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Flush L1 data cache on syscall return with an error.
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Authored by kib on Oct 12 2018, 4:22 PM.
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Summary

A knob allows to select the flushing mode or turn it off/on.

It is curious that I was not able to measure statistically significant difference between flush enabled vs disabled using syscall_timing getuid.

List of ignored syscall errors should be updated.

The patch is based on the https://www.openwall.com/lists/kernel-hardening/2018/10/11/10

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rS FreeBSD src repository - subversion
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