Excerpts from Christophe Leroy's message of February 9, 2021 1:10 am:

This series implements C syscall entry/exit for PPC32. It reuses
the work already done for PPC64.

This series is based on today's merge-test (b6f72fc05389e3fc694bf5a5fa1bbd33f61879e0)

In terms on performance we have the following number of cycles on an
8xx running null_syscall benchmark:
- mainline: 296 cycles
- after patch 4: 283 cycles
- after patch 16: 304 cycles
- after patch 17: 348 cycles
- at the end of the series: 320 cycles

So in summary, we have a degradation of performance of 8% on null_syscall.

I think it is not a big degradation, it is worth it.

I guess it's 13% from 283. But it's very nice to use the shared C code.

There might be a few more percent speedup in there we can find later.

Thanks,
Nick