linux-kernel - [PATCH v2 0/9] A few more cpuidle vs rcu fixes

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Date:   Thu, 26 Jan 2023 16:08:29 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     mingo@...nel.org
Cc:     will@...nel.org, peterz@...radead.org, boqun.feng@...il.com,
        mark.rutland@....com, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, dave.hansen@...ux.intel.com, x86@...nel.org,
        hpa@...or.com, seanjc@...gle.com, pbonzini@...hat.com,
        jgross@...e.com, srivatsa@...il.mit.edu, amakhalov@...are.com,
        pv-drivers@...are.com, wanpengli@...cent.com, vkuznets@...hat.com,
        boris.ostrovsky@...cle.com, rafael@...nel.org,
        daniel.lezcano@...aro.org, lpieralisi@...nel.org,
        frederic@...nel.org, paulmck@...nel.org, rostedt@...dmis.org,
        mhiramat@...nel.org, longman@...hat.com, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        bsegall@...gle.com, mgorman@...e.de, bristot@...hat.com,
        vschneid@...hat.com, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        linux-pm@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Subject: [PATCH v2 0/9] A few more cpuidle vs rcu fixes

0-day robot reported graph-tracing made the cpuidle-vs-rcu rework go splat.

These patches appear to cure this, the ftrace selftest now runs to completion
without spamming scary messages to dmesg.

Since v1:

 - fixed recursive RCU splats
 - fixed psci thingies for arm (null)
 - improved the tracing WARN (rostedt)
 - fixed TRACE_PREEMPT_TOGGLE (null)

---
 arch/x86/include/asm/atomic64_32.h | 44 +++++++++++++++++++-------------------
 arch/x86/include/asm/atomic64_64.h | 36 +++++++++++++++----------------
 arch/x86/include/asm/kvmclock.h    |  2 +-
 arch/x86/include/asm/paravirt.h    |  2 +-
 arch/x86/include/asm/pvclock.h     |  3 ++-
 arch/x86/kernel/cpu/vmware.c       |  2 +-
 arch/x86/kernel/kvmclock.c         |  6 +++---
 arch/x86/kernel/pvclock.c          | 22 +++++++++++++------
 arch/x86/kernel/tsc.c              |  7 +++---
 arch/x86/xen/time.c                | 12 +++++++++--
 drivers/cpuidle/cpuidle.c          |  2 +-
 drivers/cpuidle/poll_state.c       |  2 --
 drivers/firmware/psci/psci.c       | 31 ++++++++++++++++-----------
 include/linux/context_tracking.h   | 27 +++++++++++++++++++++++
 include/linux/math64.h             |  4 ++--
 include/linux/sched/clock.h        |  8 +++----
 include/linux/trace_recursion.h    | 18 ++++++++++++++++
 kernel/locking/lockdep.c           |  3 +++
 kernel/panic.c                     |  5 +++++
 kernel/sched/clock.c               | 27 +++++++++++++++++------
 kernel/trace/trace_preemptirq.c    |  6 ++----
 lib/bug.c                          | 15 ++++++++++++-
 22 files changed, 192 insertions(+), 92 deletions(-)