[0.2] Backports#5074
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JohnTitor merged 3 commits intorust-lang:libc-0.2from Apr 23, 2026
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(cherry picked from commit 088a284)
Add `PR_SET_MEMORY_MERGE` and `PR_GET_MEMORY_MERGE` prctl constants for the linux target. These control [per-process opt-in to KSM](https://lwn.net/Articles/953141/) and have been available since kernel 6.4. They were already defined for the android target but missing from linux (cherry picked from commit 545663c)
These are values for the flag parameter in the Apple-specific `kevent64` syscall: https://github.com/apple-oss-distributions/xnu/blob/f6217f891ac0bb64f3d375211650a4c1ff8ca1ea/bsd/sys/event.h#L138-L141 (cherry picked from commit 708f24e)
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with commit Apr 23, 2026
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Backport the following: