vmalloc kernel mapping and relocatable kernel

This patchset originally implemented relocatable kernel support but now
also moves the kernel mapping into the vmalloc zone.

The first patch explains why we need to move the kernel into vmalloc
zone (instead of memcpying it around). That patch should ease KASLR
implementation a lot.

The second patch allows to build relocatable kernels but is not selected
by default.

The third patch takes advantage of an already existing powerpc script
that checks relocations at compile-time, and uses it for riscv.

Alexandre Ghiti (3):
  riscv: Move kernel mapping to vmalloc zone
  riscv: Introduce CONFIG_RELOCATABLE
  arch, scripts: Add script to check relocations at compile time

 arch/powerpc/tools/relocs_check.sh |  18 +----
 arch/riscv/Kconfig                 |  12 +++
 arch/riscv/Makefile                |   5 +-
 arch/riscv/Makefile.postlink       |  36 +++++++++
 arch/riscv/boot/loader.lds.S       |   3 +-
 arch/riscv/include/asm/page.h      |  10 ++-
 arch/riscv/include/asm/pgtable.h   |  37 ++++++---
 arch/riscv/kernel/head.S           |   3 +-
 arch/riscv/kernel/module.c         |   4 +-
 arch/riscv/kernel/vmlinux.lds.S    |   9 ++-
 arch/riscv/mm/Makefile             |   4 +
 arch/riscv/mm/init.c               | 121 +++++++++++++++++++++++++----
 arch/riscv/mm/physaddr.c           |   2 +-
 arch/riscv/tools/relocs_check.sh   |  26 +++++++
 scripts/relocs_check.sh            |  20 +++++
 15 files changed, 258 insertions(+), 52 deletions(-)
 create mode 100644 arch/riscv/Makefile.postlink
 create mode 100755 arch/riscv/tools/relocs_check.sh
 create mode 100755 scripts/relocs_check.sh

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2.20.1