The rcutorture scripting tools automatically create an initrd containing
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a single statically linked binary named "init" that loops over a
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very long sleep() call. In both cases, this creation is done by
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tools/testing/selftests/rcutorture/bin/mkinitrd.sh.
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However, if you don't like the notion of statically linked bare-bones
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userspace environments, you might wish to press an existing initrd
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into service:
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------------------------------------------------------------------------
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cd tools/testing/selftests/rcutorture
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zcat /initrd.img > /tmp/initrd.img.zcat
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mkdir initrd
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cd initrd
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cpio -id < /tmp/initrd.img.zcat
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# Manually verify that initrd contains needed binaries and libraries.
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