On Tue, Oct 05, 2021 at 01:37:49PM -0400, Camm Maguire wrote: >... > To me it seems that the 64bit kernel, if it > offers a compatibility mode, should match whatever the contemporaneous > 32bit kernel behavior is, making this a bug in the compatibility mode. >...
You are expecting compatibility with something that is changable even in 32bit kernels. For both 32bit x86 and 32bit arm, the amount of address space provided to userspace is a compile option for the kernel: https://sources.debian.org/src/linux/5.14.9-2/arch/arm/Kconfig/#L1250 https://sources.debian.org/src/linux/5.14.9-2/arch/x86/Kconfig/#L1412 cu Adrian
