Messages in this thread | | | Subject | Re: REGRESSION: 8fc5b4d: Unable to compile x86_64 kernel with x86_32 userland | From | "H. Peter Anvin" <> | Date | Wed, 20 Aug 2014 10:07:01 -0500 |
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It says "32-bit mode" which means it is another issue: we are dropping -m64 at some point.
On August 20, 2014 7:56:30 AM CDT, Vivek Goyal <vgoyal@redhat.com> wrote: >On Wed, Aug 20, 2014 at 08:24:08AM +0200, Thomas Glanzmann wrote: >> Hello Vivek, >> commit 8fc5b4d introduces a regression that no longer allows to >compile >> x86_64 kernel under x86_32 userland. TJ on freenode/#kernel did >analyze >> it: >> >> > (mini) [~/work/linux-2.6] make >> > scripts/kconfig/conf --silentoldconfig Kconfig >> > CHK include/config/kernel.release >> > UPD include/config/kernel.release >> > CHK include/generated/uapi/linux/version.h >> > CHK include/generated/utsrelease.h >> > UPD include/generated/utsrelease.h >> > CC arch/x86/purgatory/purgatory.o >> > arch/x86/purgatory/purgatory.c:1:0: error: code model 'large' not >supported in the 32 bit mode >> > make[1]: *** [arch/x86/purgatory/purgatory.o] Error 1 >> > make: *** [archprepare] Error 2 >> >> 08:10 < TJ-> Glanzmann: The purgatory code from kexec is specifying >".code64" >> 08:11 < TJ-> Glanzmann: so when your local 32-bit linker tries to >deal with that ... it errors >> 08:14 < TJ-> Glanzmann: there's only one introducing the purgatory >stuff >> 08:14 < TJ-> 8fc5b4d Fri Aug 8 15:57:32 2014 -0700 Vivek Goyal >purgatory: core purgatory functionality > >Hi Thomas, > >Thanks for the report. I think this is also happening because purgatory >is >right now being compiled with compiler option -mcmodel=large. There was >another report where older version of gcc did not support >-mcmodel=large. > >A patch is sitting in akpm's tree. That patch puts the new code under >a new config option CONFIG_KEXEC_FILE. So as long as you don't enable >CONFIG_KEXEC_FILE=y, you should be fine. This should not impact any of >the existing functionality. Just that you will not get the benefit of >new system call. > >http://ozlabs.org/~akpm/mmotm/broken-out/kexec-create-a-new-config-option-config_kexec_file-for-new-syscall.patch > >I hope this patch gets merged soon. > >In the mean time I am trying to figure out how can I move away from >using -mcmodel=large for purgatory. > >Thanks >Vivek
-- Sent from my mobile phone. Please pardon brevity and lack of formatting.
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