sphinx.addnodesdocument)}( rawsourcechildren]( translations LanguagesNode)}(hhh](h pending_xref)}(hhh]docutils.nodesTextChinese (Simplified)}parenthsba attributes}(ids]classes]names]dupnames]backrefs] refdomainstdreftypedoc reftarget./translations/zh_CN/dev-tools/context-analysismodnameN classnameN refexplicitutagnamehhh ubh)}(hhh]hChinese (Traditional)}hh2sbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget./translations/zh_TW/dev-tools/context-analysismodnameN classnameN refexplicituh1hhh ubh)}(hhh]hItalian}hhFsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget./translations/it_IT/dev-tools/context-analysismodnameN classnameN refexplicituh1hhh ubh)}(hhh]hJapanese}hhZsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget./translations/ja_JP/dev-tools/context-analysismodnameN classnameN refexplicituh1hhh ubh)}(hhh]hKorean}hhnsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget./translations/ko_KR/dev-tools/context-analysismodnameN classnameN refexplicituh1hhh ubh)}(hhh]hPortuguese (Brazilian)}hhsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget./translations/pt_BR/dev-tools/context-analysismodnameN classnameN refexplicituh1hhh ubh)}(hhh]hSpanish}hhsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget./translations/sp_SP/dev-tools/context-analysismodnameN classnameN refexplicituh1hhh ubeh}(h]h ]h"]h$]h&]current_languageEnglishuh1h hh _documenthsourceNlineNubhcomment)}(h SPDX-License-Identifier: GPL-2.0h]h SPDX-License-Identifier: GPL-2.0}hhsbah}(h]h ]h"]h$]h&] xml:spacepreserveuh1hhhhhhH/var/lib/git/docbuild/linux/Documentation/dev-tools/context-analysis.rsthKubh)}(hCopyright (C) 2025, Google LLC.h]hCopyright (C) 2025, Google LLC.}hhsbah}(h]h ]h"]h$]h&]hhuh1hhhhhhhhKubhtarget)}(h.. _context-analysis:h]h}(h]h ]h"]h$]h&]refidcontext-analysisuh1hhKhhhhhhubhsection)}(hhh](htitle)}(hCompiler-Based Context Analysish]hCompiler-Based Context Analysis}(hhhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhhhhhKubh paragraph)}(hXxContext Analysis is a language extension, which enables statically checking that required contexts are active (or inactive) by acquiring and releasing user-definable "context locks". An obvious application is lock-safety checking for the kernel's various synchronization primitives (each of which represents a "context lock"), and checking that locking rules are not violated.h]hXContext Analysis is a language extension, which enables statically checking that required contexts are active (or inactive) by acquiring and releasing user-definable “context locks”. An obvious application is lock-safety checking for the kernel’s various synchronization primitives (each of which represents a “context lock”), and checking that locking rules are not violated.}(hhhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK hhhhubh)}(hThe Clang compiler currently supports the full set of context analysis features. To enable for Clang, configure the kernel with::h]hThe Clang compiler currently supports the full set of context analysis features. To enable for Clang, configure the kernel with:}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhhhhubh literal_block)}(hCONFIG_WARN_CONTEXT_ANALYSIS=yh]hCONFIG_WARN_CONTEXT_ANALYSIS=y}hjsbah}(h]h ]h"]h$]h&]hhuh1jhhhKhhhhubh)}(h'The feature requires Clang 23 or later.h]h'The feature requires Clang 23 or later.}(hj'hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhhhhubh)}(hThe analysis is *opt-in by default*, and requires declaring which modules and subsystems should be analyzed in the respective `Makefile`::h](hThe analysis is }(hj5hhhNhNubhemphasis)}(h*opt-in by default*h]hopt-in by default}(hj?hhhNhNubah}(h]h ]h"]h$]h&]uh1j=hj5ubh[, and requires declaring which modules and subsystems should be analyzed in the respective }(hj5hhhNhNubhtitle_reference)}(h `Makefile`h]hMakefile}(hjShhhNhNubah}(h]h ]h"]h$]h&]uh1jQhj5ubh:}(hj5hhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhKhhhhubj)}(h CONTEXT_ANALYSIS_mymodule.o := yh]h CONTEXT_ANALYSIS_mymodule.o := y}hjksbah}(h]h ]h"]h$]h&]hhuh1jhhhKhhhhubh)}(h/Or for all translation units in the directory::h]h.Or for all translation units in the directory:}(hjyhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhhhhubj)}(hCONTEXT_ANALYSIS := yh]hCONTEXT_ANALYSIS := y}hjsbah}(h]h ]h"]h$]h&]hhuh1jhhhKhhhhubh)}(hIt is possible to enable the analysis tree-wide, however, which will result in numerous false positive warnings currently and is *not* generally recommended::h](hIt is possible to enable the analysis tree-wide, however, which will result in numerous false positive warnings currently and is }(hjhhhNhNubj>)}(h*not*h]hnot}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j=hjubh generally recommended:}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhKhhhhubj)}(h"CONFIG_WARN_CONTEXT_ANALYSIS_ALL=yh]h"CONFIG_WARN_CONTEXT_ANALYSIS_ALL=y}hjsbah}(h]h ]h"]h$]h&]hhuh1jhhhK"hhhhubh)}(hhh](h)}(hProgramming Modelh]hProgramming Model}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhhhhhK%ubh)}(hJThe below describes the programming model around using context lock types.h]hJThe below describes the programming model around using context lock types.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK'hjhhubhnote)}(hEnabling context analysis can be seen as enabling a dialect of Linux C with a Context System. Some valid patterns involving complex control-flow are constrained (such as conditional acquisition and later conditional release in the same function).h]h)}(hEnabling context analysis can be seen as enabling a dialect of Linux C with a Context System. Some valid patterns involving complex control-flow are constrained (such as conditional acquisition and later conditional release in the same function).h]hEnabling context analysis can be seen as enabling a dialect of Linux C with a Context System. Some valid patterns involving complex control-flow are constrained (such as conditional acquisition and later conditional release in the same function).}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK*hjubah}(h]h ]h"]h$]h&]uh1jhjhhhhhNubh)}(hXContext analysis is a way to specify permissibility of operations to depend on context locks being held (or not held). Typically we are interested in protecting data and code in a critical section by requiring a specific context to be active, for example by holding a specific lock. The analysis ensures that callers cannot perform an operation without the required context being active.h]hXContext analysis is a way to specify permissibility of operations to depend on context locks being held (or not held). Typically we are interested in protecting data and code in a critical section by requiring a specific context to be active, for example by holding a specific lock. The analysis ensures that callers cannot perform an operation without the required context being active.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK/hjhhubh)}(hContext locks are associated with named structs, along with functions that operate on struct instances to acquire and release the associated context lock.h]hContext locks are associated with named structs, along with functions that operate on struct instances to acquire and release the associated context lock.}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK5hjhhubh)}(hXContext locks can be held either exclusively or shared. This mechanism allows assigning more precise privileges when a context is active, typically to distinguish where a thread may only read (shared) or also write (exclusive) to data guarded within a context.h]hXContext locks can be held either exclusively or shared. This mechanism allows assigning more precise privileges when a context is active, typically to distinguish where a thread may only read (shared) or also write (exclusive) to data guarded within a context.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK8hjhhubh)}(hXThe set of contexts that are actually active in a given thread at a given point in program execution is a run-time concept. The static analysis works by calculating an approximation of that set, called the context environment. The context environment is calculated for every program point, and describes the set of contexts that are statically known to be active, or inactive, at that particular point. This environment is a conservative approximation of the full set of contexts that will actually be active in a thread at run-time.h]hXThe set of contexts that are actually active in a given thread at a given point in program execution is a run-time concept. The static analysis works by calculating an approximation of that set, called the context environment. The context environment is calculated for every program point, and describes the set of contexts that are statically known to be active, or inactive, at that particular point. This environment is a conservative approximation of the full set of contexts that will actually be active in a thread at run-time.}(hj&hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK=hjhhubh)}(haMore details are also documented `here `_.h](h!More details are also documented }(hj4hhhNhNubh reference)}(h?`here `_h]hhere}(hj>hhhNhNubah}(h]h ]h"]h$]h&]namehererefuri5https://clang.llvm.org/docs/ThreadSafetyAnalysis.htmluh1j<hj4ubh)}(h8 h]h}(h]hereah ]h"]hereah$]h&]refurijOuh1h֌ referencedKhj4ubh.}(hj4hhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhKEhjhhubj)}(hX#Clang's analysis explicitly does not infer context locks acquired or released by inline functions. It requires explicit annotations to (a) assert that it's not a bug if a context lock is released or acquired, and (b) to retain consistency between inline and non-inline function declarations.h]h)}(hX#Clang's analysis explicitly does not infer context locks acquired or released by inline functions. It requires explicit annotations to (a) assert that it's not a bug if a context lock is released or acquired, and (b) to retain consistency between inline and non-inline function declarations.h]hX'Clang’s analysis explicitly does not infer context locks acquired or released by inline functions. It requires explicit annotations to (a) assert that it’s not a bug if a context lock is released or acquired, and (b) to retain consistency between inline and non-inline function declarations.}(hjlhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKIhjhubah}(h]h ]h"]h$]h&]uh1jhjhhhhhNubh)}(hhh](h)}(hSupported Kernel Primitivesh]hSupported Kernel Primitives}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhhhhhKOubh)}(hCurrently the following synchronization primitives are supported: `raw_spinlock_t`, `spinlock_t`, `rwlock_t`, `mutex`, `seqlock_t`, `bit_spinlock`, RCU, SRCU (`srcu_struct`), `rw_semaphore`, `local_lock_t`, `ww_mutex`.h](hBCurrently the following synchronization primitives are supported: }(hjhhhNhNubjR)}(h`raw_spinlock_t`h]hraw_spinlock_t}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jQhjubh, }(hjhhhNhNubjR)}(h `spinlock_t`h]h spinlock_t}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jQhjubh, }hjsbjR)}(h `rwlock_t`h]hrwlock_t}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jQhjubh, }hjsbjR)}(h`mutex`h]hmutex}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jQhjubh, }hjsbjR)}(h `seqlock_t`h]h seqlock_t}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jQhjubh, }(hjhhhNhNubjR)}(h`bit_spinlock`h]h bit_spinlock}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jQhjubh , RCU, SRCU (}(hjhhhNhNubjR)}(h `srcu_struct`h]h srcu_struct}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jQhjubh), }(hjhhhNhNubjR)}(h`rw_semaphore`h]h rw_semaphore}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jQhjubh, }hjsbjR)}(h`local_lock_t`h]h local_lock_t}(hj)hhhNhNubah}(h]h ]h"]h$]h&]uh1jQhjubh, }hjsbjR)}(h `ww_mutex`h]hww_mutex}(hj;hhhNhNubah}(h]h ]h"]h$]h&]uh1jQhjubh.}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhKQhjhhubh)}(hXTo initialize variables guarded by a context lock with an initialization function (``type_init(&lock)``), prefer using ``guard(type_init)(&lock)`` or ``scoped_guard(type_init, &lock) { ... }`` to initialize such guarded members or globals in the enclosing scope. This initializes the context lock and treats the context as active within the initialization scope (initialization implies exclusive access to the underlying object).h](hSTo initialize variables guarded by a context lock with an initialization function (}(hjShhhNhNubhliteral)}(h``type_init(&lock)``h]htype_init(&lock)}(hj]hhhNhNubah}(h]h ]h"]h$]h&]uh1j[hjSubh), prefer using }(hjShhhNhNubj\)}(h``guard(type_init)(&lock)``h]hguard(type_init)(&lock)}(hjohhhNhNubah}(h]h ]h"]h$]h&]uh1j[hjSubh or }(hjShhhNhNubj\)}(h*``scoped_guard(type_init, &lock) { ... }``h]h&scoped_guard(type_init, &lock) { ... }}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j[hjSubh to initialize such guarded members or globals in the enclosing scope. This initializes the context lock and treats the context as active within the initialization scope (initialization implies exclusive access to the underlying object).}(hjShhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhKVhjhhubh)}(h For example::h]h For example:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK]hjhhubj)}(hstruct my_data { spinlock_t lock; int counter __guarded_by(&lock); }; void init_my_data(struct my_data *d) { ... guard(spinlock_init)(&d->lock); d->counter = 0; ... }h]hstruct my_data { spinlock_t lock; int counter __guarded_by(&lock); }; void init_my_data(struct my_data *d) { ... guard(spinlock_init)(&d->lock); d->counter = 0; ... }}hjsbah}(h]h ]h"]h$]h&]hhuh1jhhhK_hjhhubh)}(hX=Alternatively, initializing guarded variables can be done with context analysis disabled, preferably in the smallest possible scope (due to lack of any other checking): either with a ``context_unsafe(var = init)`` expression, or by marking small initialization functions with the ``__context_unsafe(init)`` attribute.h](hAlternatively, initializing guarded variables can be done with context analysis disabled, preferably in the smallest possible scope (due to lack of any other checking): either with a }(hjhhhNhNubj\)}(h``context_unsafe(var = init)``h]hcontext_unsafe(var = init)}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j[hjubhC expression, or by marking small initialization functions with the }(hjhhhNhNubj\)}(h``__context_unsafe(init)``h]h__context_unsafe(init)}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j[hjubh attribute.}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhKlhjhhubh)}(hXLockdep assertions, such as `lockdep_assert_held()`, inform the compiler's context analysis that the associated synchronization primitive is held after the assertion. 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