Hi Palmer,

Le 6/7/20 à 3:59 AM, Alexandre Ghiti a écrit :
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 and fourth patches take advantage of an already existing powerpc
script that checks relocations at compile-time, and uses it for riscv.
Changes in v5:
   * Add "static __init" to create_kernel_page_table function as reported by
     Kbuild test robot
   * Add reviewed-by from Zong
   * Rebase onto v5.7

Changes in v4:
   * Fix BPF region that overlapped with kernel's as suggested by Zong
   * Fix end of module region that could be larger than 2GB as suggested by Zong
   * Fix the size of the vm area reserved for the kernel as we could lose
     PMD_SIZE if the size was already aligned on PMD_SIZE
   * Split compile time relocations check patch into 2 patches as suggested by 
   * Applied Reviewed-by from Zong and Anup
Changes in v3:
   * Move kernel mapping to vmalloc
Changes in v2:
   * Make RELOCATABLE depend on MMU as suggested by Anup
   * Rename kernel_load_addr into kernel_virt_addr as suggested by Anup
   * Use __pa_symbol instead of __pa, as suggested by Zong
   * Rebased on top of v5.6-rc3
   * Tested with sv48 patchset
   * Add Reviewed/Tested-by from Zong and Anup

Alexandre Ghiti (4):
   riscv: Move kernel mapping to vmalloc zone
   riscv: Introduce CONFIG_RELOCATABLE
   powerpc: Move script to check relocations at compile time in scripts/
   riscv: 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   |  38 ++++++---
  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, 259 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

Do you have any remark regarding this series ?



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