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Subject[PATCH v5 0/3] Add restrictions for kexec/kdump jumping between 5-level and 4-level kernel

The v4 cover letter tells the background about this adding, paste the
link here for reference:

Tune code and log per Dave's comments, no functional change.
- In patch 2, change the printed erorr message;
- In patch 3, add macro SZ_64T and use it in code, and remove the
obsolete code comment.
No functional change.
- Rewrite log of patch 1/3 tell who the newly added bits are gonna be
- Rewrite log of patch 2/3 per tglx's words.
- Add Kirill's Acked-by.

Change the constant to match the notation for the rest of defines as
Kirill suggested;
Correct the subject of patch 1 according to tglx's comment;
Add more information to cover-letter to address reviewers' concerns;

Baoquan He (3):
x86/boot: Add xloadflags bits for 5-level kernel checking
x86/kexec/64: Error out if try to jump to old 4-level kernel from
5-level kernel
x86/kdump/64: Change the upper limit of crashkernel reservation

arch/x86/boot/header.S | 12 +++++++++++-
arch/x86/include/uapi/asm/bootparam.h | 2 ++
arch/x86/kernel/kexec-bzimage64.c | 5 +++++
arch/x86/kernel/setup.c | 15 ++++++++++++---
include/linux/sizes.h | 1 +
5 files changed, 31 insertions(+), 4 deletions(-)


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