Hi! On Tue, Apr 28, 2020 at 09:25:17PM +1000, Nicholas Piggin wrote: > +config BUILD_BIG_ENDIAN_ELF_V2 > + bool "Build big-endian kernel using ELFv2 ABI (EXPERIMENTAL)" > + depends on PPC64 && CPU_BIG_ENDIAN && EXPERT > + default n > + select BUILD_ELF_V2 > + help > + This builds the kernel image using the ELFv2 ABI, which has a > + reduced stack overhead and faster function calls. This does not > + affect the userspace ABIs. > + > + ELFv2 is the standard ABI for little-endian, but for big-endian > + this is an experimental option that is less tested (kernel and > + toolchain). This requires gcc 4.9 or newer and binutils 2.24 or > + newer.
Is it clear that this is only for 64-bit? Maybe this text should fit that in somewhere? It's not obvious to people who do not already know that ELFv2 is just the (nick-)name of a particular ABI, not a new kind of ELF (it is just version 1 ELF in fact), and that ABI is for 64-bit Power only. Segher
