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Adjust the following code documentation:
* Kernel-doc comments for ring_buffer_read_prepare() and
ring_buffer_read_finish() mention that recording to the ring buffer is
disabled when the read is active. Remove mention of this restriction
because it was already lifted in commit 1039221cc278 ("ring-buffer: Do
not disable recording when there is an iterator").
* Function ring_buffer_read_finish() performs a self-check of the
ring-buffer by locking cpu_buffer->reader_lock and then calling
rb_check_pages(). The preceding comment explains that the lock is
needed because rb_check_pages() clears the HEAD flag required by
readers which might be running in parallel. Remove this explanation
because commit 8843e06f67b1 ("ring-buffer: Handle race between
rb_move_tail and rb_check_pages") simplified the function so it no
longer resets the mentioned flag. Nonetheless, the lock is still
needed because a reader swapping a page into the ring buffer can make
the underlying doubly-linked list temporarily inconsistent.
This is a non-functional change.
Link: https://lore.kernel.org/linux-trace-kernel/20240517134008.24529-2-petr.pavlu@suse.com
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Petr Pavlu <petr.pavlu@suse.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
ea70a9628e