tavip
commented
8 years ago The question is just - what would be the advisable approach - go for 64bit and try to solve the incompatibilities or rather go for 32bit and try to solve incompatibilities?
I don't know :) But I think it will require significant changes to support 32bit longs. And we need to do that without too much intrusion in the kernel.
If someone smarter than me is already working on this I will just drop it :)
I don't plan to look into this in the next couple of months.
spoiledsport
Rondom
I played around a bit with cross-compiling to Win64 with mingw-w64 by adding the needed "pe-x86-64" in tools/lkl/Makefile and arch/lkl/Makefile.
"interestingly" it fails in two different ways if I add or don't add select 64BIT if OUTPUT_FORMAT = "pe-x86-64" in arch/lkl/Kbuild
Without it, it fails on the compilation check
define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
in include/linux/bug.h
With it, it fails on include/linux/tty.h Width of "unused" is longer than its type unused:BITS_PER_LONG - 2
I have tried setting BITS_PER_LONG=32 manually as a KBUILD_CFLAG (which it should be on Win64)
I am guessing that both of these issues is due to Win64 being LLP64 which means that assumptions in compilation checks etc are not always correct. The question is just - what would be the advisable approach - go for 64bit and try to solve the incompatibilities or rather go for 32bit and try to solve incompatibilities?
If someone smarter than me is already working on this I will just drop it :)