This file is indexed.

/usr/arm-linux-gnueabihf/include/linux/irqnr.h is in linux-libc-dev-armhf-cross 4.9.25-1cross1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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/*
 * There isn't anything here anymore, but the file must not be empty or patch
 * will delete it.
 */