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The struct lock_contention_key is never used, remove it. Signed-off-by: Yuan Can <yuancan@huawei.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: https://lore.kernel.org/linux-perf-users/20220927013931.110475-6-yuancan@huawei.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>