[PATCHv4 0/4] x86: 5-level related changes into decompression code

[Kirill A. Shutemov]

Hi,

Here's few changes to x86 decompression code.

The first patch fixes build regression introduced by my recent patch.
It only triggers when KASLR disabled and GCC version < 5. I haven't
noticed this before.

The second patch is pure cosmetic change: give file with KASLR helpers
a proper name.

The last two patches bring support of booting into 5-level paging mode if
a bootloader put the kernel above 4G.

Patch 3/4 handles allocation of space for trampoline and gets it prepared.
Patch 4/4 gets trampoline used.

Please review and consider applying.

Kirill A. Shutemov (4):
  x86/boot/compressed/64: Fix build with GCC < 5
  x86/boot/compressed/64: Rename pagetable.c to kaslr_64.c
  x86/boot/compressed/64: Introduce place_trampoline()
  x86/boot/compressed/64: Handle 5-level paging boot if kernel is above
    4G

 arch/x86/boot/compressed/Makefile                  |   2 +-
 arch/x86/boot/compressed/head_64.S                 | 130 +++++++++++++--------
 .../boot/compressed/{pagetable.c => kaslr_64.c}    |   3 -
 arch/x86/boot/compressed/pgtable.h                 |  18 +++
 arch/x86/boot/compressed/pgtable_64.c              |  75 ++++++++++--
 5 files changed, 163 insertions(+), 65 deletions(-)
 rename arch/x86/boot/compressed/{pagetable.c => kaslr_64.c} (97%)
 create mode 100644 arch/x86/boot/compressed/pgtable.h

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2.15.0