bugs/490371
Title:
Atomic operations not sa
Hi Thiago,
I tried to compile Qt4.8 on armv7 platform locally, but meet following
new error message, do you have any suggestions?
make[1]: Entering directory `/home/jammy/qt/src/corelib'
g++ -c -include .pch/release-shared/QtCore -pipe -pthread
-I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include
** Changed in: qt4-x11 (Ubuntu)
Milestone: None => natty-alpha-1
** Also affects: qt4-x11 (Ubuntu Natty)
Importance: Medium
Status: In Progress
--
Atomic operations not safe for ARMv7,Thumb-2 and multicore
https://bugs.launchpad.net/bugs/490371
You received this bug notification be
** Tags added: thumb
--
Atomic operations not safe for ARMv7,Thumb-2 and multicore
https://bugs.launchpad.net/bugs/490371
You received this bug notification because you are a member of Kubuntu
Bugs, which is subscribed to qt4-x11 in ubuntu.
--
kubuntu-bugs mailing list
kubuntu-b...@lists.ubuntu
** Changed in: qt4-x11 (Ubuntu)
Assignee: Michael Casadevall (mcasadevall) => (unassigned)
--
Atomic operations not safe for ARMv7,Thumb-2 and multicore
https://bugs.launchpad.net/bugs/490371
You received this bug notification because you are a member of Kubuntu
Bugs, which is subscribed to
** Tags added: patch
--
Atomic operations not safe for ARMv7,Thumb-2 and multicore
https://bugs.launchpad.net/bugs/490371
You received this bug notification because you are a member of Kubuntu
Bugs, which is subscribed to qt4-x11 in ubuntu.
--
kubuntu-bugs mailing list
kubuntu-b...@lists.ubuntu
This patch adds memory barriers to the existing armv6-based atomics
implementation.
This is a quicker interim fix than porting the code to use the GCC
atomics, but that could still be addressed later.
The change is conservative: a barrier is added both before and after the
body of each atomic. T
** Changed in: qt4-x11 (Ubuntu)
Status: Triaged => In Progress
** Changed in: qt4-x11 (Ubuntu)
Assignee: (unassigned) => Michael Casadevall (mcasadevall)
--
Atomic operations not safe for ARMv7,Thumb-2 and multicore
https://bugs.launchpad.net/bugs/490371
You received this bug notific
from what i understand we need to make build system aware of v7 to
backout the armv6 workaround.
--
Atomic operations not safe for ARMv7,Thumb-2 and multicore
https://bugs.launchpad.net/bugs/490371
You received this bug notification because you are a member of Kubuntu
Bugs, which is subscribed to
The affected code still needs to be reviewed for SMP-safety, but this is
not high priority for lucid.
--
Atomic operations not safe for ARMv7,Thumb-2 and multicore
https://bugs.launchpad.net/bugs/490371
You received this bug notification because you are a member of Kubuntu
Bugs, which is subscrib
We fixed the armv6 configuration part of this bug a little while ago.
Changelog:
qt4-x11 (4:4.6.0-1ubuntu2) lucid; urgency=low
* Make libqt4-dev depend on libx11-dev
* In debian/rules Set DEB_HOST_ARCH and DEB_HOST_ARCH_OS. Configure with
"-arch armv6" option on ARM
-- Jonathan Riddell T
Setting this at medium for now, but this might be worth revisiting when
multicore chips become available if this proves to be causing big
problems.
** Changed in: qt4-x11 (Ubuntu)
Importance: Undecided => Medium
** Changed in: qt4-x11 (Ubuntu)
Status: New => Triaged
--
Atomic operatio
31 matches
Mail list logo
