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Linux Looking To Finally Kill Off HIGHPTE Support
Linux kernel developers are evaluating the idea of removing HIGHPTE support from the Linux kernel due to its maintenance burden and just one ARM system currently using it.
Linaro engineer Linus Walleij posted today a "request for comments" (RFC) to the Linux kernel mailing list on ending HIGHPTE support: " Matthew Wilcox suggests HIGHPTE is a burden for the kernel MM, and only one ARM system (vt8500) is currently using it. It was introduced in commit 65cec8e3db60 "ARM: implement highpte" in 2009, so this RFC is intended as a discussion item to check if it is still a desired feature 16 years later or if we can get rid of it."
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