[GIT PULL kcsan] KCSAN commits for v5.10

[Paul E. McKenney]

Hello, Ingo!

This pull request contains KCSAN updates for v5.10.  These have been
subjected to LKML review, most recently here:

	https://lore.kernel.org/lkml/20200831181715.GA1530@paulmck-ThinkPad-P72

All of these have also been subjected to the kbuild test robot and
-next testing.  The following changes since v5.9-rc1 are available in
the git repository at:

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

for you to fetch changes up to cd290ec24633f51029dab0d25505fae7da0e1eda:

  kcsan: Use tracing-safe version of prandom (2020-08-30 21:50:13 -0700)

----------------------------------------------------------------
Marco Elver (19):
      kcsan: Add support for atomic builtins
      objtool: Add atomic builtin TSAN instrumentation to uaccess whitelist
      kcsan: Add atomic builtin test case
      kcsan: Support compounded read-write instrumentation
      objtool, kcsan: Add __tsan_read_write to uaccess whitelist
      kcsan: Skew delay to be longer for certain access types
      kcsan: Add missing CONFIG_KCSAN_IGNORE_ATOMICS checks
      kcsan: Test support for compound instrumentation
      instrumented.h: Introduce read-write instrumentation hooks
      asm-generic/bitops: Use instrument_read_write() where appropriate
      locking/atomics: Use read-write instrumentation for atomic RMWs
      kcsan: Simplify debugfs counter to name mapping
      kcsan: Simplify constant string handling
      kcsan: Remove debugfs test command
      kcsan: Show message if enabled early
      kcsan: Use pr_fmt for consistency
      kcsan: Optimize debugfs stats counters
      bitops, kcsan: Partially revert instrumentation for non-atomic bitops
      kcsan: Use tracing-safe version of prandom

 include/asm-generic/atomic-instrumented.h          | 330 ++++++++++-----------
 include/asm-generic/bitops/instrumented-atomic.h   |   6 +-
 include/asm-generic/bitops/instrumented-lock.h     |   2 +-
 .../asm-generic/bitops/instrumented-non-atomic.h   |  30 +-
 include/linux/instrumented.h                       |  30 ++
 include/linux/kcsan-checks.h                       |  45 ++-
 kernel/kcsan/core.c                                | 210 +++++++++++--
 kernel/kcsan/debugfs.c                             | 130 ++------
 kernel/kcsan/kcsan-test.c                          | 128 +++++++-
 kernel/kcsan/kcsan.h                               |  12 +-
 kernel/kcsan/report.c                              |  10 +-
 kernel/kcsan/selftest.c                            |   8 +-
 lib/Kconfig.kcsan                                  |   5 +
 scripts/Makefile.kcsan                             |   2 +-
 scripts/atomic/gen-atomic-instrumented.sh          |  21 +-
 tools/objtool/check.c                              |  55 ++++
 16 files changed, 677 insertions(+), 347 deletions(-)