Additional discussion:
Several architectures, including x86, can not support write-only mappings.
actually on x86 the kernel can support it, just that it's highly expensive in
terms of performance so we don't currently do it. We could if we wanted to
though.
This patch will create a userspace ABI precedent that will hurt us if we ever
decide to implement this, or if Intel or AMD add support for this to the cpu...
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