On Thu, Jun 25, 2020 at 09:12:32PM -0700, Paul E. McKenney wrote:
> Hello!
>
> This pull request contains 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.
>
> This pull request is currently RFC pending ongoing -next testing.
And it has now cleared a round of -next testing! ;-)
Thanx, Paul
> This was not entirely free of drama, with Stephen needing to handle
> a merge conflict:
>
> https://lore.kernel.org/lkml/[email protected]/
>
> However, the resolution looks straightforward to me. In addition,
> these two commits pass rcutorture testing and associated KCSAN testing.
>
> 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/paulmck/linux-rcu.git
> rcu/urgent
>
> for you to fetch changes up to b58e733fd774f3f4b49d9e7640d172a57e35200e:
>
> rcu: Fixup noinstr warnings (2020-06-25 08:24:32 -0700)
>
> ----------------------------------------------------------------
> 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(-)
