Linus Torvalds
2e68039281
Merge tag 'tracefs-v7.1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
...
Pull tracefs fixes from Steven Rostedt:
- Use list_add_tail_rcu() for walking eventfs children
The linked list of children is protected by SRCU and list walkers can
walk the list with only using SRCU. Using just list_add_tail() on
weakly ordered architectures can cause issues. Instead use
list_add_tail_rcu().
- Hold eventfs_mutex and SRCU for remount walk events
The trace_apply_options() walks the tracefs_inodes where some are
eventfs inodes and eventfs_remount() is called which in turn calls
eventfs_set_attr(). This walk only holds normal RCU read locks, but
the eventfs_mutex and SRCU should be held.
Add a eventfs_remount_(un)lock() helpers to take the necessary locks
before iterating the list.
* tag 'tracefs-v7.1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
eventfs: Hold eventfs_mutex and SRCU when remount walks events
eventfs: Use list_add_tail_rcu() for SRCU-protected children list
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