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Documentation: livepatch: Add livepatch API page
The livepatch subsystem has several exported functions and objects with kerneldoc comments. Though the livepatch documentation contains handwritten descriptions of all of these exported functions, they are currently not pulled into the docs build using the kernel-doc directive. In order to allow readers of the documentation to see the full kerneldoc comments in the generated documentation files, this change adds a new Documentation/livepatch/api.rst page which contains kernel-doc directives to link the kerneldoc comments directly in the documentation. With this, all of the hand-written descriptions of the APIs now cross-reference the kerneldoc comments on the new Livepatching APIs page, and running ./scripts/find-unused-docs.sh on kernel/livepatch no longer shows any files as missing documentation. Note that all of the handwritten API descriptions were left alone with the exception of Documentation/livepatch/system-state.rst, which was updated to allow the cross-referencing to work correctly. The file now follows the cross-referencing formatting guidance specified in Documentation/doc-guide/kernel-doc.rst. Furthermore, some comments around klp_shadow_free_all() were updated to say <_, id> rather than <*, id> to match the rest of the file, and to prevent the docs build from emitting an "Inline emphasis start-string without end string" error. Signed-off-by: David Vernet <void@manifault.com> Reviewed-by: Petr Mladek <pmladek@suse.com> Acked-by: Miroslav Benes <mbenes@suse.cz> Signed-off-by: Petr Mladek <pmladek@suse.com> Link: https://lore.kernel.org/r/20211221145743.4098360-1-void@manifault.com
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Documentation/livepatch/api.rst
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30
Documentation/livepatch/api.rst
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.. SPDX-License-Identifier: GPL-2.0
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=================
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Livepatching APIs
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=================
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Livepatch Enablement
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====================
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.. kernel-doc:: kernel/livepatch/core.c
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:export:
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Shadow Variables
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================
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.. kernel-doc:: kernel/livepatch/shadow.c
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:export:
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System State Changes
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====================
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.. kernel-doc:: kernel/livepatch/state.c
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:export:
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Object Types
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============
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.. kernel-doc:: include/linux/livepatch.h
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:identifiers: klp_patch klp_object klp_func klp_callbacks klp_state
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@ -14,6 +14,7 @@ Kernel Livepatching
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shadow-vars
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shadow-vars
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system-state
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system-state
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reliable-stacktrace
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reliable-stacktrace
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api
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.. only:: subproject and html
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.. only:: subproject and html
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@ -82,8 +82,8 @@ to do actions that can be done only once when a new variable is allocated.
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- call destructor function if defined
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- call destructor function if defined
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- free shadow variable
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- free shadow variable
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* klp_shadow_free_all() - detach and free all <*, id> shadow variables
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* klp_shadow_free_all() - detach and free all <_, id> shadow variables
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- find and remove any <*, id> references from global hashtable
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- find and remove any <_, id> references from global hashtable
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- if found
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- if found
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@ -52,12 +52,12 @@ struct klp_state:
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The state can be manipulated using two functions:
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The state can be manipulated using two functions:
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- *klp_get_state(patch, id)*
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- klp_get_state()
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- Get struct klp_state associated with the given livepatch
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- Get struct klp_state associated with the given livepatch
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and state id.
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and state id.
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- *klp_get_prev_state(id)*
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- klp_get_prev_state()
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- Get struct klp_state associated with the given feature id and
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- Get struct klp_state associated with the given feature id and
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already installed livepatches.
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already installed livepatches.
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@ -272,12 +272,12 @@ void klp_shadow_free(void *obj, unsigned long id, klp_shadow_dtor_t dtor)
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EXPORT_SYMBOL_GPL(klp_shadow_free);
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EXPORT_SYMBOL_GPL(klp_shadow_free);
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/**
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/**
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* klp_shadow_free_all() - detach and free all <*, id> shadow variables
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* klp_shadow_free_all() - detach and free all <_, id> shadow variables
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* @id: data identifier
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* @id: data identifier
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* @dtor: custom callback that can be used to unregister the variable
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* @dtor: custom callback that can be used to unregister the variable
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* and/or free data that the shadow variable points to (optional)
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* and/or free data that the shadow variable points to (optional)
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*
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*
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* This function releases the memory for all <*, id> shadow variable
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* This function releases the memory for all <_, id> shadow variable
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* instances, callers should stop referencing them accordingly.
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* instances, callers should stop referencing them accordingly.
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*/
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*/
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void klp_shadow_free_all(unsigned long id, klp_shadow_dtor_t dtor)
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void klp_shadow_free_all(unsigned long id, klp_shadow_dtor_t dtor)
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@ -288,7 +288,7 @@ void klp_shadow_free_all(unsigned long id, klp_shadow_dtor_t dtor)
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spin_lock_irqsave(&klp_shadow_lock, flags);
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spin_lock_irqsave(&klp_shadow_lock, flags);
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/* Delete all <*, id> from hash */
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/* Delete all <_, id> from hash */
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hash_for_each(klp_shadow_hash, i, shadow, node) {
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hash_for_each(klp_shadow_hash, i, shadow, node) {
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if (klp_shadow_match(shadow, shadow->obj, id))
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if (klp_shadow_match(shadow, shadow->obj, id))
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klp_shadow_free_struct(shadow, dtor);
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klp_shadow_free_struct(shadow, dtor);
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