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Andy Ross bd077561d0 kernel/swap: Add assertion to catch lock-breaking context switches
Our z_swap() API takes a key returned from arch_irq_lock() and
releases it atomically with the context switch.  Make sure that the
action of the unlocking is to unmask interrupts globally.  If
interrupts would still be masked then that means there is an OUTER
interrupt lock still held, and the code that locked it surely doesn't
expect the thread to be suspended and interrupts unmasked while it's
held!

Unfortunately, this kind of mistake is very easy to make.  We should
catch that with a simple assertion.  This is essentially a crude
Zephyr equivalent of the extremely common "BUG: scheduling while
atomic" error in Linux drivers (just google it).

The one exception made is the circumstance where a thread has already
aborted itself.  At that stage, whatever upthread lock state might
have existed will have already been messed up, so there's no value in
our asserting here.  We can't catch all bugs, and this can actually
happen in error handling and/or test frameworks.

Fixes #33319

Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
2021-05-17 15:27:37 -04:00
.buildkite ci: Reduce number of workers back to 20 2021-05-10 05:27:27 -05:00
.github actions: publish docs twice daily 2021-05-17 11:49:36 -04:00
arch arch/x86: Correct multiboot interpretation when building for EFI 2021-05-15 15:30:02 -04:00
boards boards: arm: lpc55s: Add missing trustzone flag 2021-05-17 08:04:07 -05:00
cmake cmake: cleanup version printing during CMake configure time 2021-05-07 20:50:02 -04:00
doc doc: remove tickless idle 2021-05-17 11:52:37 -04:00
drivers drivers: ethernet: stm32: enable IRQ at the end of iface init 2021-05-17 10:59:43 -04:00
dts dts: arm: stm32f{2,4,7}: fix device tree warning 2021-05-17 09:52:27 -05:00
include doc: fix doxygen grouping 2021-05-17 11:51:44 -04:00
kernel kernel/swap: Add assertion to catch lock-breaking context switches 2021-05-17 15:27:37 -04:00
lib libc: minimal: Add EOVERFLOW 2021-05-17 09:11:15 -04:00
misc toolchain: add GEN_ABSOLUTE_SYM_KCONFIG() 2021-02-02 09:23:45 -05:00
modules kconfig: TraceRecorder Kconfig file for undefined symbols 2021-05-11 13:00:05 -05:00
samples samples: net: gsm_modem: Add GSM mux compile test 2021-05-17 10:57:53 -04:00
scripts twister: fix hardware map generation 2021-05-17 11:47:50 -04:00
share cmake: using MD5_INFILE variable instead of ZephyrPackagePath.txt 2021-02-23 19:34:27 +01:00
soc ITE Keyboard scan: add registers for ITE keyboard scan driver 2021-05-17 15:24:11 -04:00
subsys doc: fix doxygen grouping 2021-05-17 11:51:44 -04:00
tests tests/kernel/fatal: Don't swap while locked 2021-05-17 15:27:37 -04:00
.checkpatch.conf checkpatch: ignore linux specific ENOSYS warning 2021-03-30 10:50:14 -05:00
.clang-format clang-format: Change lines length limit from 80 to 100 2021-05-06 08:13:32 -05:00
.codecov.yml
.editorconfig editorconfig: indent Kconfig files with tabs 2020-07-08 21:30:38 -04:00
.gitattributes
.gitignore gitignore: add common Python venv directories 2021-04-20 11:30:40 -05:00
.gitlint
.mailmap
.uncrustify.cfg
CMakeLists.txt cmake: rework empty zephyr libraries handling. 2021-05-06 18:06:32 +02:00
CODE_OF_CONDUCT.md
CODEOWNERS CODEOWNERS, MAINTAINERS.yml: Update github username 2021-05-11 12:59:25 -05:00
CONTRIBUTING.rst
Kconfig
Kconfig.zephyr linker: add bits for pinned regions 2021-05-10 16:00:43 -05:00
LICENSE
MAINTAINERS.yml ITE MAINTAINERS: add section for ITE 2021-05-17 09:14:33 -04:00
README.rst doc: remove references to shippable 2021-03-04 07:14:11 -06:00
VERSION release: Zephyr 2.6.0-rc1 2021-05-09 19:09:41 -05:00
version.h.in
west.yml west.yml: esp32: bugfixes and improvements 2021-05-13 22:03:39 -04:00
zephyr-env.cmd
zephyr-env.sh

.. raw:: html

   <a href="https://www.zephyrproject.org">
     <p align="center">
       <img src="doc/images/Zephyr-Project.png">
     </p>
   </a>

   <a href="https://bestpractices.coreinfrastructure.org/projects/74"><img
   src="https://bestpractices.coreinfrastructure.org/projects/74/badge"></a>
   <a href="https://buildkite.com/zephyr/zephyr">
   <img
   src="https://badge.buildkite.com/f5bd0dc88306cee17c9b38e78d11bb74a6291e3f40e7d13f31.svg?branch=master"></a>


The Zephyr Project is a scalable real-time operating system (RTOS) supporting
multiple hardware architectures, optimized for resource constrained devices,
and built with security in mind.

The Zephyr OS is based on a small-footprint kernel designed for use on
resource-constrained systems: from simple embedded environmental sensors and
LED wearables to sophisticated smart watches and IoT wireless gateways.

The Zephyr kernel supports multiple architectures, including ARM Cortex-M,
Intel x86, ARC, Nios II, Tensilica Xtensa, and RISC-V, and a large number of
`supported boards`_.

.. below included in doc/introduction/introduction.rst

.. start_include_here

Getting Started
***************

Welcome to Zephyr! See the `Introduction to Zephyr`_ for a high-level overview,
and the documentation's `Getting Started Guide`_ to start developing.

Community Support
*****************

Community support is provided via mailing lists and Slack; see the Resources
below for details.

.. _project-resources:

Resources
*********

Here's a quick summary of resources to help you find your way around:

* **Help**: `Asking for Help Tips`_
* **Documentation**: http://docs.zephyrproject.org (`Getting Started Guide`_)
* **Source Code**: https://github.com/zephyrproject-rtos/zephyr is the main
  repository; https://elixir.bootlin.com/zephyr/latest/source contains a
  searchable index
* **Releases**: https://github.com/zephyrproject-rtos/zephyr/releases
* **Samples and example code**: see `Sample and Demo Code Examples`_
* **Mailing Lists**: users@lists.zephyrproject.org and
  devel@lists.zephyrproject.org are the main user and developer mailing lists,
  respectively. You can join the developer's list and search its archives at
  `Zephyr Development mailing list`_. The other `Zephyr mailing list
  subgroups`_ have their own archives and sign-up pages.
* **Nightly CI Build Status**: https://lists.zephyrproject.org/g/builds
  The builds@lists.zephyrproject.org mailing list archives the CI
  (buildkite) nightly build results.
* **Chat**: Zephyr's Slack workspace is https://zephyrproject.slack.com.  Use
  this `Slack Invite`_ to register.
* **Contributing**: see the `Contribution Guide`_
* **Wiki**: `Zephyr GitHub wiki`_
* **Issues**: https://github.com/zephyrproject-rtos/zephyr/issues
* **Security Issues**: Email vulnerabilities@zephyrproject.org to report
  security issues; also see our `Security`_ documentation. Security issues are
  tracked separately at https://zephyrprojectsec.atlassian.net.
* **Zephyr Project Website**: https://zephyrproject.org

.. _Slack Invite: https://tinyurl.com/y5glwylp
.. _supported boards: http://docs.zephyrproject.org/latest/boards/index.html
.. _Zephyr Documentation: http://docs.zephyrproject.org
.. _Introduction to Zephyr: http://docs.zephyrproject.org/latest/introduction/index.html
.. _Getting Started Guide: http://docs.zephyrproject.org/latest/getting_started/index.html
.. _Contribution Guide: http://docs.zephyrproject.org/latest/contribute/index.html
.. _Zephyr GitHub wiki: https://github.com/zephyrproject-rtos/zephyr/wiki
.. _Zephyr Development mailing list: https://lists.zephyrproject.org/g/devel
.. _Zephyr mailing list subgroups: https://lists.zephyrproject.org/g/main/subgroups
.. _Sample and Demo Code Examples: http://docs.zephyrproject.org/latest/samples/index.html
.. _Security: http://docs.zephyrproject.org/latest/security/index.html
.. _Asking for Help Tips: https://docs.zephyrproject.org/latest/guides/getting-help.html