registry team mailing list archive

[Nick Lowe <nick.lowe@xxxxxxxxx>]

The frustrating thing is that broken semantics for i686 have led to
absurd patches such as the following being proposed as a workaround:

http://groups.google.com/group/linux.kernel/browse_thread/thread/c1ec68f5498236dc/617726bec31595ed?show_docid=617726bec31595ed

The point that gets missed there is that, abstractly, a NOP is meant to
be exactly as it says on the tin, a No Operation.

It's meant to do nothing at all - for a predefined number of clock cycles.
A NOP is commonly used for timing purposes, that completely breaks that contract.

Again, NOPL is not standard i686 - it's an extension supported by the
vast, vast majority of i686 class processors. If you're compiling
generically for i686, you cannot assume that it is present.

Bad patches like the above to work around broken compilation cause more
harm than good, plastering over the real problem.

-- 
libc6 upgrade fails: illegal instruction
https://bugs.launchpad.net/bugs/587186
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