[GIT PULL] rcu/urgent for 5.8-rc3

[Borislav Petkov]

Hi Linus,

please pull two urgent RCU, KCSAN-related fixes.

Thx.

---

The following changes since commit b3a9e3b9622ae10064826dccb4f7a52bd88c7407:

  Linux 5.8-rc1 (2020-06-14 12:45:04 -0700)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git tags/rcu_urgent_for_5.8_rc3

for you to fetch changes up to b58e733fd774f3f4b49d9e7640d172a57e35200e:

  rcu: Fixup noinstr warnings (2020-06-25 08:24:32 -0700)

----------------------------------------------------------------
Paul E. McKenney says:

A single commit that uses "arch_" atomic operations to avoid the
instrumentation that comes with the non-"arch_" versions. In preparation
for that commit, it also has another commit that makes these "arch_"
atomic operations available to generic code.

Without these commits, KCSAN uses can see pointless errors.

Both from Peter Zijlstra.

----------------------------------------------------------------
Peter Zijlstra (2):
      locking/atomics: Provide the arch_atomic_ interface to generic code
      rcu: Fixup noinstr warnings

 include/linux/atomic-fallback.h       | 236 +++++++++++++++++++++++++++++++++-
 include/linux/compiler.h              |   2 +-
 kernel/rcu/tree.c                     |  32 ++++-
 scripts/atomic/gen-atomic-fallback.sh |  31 +++++
 4 files changed, 292 insertions(+), 9 deletions(-)

-- 
Regards/Gruss,
    Boris.

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