// SPDX-License-Identifier: GPL-2.0+(* * Copyright (C) 2015 Jade Alglave <j.alglave@ucl.ac.uk>, * Copyright (C) 2016 Luc Maranget <luc.maranget@inria.fr> for Inria * Copyright (C) 2017 Alan Stern <stern@rowland.harvard.edu>, *                    Andrea Parri <parri.andrea@gmail.com> * * An earlier version of this file appeared in the companion webpage for * "Frightening small children and disconcerting grown-ups: Concurrency * in the Linux kernel" by Alglave, Maranget, McKenney, Parri, and Stern, * which appeared in ASPLOS 2018. *) "Linux-kernel memory consistency model" enum Accesses = 'once (*READ_ONCE,WRITE_ONCE*) ||		'release (*smp_store_release*) ||		'acquire (*smp_load_acquire*) ||		'noreturn (* R of non-return RMW *)instructions R[{'once,'acquire,'noreturn}]instructions W[{'once,'release}]instructions RMW[{'once,'acquire,'release}] enum Barriers = 'wmb (*smp_wmb*) ||		'rmb (*smp_rmb*) ||		'mb (*smp_mb*) ||		'rcu-lock (*rcu_read_lock*)  ||		'rcu-unlock (*rcu_read_unlock*) ||		'sync-rcu (*synchronize_rcu*) ||		'before-atomic (*smp_mb__before_atomic*) ||		'after-atomic (*smp_mb__after_atomic*) ||		'after-spinlock (*smp_mb__after_spinlock*) ||		'after-unlock-lock (*smp_mb__after_unlock_lock*)instructions F[Barriers] (* SRCU *)enum SRCU = 'srcu-lock || 'srcu-unlock || 'sync-srcuinstructions SRCU[SRCU](* All srcu events *)let Srcu = Srcu-lock | Srcu-unlock | Sync-srcu (* Compute matching pairs of nested Rcu-lock and Rcu-unlock *)let rcu-rscs = let rec	    unmatched-locks = Rcu-lock \ domain(matched)	and unmatched-unlocks = Rcu-unlock \ range(matched)	and unmatched = unmatched-locks | unmatched-unlocks	and unmatched-po = [unmatched] ; po ; [unmatched]	and unmatched-locks-to-unlocks =		[unmatched-locks] ; po ; [unmatched-unlocks]	and matched = matched | (unmatched-locks-to-unlocks \		(unmatched-po ; unmatched-po))	in matched (* Validate nesting *)flag ~empty Rcu-lock \ domain(rcu-rscs) as unbalanced-rcu-lockingflag ~empty Rcu-unlock \ range(rcu-rscs) as unbalanced-rcu-locking (* Compute matching pairs of nested Srcu-lock and Srcu-unlock *)let srcu-rscs = let rec	    unmatched-locks = Srcu-lock \ domain(matched)	and unmatched-unlocks = Srcu-unlock \ range(matched)	and unmatched = unmatched-locks | unmatched-unlocks	and unmatched-po = ([unmatched] ; po ; [unmatched]) & loc	and unmatched-locks-to-unlocks =		([unmatched-locks] ; po ; [unmatched-unlocks]) & loc	and matched = matched | (unmatched-locks-to-unlocks \		(unmatched-po ; unmatched-po))	in matched (* Validate nesting *)flag ~empty Srcu-lock \ domain(srcu-rscs) as unbalanced-srcu-lockingflag ~empty Srcu-unlock \ range(srcu-rscs) as unbalanced-srcu-locking (* Check for use of synchronize_srcu() inside an RCU critical section *)flag ~empty rcu-rscs & (po ; [Sync-srcu] ; po) as invalid-sleep (* Validate SRCU dynamic match *)flag ~empty different-values(srcu-rscs) as srcu-bad-nesting