Commit 77dbd72b authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'livepatching-for-5.17' of... 

Merge tag 'livepatching-for-5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching

Pull livepatching updates from Petr Mladek:

 - Correctly handle kobjects when a livepatch init fails

 - Avoid CPU hogging when searching for many livepatched symbols

 - Add livepatch API page into documentation

* tag 'livepatching-for-5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching:
  livepatch: Avoid CPU hogging with cond_resched
  livepatch: Fix missing unlock on error in klp_enable_patch()
  livepatch: Fix kobject refcount bug on klp_init_patch_early failure path
  Documentation: livepatch: Add livepatch API page
parents d0a231f0 b2dfc3fe

Documentation/livepatch/api.rst

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+30 −0
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.. SPDX-License-Identifier: GPL-2.0



=================

Livepatching APIs

=================



Livepatch Enablement

====================



.. kernel-doc:: kernel/livepatch/core.c

   :export:





Shadow Variables

================



.. kernel-doc:: kernel/livepatch/shadow.c

   :export:



System State Changes

====================



.. kernel-doc:: kernel/livepatch/state.c

   :export:



Object Types

============



.. kernel-doc:: include/linux/livepatch.h

   :identifiers: klp_patch klp_object klp_func klp_callbacks klp_state

Documentation/livepatch/index.rst

+1 −0
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@@ -14,6 +14,7 @@ Kernel Livepatching 
    shadow-vars

    shadow-vars

    system-state

    system-state

    reliable-stacktrace

    reliable-stacktrace

    api





.. only::  subproject and html

.. only::  subproject and html

Documentation/livepatch/shadow-vars.rst

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@@ -82,8 +82,8 @@ to do actions that can be done only once when a new variable is allocated. 
      - call destructor function if defined

      - call destructor function if defined

      - free shadow variable

      - free shadow variable





* klp_shadow_free_all() - detach and free all <*, id> shadow variables

* klp_shadow_free_all() - detach and free all <_, id> shadow variables

  - find and remove any <*, id> references from global hashtable

  - find and remove any <_, id> references from global hashtable





    - if found

    - if found

Documentation/livepatch/system-state.rst

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@@ -52,12 +52,12 @@ struct klp_state: 




The state can be manipulated using two functions:

The state can be manipulated using two functions:





  - *klp_get_state(patch, id)*

  - klp_get_state()





    - Get struct klp_state associated with the given livepatch

    - Get struct klp_state associated with the given livepatch

      and state id.

      and state id.





  - *klp_get_prev_state(id)*

  - klp_get_prev_state()





    - Get struct klp_state associated with the given feature id and

    - Get struct klp_state associated with the given feature id and

      already installed livepatches.

      already installed livepatches.

kernel/kallsyms.c

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@@ -243,6 +243,7 @@ int kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *, 
		ret = fn(data, namebuf, NULL, kallsyms_sym_address(i));

		ret = fn(data, namebuf, NULL, kallsyms_sym_address(i));

		if (ret != 0)

		if (ret != 0)

			return ret;

			return ret;

		cond_resched();

	}

	}

	return 0;

	return 0;

}

}