Revision - 8f86f83 - ftrace: Fix updating of filters for shared global_ops filters - origin: https://github.com/torvalds/linux

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Revision 8f86f83709c585742dea5dd7f0d2b79c43f992ec authored by Steven Rostedt (Red Hat) on 13 January 2015, 16:20:43 UTC, committed by Steven Rostedt on 15 January 2015, 14:37:07 UTC

ftrace: Fix updating of filters for shared global_ops filters

As the set_ftrace_filter affects both the function tracer as well as the
function graph tracer, the ops that represent each have a shared
ftrace_ops_hash structure. This allows both to be updated when the filter
files are updated.

But if function graph is enabled and the global_ops (function tracing) ops
is not, then it is possible that the filter could be changed without the
update happening for the function graph ops. This will cause the changes
to not take place and may even cause a ftrace_bug to occur as it could mess
with the trampoline accounting.

The solution is to check if the ops uses the shared global_ops filter and
if the ops itself is not enabled, to check if there's another ops that is
enabled and also shares the global_ops filter. In that case, the
modification still needs to be executed.

Link: http://lkml.kernel.org/r/20150114154329.055980438@goodmis.org

Cc: stable@vger.kernel.org # 3.17+
Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 parent b1940cd

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Tip revision: 8f86f83709c585742dea5dd7f0d2b79c43f992ec authored by Steven Rostedt (Red Hat) on 13 January 2015, 16:20:43 UTC
ftrace: Fix updating of filters for shared global_ops filters

Tip revision: 8f86f83

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ftrace: Fix updating of filters for shared global_ops filters

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