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Introduce a function to duplicate an existing file descriptor in the fdarray structure. The function returns the position of the duplicated file descriptor. Reviewed-by: Riccardo Mancini <[email protected]> Signed-off-by: Alexey Bayduraev <[email protected]> Tested-by: Jiri Olsa <[email protected]> Tested-by: Riccardo Mancini <[email protected]> Acked-by: Namhyung Kim <[email protected]> Cc: Adrian Hunter <[email protected]> Cc: Alexander Antonov <[email protected]> Cc: Alexander Shishkin <[email protected]> Cc: Alexei Budankov <[email protected]> Cc: Andi Kleen <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Peter Zijlstra <[email protected]> Link: https://lore.kernel.org/r/2891f1def287d5863cc82683a4d5879195c8d90c.1642440724.git.alexey.v.bayduraev@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>