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amd64: assume the kernel supports RDFSBASE and RDGSBASE

Description

amd64: assume the kernel supports RDFSBASE and RDGSBASE

There is no need to support pre-12.0 (and thus pre-ino64) kernels in a
15.x libc.

Continue to check if the CPU supports these features before using them
and fall back as required.

Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D50732

Details

Provenance
brooksAuthored on Aug 8 2025, 5:15 PM
Reviewer
kib
Differential Revision
D50732: amd64: assume the kernel supports RDFSBASE and RDGSBASE
Parents
rGaf261a46aff1: RELNOTES: Update the note for NVMeoF to reference ctld instead of nvmfd
Branches
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