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b22e279797
Currently, the SET_ERROR tracepoint triggers regardless of whether there is an error or not. On Illumos, SET_ERROR only triggers on an actual error, which is avoids irrelevant noise. Linux 2.6.38 added support for conditional tracepoints, so we modify SET_ERROR to use them when they are avaliable for functionality equivalent to the Illumos functionality. Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #4043