Merge tag 'sched-core-2023-02-20' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull scheduler updates from Ingo Molnar:

 - Improve the scalability of the CFS bandwidth unthrottling logic with
   large number of CPUs.

 - Fix & rework various cpuidle routines, simplify interaction with the
   generic scheduler code. Add __cpuidle methods as noinstr to objtool's
   noinstr detection and fix boatloads of cpuidle bugs & quirks.

 - Add new ABI: introduce MEMBARRIER_CMD_GET_REGISTRATIONS, to query
   previously issued registrations.

 - Limit scheduler slice duration to the sysctl_sched_latency period, to
   improve scheduling granularity with a large number of SCHED_IDLE
   tasks.

 - Debuggability enhancement on sys_exit(): warn about disabled IRQs,
   but also enable them to prevent a cascade of followup problems and
   repeat warnings.

 - Fix the rescheduling logic in prio_changed_dl().

 - Micro-optimize cpufreq and sched-util methods.

 - Micro-optimize ttwu_runnable()

 - Micro-optimize the idle-scanning in update_numa_stats(),
   select_idle_capacity() and steal_cookie_task().

 - Update the RSEQ code & self-tests

 - Constify various scheduler methods

 - Remove unused methods

 - Refine __init tags

 - Documentation updates

 - Misc other cleanups, fixes

* tag 'sched-core-2023-02-20' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (110 commits)
  sched/rt: pick_next_rt_entity(): check list_entry
  sched/deadline: Add more reschedule cases to prio_changed_dl()
  sched/fair: sanitize vruntime of entity being placed
  sched/fair: Remove capacity inversion detection
  sched/fair: unlink misfit task from cpu overutilized
  objtool: mem*() are not uaccess safe
  cpuidle: Fix poll_idle() noinstr annotation
  sched/clock: Make local_clock() noinstr
  sched/clock/x86: Mark sched_clock() noinstr
  x86/pvclock: Improve atomic update of last_value in pvclock_clocksource_read()
  x86/atomics: Always inline arch_atomic64*()
  cpuidle: tracing, preempt: Squash _rcuidle tracing
  cpuidle: tracing: Warn about !rcu_is_watching()
  cpuidle: lib/bug: Disable rcu_is_watching() during WARN/BUG
  cpuidle: drivers: firmware: psci: Dont instrument suspend code
  KVM: selftests: Fix build of rseq test
  exit: Detect and fix irq disabled state in oops
  cpuidle, arm64: Fix the ARM64 cpuidle logic
  cpuidle: mvebu: Fix duplicate flags assignment
  sched/fair: Limit sched slice duration
  ...

1 files changed, 25 insertions, 0 deletions

diff --git a/include/linux/mm.h b/include/linux/mm.h
index bd3197748562..716d30d93616 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1982,6 +1982,31 @@ struct zap_details {
 /* Set in unmap_vmas() to indicate a final unmap call.  Only used by hugetlb */
 #define  ZAP_FLAG_UNMAP              ((__force zap_flags_t) BIT(1))
 
+#ifdef CONFIG_SCHED_MM_CID
+void sched_mm_cid_before_execve(struct task_struct *t);
+void sched_mm_cid_after_execve(struct task_struct *t);
+void sched_mm_cid_fork(struct task_struct *t);
+void sched_mm_cid_exit_signals(struct task_struct *t);
+static inline int task_mm_cid(struct task_struct *t)
+{
+	return t->mm_cid;
+}
+#else
+static inline void sched_mm_cid_before_execve(struct task_struct *t) { }
+static inline void sched_mm_cid_after_execve(struct task_struct *t) { }
+static inline void sched_mm_cid_fork(struct task_struct *t) { }
+static inline void sched_mm_cid_exit_signals(struct task_struct *t) { }
+static inline int task_mm_cid(struct task_struct *t)
+{
+	/*
+	 * Use the processor id as a fall-back when the mm cid feature is
+	 * disabled. This provides functional per-cpu data structure accesses
+	 * in user-space, althrough it won't provide the memory usage benefits.
+	 */
+	return raw_smp_processor_id();
+}
+#endif
+
 #ifdef CONFIG_MMU
 extern bool can_do_mlock(void);
 #else