Re: [Linux-stable-mirror] [PATCH 4.14 023/159] mm/sparsemem: Allocate mem_section at runtime for CONFIG_SPARSEMEM_EXTREME=y

On Mon, Jan 08, 2018 at 04:04:44PM +0000, Ingo Molnar wrote:

hi Kirill,

As Mike reported it below, your 5-level paging related upstream commit 83e3c48729d9 and all its followup fixes:

83e3c48729d9: mm/sparsemem: Allocate mem_section at runtime for CONFIG_SPARSEMEM_EXTREME=y 629a359bdb0e: mm/sparsemem: Fix ARM64 boot crash when CONFIG_SPARSEMEM_EXTREME=y d09cfbbfa0f7: mm/sparse.c: wrong allocation for mem_section

... still breaks kexec - and that now regresses -stable as well.

Given that 5-level paging now syntactically depends on having this commit, if we fully revert this then we'll have to disable 5-level paging as well.

Urghh.. Sorry about this.

I'm on vacation right now. Give me a day to sort this out.