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The "x86: 32-bit cleanups" patch series[1] from @arnd hit #linux-next and thus is slated for inclusion in #kernel 6.15.

It removes some #LinuxKernel code like CONFIG_HIGHMEM64G that complicates things in some areas, but is mainly "about running 32-bit kernels on 64-bit hardware, which usually works but should probably be discouraged more clearly by only providing support for features that are used on real 32-bit hardware" – and unlikely to be used in the wild.

[1] https://lore.kernel.org/all/20250226213714.4040853-1-arnd@kernel.org/