11c27b644SPaul E. McKenney// SPDX-License-Identifier: GPL-2.0+ 21c27b644SPaul E. McKenney(* 31c27b644SPaul E. McKenney * Copyright (C) 2015 Jade Alglave <j.alglave@ucl.ac.uk>, 41c27b644SPaul E. McKenney * Copyright (C) 2016 Luc Maranget <luc.maranget@inria.fr> for Inria 51c27b644SPaul E. McKenney * Copyright (C) 2017 Alan Stern <stern@rowland.harvard.edu>, 61c27b644SPaul E. McKenney * Andrea Parri <parri.andrea@gmail.com> 71c27b644SPaul E. McKenney * 81c27b644SPaul E. McKenney * An earlier version of this file appears in the companion webpage for 91c27b644SPaul E. McKenney * "Frightening small children and disconcerting grown-ups: Concurrency 101c27b644SPaul E. McKenney * in the Linux kernel" by Alglave, Maranget, McKenney, Parri, and Stern, 111c27b644SPaul E. McKenney * which is to appear in ASPLOS 2018. 121c27b644SPaul E. McKenney *) 131c27b644SPaul E. McKenney 1448d44d4eSAndrea Parri"Linux-kernel memory consistency model" 151c27b644SPaul E. McKenney 161c27b644SPaul E. McKenneyenum Accesses = 'once (*READ_ONCE,WRITE_ONCE,ACCESS_ONCE*) || 171c27b644SPaul E. McKenney 'release (*smp_store_release*) || 181c27b644SPaul E. McKenney 'acquire (*smp_load_acquire*) || 191c27b644SPaul E. McKenney 'noreturn (* R of non-return RMW *) 201c27b644SPaul E. McKenneyinstructions R[{'once,'acquire,'noreturn}] 211c27b644SPaul E. McKenneyinstructions W[{'once,'release}] 221c27b644SPaul E. McKenneyinstructions RMW[{'once,'acquire,'release}] 231c27b644SPaul E. McKenney 241c27b644SPaul E. McKenneyenum Barriers = 'wmb (*smp_wmb*) || 251c27b644SPaul E. McKenney 'rmb (*smp_rmb*) || 261c27b644SPaul E. McKenney 'mb (*smp_mb*) || 271c27b644SPaul E. McKenney 'rb_dep (*smp_read_barrier_depends*) || 281c27b644SPaul E. McKenney 'rcu-lock (*rcu_read_lock*) || 291c27b644SPaul E. McKenney 'rcu-unlock (*rcu_read_unlock*) || 301c27b644SPaul E. McKenney 'sync-rcu (*synchronize_rcu*) || 31cac79a39SPaul E. McKenney 'before-atomic (*smp_mb__before_atomic*) || 32cac79a39SPaul E. McKenney 'after-atomic (*smp_mb__after_atomic*) || 33cac79a39SPaul E. McKenney 'after-spinlock (*smp_mb__after_spinlock*) 341c27b644SPaul E. McKenneyinstructions F[Barriers] 351c27b644SPaul E. McKenney 361c27b644SPaul E. McKenney(* Compute matching pairs of nested Rcu-lock and Rcu-unlock *) 371c27b644SPaul E. McKenneylet matched = let rec 381c27b644SPaul E. McKenney unmatched-locks = Rcu-lock \ domain(matched) 391c27b644SPaul E. McKenney and unmatched-unlocks = Rcu-unlock \ range(matched) 401c27b644SPaul E. McKenney and unmatched = unmatched-locks | unmatched-unlocks 411c27b644SPaul E. McKenney and unmatched-po = [unmatched] ; po ; [unmatched] 421c27b644SPaul E. McKenney and unmatched-locks-to-unlocks = 431c27b644SPaul E. McKenney [unmatched-locks] ; po ; [unmatched-unlocks] 441c27b644SPaul E. McKenney and matched = matched | (unmatched-locks-to-unlocks \ 451c27b644SPaul E. McKenney (unmatched-po ; unmatched-po)) 461c27b644SPaul E. McKenney in matched 471c27b644SPaul E. McKenney 481c27b644SPaul E. McKenney(* Validate nesting *) 491c27b644SPaul E. McKenneyflag ~empty Rcu-lock \ domain(matched) as unbalanced-rcu-locking 501c27b644SPaul E. McKenneyflag ~empty Rcu-unlock \ range(matched) as unbalanced-rcu-locking 511c27b644SPaul E. McKenney 521c27b644SPaul E. McKenney(* Outermost level of nesting only *) 531c27b644SPaul E. McKenneylet crit = matched \ (po^-1 ; matched ; po^-1) 54