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Linus Torvalds
2e68039281
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