[GIT PULL kcsan] KCSAN commits for v5.8

[GIT PULL kcsan] KCSAN commits for v5.8

[Paul E. McKenney]

Hello!

This pull request contains KCSAN updates for v5.8.  These have been
subject to LKML review:

https://lore.kernel.org/lkml/20200415183343.GA12265@paulmck-ThinkPad-P72
https://lore.kernel.org/lkml/20200417025837.49780-1-weiyongjun1@huawei.com
https://lore.kernel.org/lkml/20200401101714.44781-1-elver@google.com
https://lore.kernel.org/lkml/20200424154730.190041-1-elver@google.com
https://lore.kernel.org/lkml/20200424154730.190041-2-elver@google.com

All of these have also been subjected to the kbuild test robot and
-next testing.  The following changes since commit f5d2313bd3c5:

  kcsan, trace: Make KCSAN compatible with tracing (2020-03-21 09:44:41 +0100)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git kcsan-for-tip

for you to fetch changes up to 50a19ad4b1ec531eb550183cb5d4ab9f25a56bf8:

  objtool, kcsan: Add kcsan_disable_current() and kcsan_enable_current_nowarn() (2020-05-06 13:47:06 -0700)

----------------------------------------------------------------
Ingo Molnar (1):
      Improve KCSAN documentation a bit

Marco Elver (17):
      kcsan: Add option to allow watcher interruptions
      kcsan: Add option for verbose reporting
      kcsan: Add current->state to implicitly atomic accesses
      kcsan: Update Documentation/dev-tools/kcsan.rst
      kcsan: Update API documentation in kcsan-checks.h
      kcsan: Introduce report access_info and other_info
      kcsan: Avoid blocking producers in prepare_report()
      kcsan: Add support for scoped accesses
      objtool, kcsan: Add explicit check functions to uaccess whitelist
      kcsan: Introduce scoped ASSERT_EXCLUSIVE macros
      kcsan: Move kcsan_{disable,enable}_current() to kcsan-checks.h
      kcsan: Change data_race() to no longer require marking racing accesses
      kcsan: Fix function matching in report
      kcsan: Make reporting aware of KCSAN tests
      checkpatch: Warn about data_race() without comment
      kcsan: Add __kcsan_{enable,disable}_current() variants
      objtool, kcsan: Add kcsan_disable_current() and kcsan_enable_current_nowarn()

Qiujun Huang (1):
      kcsan: Fix a typo in a comment

Wei Yongjun (1):
      kcsan: Use GFP_ATOMIC under spin lock

 Documentation/dev-tools/kcsan.rst | 228 ++++++++++++-------
 include/linux/compiler.h          |   4 +-
 include/linux/kcsan-checks.h      | 261 ++++++++++++++++++----
 include/linux/kcsan.h             |  19 +-
 init/init_task.c                  |   1 +
 kernel/kcsan/atomic.h             |  21 +-
 kernel/kcsan/core.c               | 183 ++++++++++-----
 kernel/kcsan/debugfs.c            |  47 +++-
 kernel/kcsan/kcsan.h              |   8 +-
 kernel/kcsan/report.c             | 455 ++++++++++++++++++++++++--------------
 lib/Kconfig.kcsan                 |  39 +++-
 scripts/checkpatch.pl             |   8 +
 tools/objtool/check.c             |   4 +
 13 files changed, 880 insertions(+), 398 deletions(-)