Re: Error building Kernel 5.4.291 due new code in xen/mmu_pv.c, running Lubuntu 18.04 i686, gcc 14.2

On 19.03.25 05:06, ofbarea wrote:

[1.] One line summary of the problem: Kernel 5.4.291 fails to build on i686 linux target due to problematic new code in x86/xen/mmu_pv.c [2.] Full description of the problem/report: when building Kernel 5.4.291 under Lubuntu 18.6.6 LTS, with GCC 14.2, i686 target, build fails due to changes introduced in "arch/x86/xen/mmu_pv.c"

Note - I did not determined what of the following changes caused the issue:

Juergen Gross (1): x86/xen: allow larger contiguous memory regions in PV guests

This one is to blame. The backport to 5.4 stable didn't account for the 32-bit PV support in this kernel version (32-bit PV support was removed in 5.9).

Juergen