On Tue, Jul 03, 2018 at 11:10:27PM -0400, Benjamin Gilbert wrote: > On Tue, Jul 03, 2018 at 05:21:50PM +0300, Kirill A. Shutemov wrote: > > I don't know how to solve it. As far as I know we don't support compiling > > kernel with LTO in mainline. > > > > Any suggestions? > > > > Benjamin, do you change LDFLAGS or CFLAGS when compiling the kernel? > > We're using the standard build flags as far as I can tell. In particular, > we don't enable LTO, and I've verified that -flto isn't in the build logs. > > Here's a sample image: > > https://users.developer.core-os.net/bgilbert/4.17/vmlinuz-4.17.3-coreos > https://users.developer.core-os.net/bgilbert/4.17/vmlinux-4.17.3-coreos > https://users.developer.core-os.net/bgilbert/4.17/System.map
It's basically the same issue. We have immidiate load instead of RIP-relative address load. You can make the vmlinuz bootable with this binary patch: echo -en "\x8d\x05\xa9\xa9\xff\xff" | dd of=vmlinuz-4.17.3-coreos seek=$((0x005d1fc1)) bs=1 conv=notrunc Now we need to find out how linker gets it wrong. Please, *after* complete build of the kernel with your toolchain do this: touch arch/x86/boot/compressed/pgtable_64.c make V=1 And share your build log. -- Kirill A. Shutemov
