tools/memory-model/linux-kernel.bell

Source file repositories/reference/linux-study-clean/tools/memory-model/linux-kernel.bell

File Facts

System
Linux kernel
Corpus path
tools/memory-model/linux-kernel.bell
Extension
.bell
Size
3619 bytes
Lines
100
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: tools
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

// 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 *) ||
		'MB (*xchg(),cmpxchg(),...*)
instructions R[Accesses]
instructions W[Accesses]
instructions RMW[Accesses]

enum Barriers = 'wmb (*smp_wmb*) ||
		'rmb (*smp_rmb*) ||
		'MB (*smp_mb*) ||
		'barrier (*barrier*) ||
		'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*) ||
		'after-srcu-read-unlock (*smp_mb__after_srcu_read_unlock*)
instructions F[Barriers]


(*
 * Filter out syntactic annotations that do not provide the corresponding
 * semantic ordering, such as Acquire on a store or Mb on a failed RMW.
 *)
let FailedRMW = RMW \ (domain(rmw) | range(rmw))
let Acquire = ACQUIRE \ W \ FailedRMW
let Release = RELEASE \ R \ FailedRMW
let Mb = MB \ FailedRMW
let Noreturn = NORETURN \ W

(* SRCU *)
enum SRCU = 'srcu-lock || 'srcu-unlock || 'sync-srcu
instructions 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 unmatched-rcu-lock
flag ~empty Rcu-unlock \ range(rcu-rscs) as unmatched-rcu-unlock

Annotation

Implementation Notes