Re: [patch V2 00/18] mm/highmem: Preemptible variant of kmap_atomic & friends

From: Christophe Leroy
Date: Sat Oct 31 2020 - 11:03:10 EST



There are also some users on 10+ year old 32-bit netbooks or
business laptops, both x86 and Apple G4.
The longest-lived 32-bit embedded systems with large memory
(other than Arm) are probably NXP QorIQ P20xx/P40xx used in
military VME bus systems, and low-end embedded systems based
on Vortex86.
I'm less worried about all of these because upstream kernel
support for ppc32 and x86-32 is already bitrotting and they will
likely get stuck on the last working kernel before the
TI/Renesas/NXP Arm systems do.


Upstream kernel support for ppc32 is bitrotting, seriously ? What do you mean exactly ?

ppc32 is actively supported, with recent addition of support of hugepages, kasan, uaccess protection, VMAP stack, etc ...

Christophe