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Commit6faea3422e("arch, mm: streamline HIGHMEM freeing") overzealously removed mem_init_free_highmem() function that beside freeing high memory pages checked for CPU support for high memory as a prerequisite. Partially restore mem_init_free_highmem() with a new highmem_init() name and make it discard high memory in case there is no CPU support for it. Link: https://lkml.kernel.org/r/20251231105701.519711-1-rppt@kernel.org Fixes:6faea3422e("arch, mm: streamline HIGHMEM freeing") Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org> Reported-by: Markus Stockhausen <markus.stockhausen@gmx.de> Cc: Chris Packham <chris.packham@alliedtelesis.co.nz> Cc: Hauke Mehrtens <hauke@hauke-m.de> Cc: Jonas Jelonek <jelonek.jonas@gmail.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Thomas Gleinxer <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>