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When writing a patch that adds a igt_warn() when lockdep is unavailable, I noticed that the warn error doesn't work any more. Fix this by monitoring stderr, and only setting 'pass' when stderr is empty. v2 (mlankhorst): - changed to not use len over a potentially large string in response to review comments. Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Dylan Baker <baker.dylan.c@gmail.com> Reviewed-by: Dylan Baker <baker.dylan.c@gmail.com> Reviewed-by: Martin Peres <martin.peres@linux.intel.com>
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