ftrace: Check for empty hash and comment the race with registering probes

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The race between adding a function probe and reading the probes that exist
is very subtle. It needs a comment. Also, the issue can also happen if the
probe has has the EMPTY_HASH as its func_hash.

Cc: stable@vger.kernel.org
Fixes: 7b60f3d876 ("ftrace: Dynamically create the probe ftrace_ops for the trace_array")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

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Steven Rostedt (VMware) 2019-08-30 16:30:01 -04:00

parent 7bd46644ea

commit 372e0d01da

1 changed files with 9 additions and 1 deletions

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kernel/trace/ftrace.c

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