scripts/coccinelle/locks/mini_lock.cocci

Source file repositories/reference/linux-study-clean/scripts/coccinelle/locks/mini_lock.cocci

File Facts

System
Linux kernel
Corpus path
scripts/coccinelle/locks/mini_lock.cocci
Extension
.cocci
Size
1812 bytes
Lines
100
Domain
Support Tooling And Documentation
Bucket
scripts
Inferred role
Support Tooling And Documentation: scripts
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-only
/// Find missing unlocks.  This semantic match considers the specific case
/// where the unlock is missing from an if branch, and there is a lock
/// before the if and an unlock after the if.  False positives are due to
/// cases where the if branch represents a case where the function is
/// supposed to exit with the lock held, or where there is some preceding
/// function call that releases the lock.
///
// Confidence: Moderate
// Copyright: (C) 2010-2012 Nicolas Palix.
// Copyright: (C) 2010-2012 Julia Lawall, INRIA/LIP6.
// Copyright: (C) 2010-2012 Gilles Muller, INRIA/LiP6.
// URL: https://coccinelle.gitlabpages.inria.fr/website
// Comments:
// Options: --no-includes --include-headers

virtual context
virtual org
virtual report

@prelocked@
position p1,p;
expression E1;
@@

(
mutex_lock@p1
|
mutex_trylock@p1
|
spin_lock@p1
|
spin_trylock@p1
|
read_lock@p1
|
read_trylock@p1
|
write_lock@p1
|
write_trylock@p1
|
read_lock_irq@p1
|
write_lock_irq@p1
|
read_lock_irqsave@p1
|
write_lock_irqsave@p1
|
spin_lock_irq@p1
|
spin_lock_irqsave@p1
) (E1@p,...);

@looped@
position r;
@@

for(...;...;...) { <+... return@r ...; ...+> }

@err exists@
expression E1;
position prelocked.p;
position up != prelocked.p1;
position r!=looped.r;
identifier lock,unlock;
@@

*lock(E1@p,...);

Annotation

Implementation Notes