Linux's DMA engine framework has DMA_MEMCPY and DMA_MEMSET cap flags drivers can implement, but no code actually uses them... :-(
Opposite problem. The drivers implement it but there's no general kernel code using it.
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It matters most on nommu, where execve has to memcpy whole data seg (and text too for non-shareable-text binfmts).
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OMG. facepalm.
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