> So in px4, I end up seeing stack usage 100% on some threads (in "ps"), which 
> I want to fix.

PR #1900 (https://github.com/apache/incubator-nuttx/pull/1900) fixes the issue.

> In the past (9 or so years ago) there was an issue with floating point that
> required the stack to be 8 byte aligned. It was too long ago, so I do not
> remember the details

This is currently not an issue. The alignment of the stack pointer to 8 bytes 
is assured.
The size of the stack is not forced to be 8 aligned, but that doesn't matter: 
Either your stack is large enough, or not.
But thanks for your hint.

Johannes

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