Plan 9 from Bell Labs’s /usr/web/sources/contrib/stallion/patch/ktrace-link-reg/readme

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Distributed under the MIT License.
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This patch addresses a long-standing bug and usability issue.

For architectures that do not rely exclusively on a link register
(such as ARM), ktrace would complain if a link register was not
provided as an argument.  The diagnostic was superfluous at best, and
inaccurate as zero is a valid link register value.

Finally, an acid line was printed to ease usability when analyzing
traces.

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