p71924506
/
linux_old1
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

rcu: Document RCU_NONIDLE() restrictions in comment header 

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2016-04-20 09:22:15 -07:00
parent 40e0a6cfd5
commit 810ce8b5df
1 changed files with 6 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
include/linux/rcupdate.h
View File

@ -379,12 +379,13 @@ static inline void rcu_init_nohz(void)
* in the inner idle loop.
*
* This macro provides the way out: RCU_NONIDLE(do_something_with_RCU())
* will tell RCU that it needs to pay attending, invoke its argument
* (in this example, a call to the do_something_with_RCU() function),
* will tell RCU that it needs to pay attention, invoke its argument
* (in this example, calling the do_something_with_RCU() function),
* and then tell RCU to go back to ignoring this CPU. It is permissible
* to nest RCU_NONIDLE() wrappers, but the nesting level is currently
* quite limited. If deeper nesting is required, it will be necessary
* to adjust DYNTICK_TASK_NESTING_VALUE accordingly.
* to nest RCU_NONIDLE() wrappers, but not indefinitely (but the limit is
* on the order of a million or so, even on 32-bit systems). It is
* not legal to block within RCU_NONIDLE(), nor is it permissible to
* transfer control either into or out of RCU_NONIDLE()'s statement.
*/
#define RCU_NONIDLE(a) \
do { \