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ring-buffer: Do not record in NMI if the arch does not support cmpxchg in NMI
[ Upstream commit 712292308a
]
As the ring buffer recording requires cmpxchg() to work, if the
architecture does not support cmpxchg in NMI, then do not do any recording
within an NMI.
Link: https://lore.kernel.org/linux-trace-kernel/20231213175403.6fc18540@gandalf.local.home
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -3603,6 +3603,12 @@ rb_reserve_next_event(struct trace_buffer *buffer,
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int nr_loops = 0;
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int add_ts_default;
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/* ring buffer does cmpxchg, make sure it is safe in NMI context */
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if (!IS_ENABLED(CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG) &&
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(unlikely(in_nmi()))) {
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return NULL;
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}
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rb_start_commit(cpu_buffer);
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/* The commit page can not change after this */
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