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Catch up to linux-user's 8f67b9c694d0, 13c13397556a, 2f7828b57293, and 95059f9c313a by Richard Henderson which made reserved_va a run-time calculation, defaulting to nothing except in the case of 64-bit host 32-bit target. Also include the adjustment of the comment heading that work submitted in the same patch stream. Since this is a direct copy, squash it into one patch rather than follow the Linux evolution since breaking this down further at this point doesn't make sense for this "new code". Signed-off-by: Warner Losh <imp@bsdimp.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>