diff options
Diffstat (limited to 'Documentation/RCU')
| -rw-r--r-- | Documentation/RCU/listRCU.rst | 10 | ||||
| -rw-r--r-- | Documentation/RCU/whatisRCU.rst | 3 |
2 files changed, 9 insertions, 4 deletions
diff --git a/Documentation/RCU/listRCU.rst b/Documentation/RCU/listRCU.rst index ed5c9d8c9afe..d8bb98623c12 100644 --- a/Documentation/RCU/listRCU.rst +++ b/Documentation/RCU/listRCU.rst @@ -334,7 +334,7 @@ If the system-call audit module were to ever need to reject stale data, one way to accomplish this would be to add a ``deleted`` flag and a ``lock`` spinlock to the ``audit_entry`` structure, and modify audit_filter_task() as follows:: - static enum audit_state audit_filter_task(struct task_struct *tsk) + static struct audit_entry *audit_filter_task(struct task_struct *tsk, char **key) { struct audit_entry *e; enum audit_state state; @@ -346,16 +346,18 @@ to accomplish this would be to add a ``deleted`` flag and a ``lock`` spinlock to if (e->deleted) { spin_unlock(&e->lock); rcu_read_unlock(); - return AUDIT_BUILD_CONTEXT; + return NULL; } rcu_read_unlock(); if (state == AUDIT_STATE_RECORD) *key = kstrdup(e->rule.filterkey, GFP_ATOMIC); - return state; + /* As long as e->lock is held, e is valid and + * its value is not stale */ + return e; } } rcu_read_unlock(); - return AUDIT_BUILD_CONTEXT; + return NULL; } The ``audit_del_rule()`` function would need to set the ``deleted`` flag under the diff --git a/Documentation/RCU/whatisRCU.rst b/Documentation/RCU/whatisRCU.rst index 53faeed7c190..be2eb6be16ec 100644 --- a/Documentation/RCU/whatisRCU.rst +++ b/Documentation/RCU/whatisRCU.rst @@ -15,6 +15,9 @@ to start learning about RCU: | 2014 Big API Table https://lwn.net/Articles/609973/ | 6. The RCU API, 2019 Edition https://lwn.net/Articles/777036/ | 2019 Big API Table https://lwn.net/Articles/777165/ +| 7. The RCU API, 2024 Edition https://lwn.net/Articles/988638/ +| 2024 Background Information https://lwn.net/Articles/988641/ +| 2024 Big API Table https://lwn.net/Articles/988666/ For those preferring video: |