[v6,0/5] Fixmap support and MM cleanups

Message

Anup Patel Feb. 13, 2019, 11:53 a.m. UTC

This patchset does:
1. Moves MM related code from kernel/setup.c to mm/init.c
2. Implements compile-time fixed mappings

Using fixed mappings, we get earlyprints even without SBI calls.

For example, we can now use kernel parameter
"earlycon=uart8250,mmio,0x10000000"
to get early prints on QEMU virt machine without using SBI calls.

The patchset is tested on QEMU virt machine. It is based on
Linux-5.0-rc6 and can be found at riscv_fixmap_v6 branch of:
https://github.com/avpatel/linux.git.

Changes since v5:
 - Drop PATCH1. Instead move setup_initrd() to mm/init.c along
   with setup_bootmem()

Changes since v4:
 - Use free_reserved_area() instead of memblock_free() in PATCH6

Changes since v3:
 - Re-worked and simplified PATCH6

Changes since v2:
 - Fixed commit description of PATCH6
 - Ensured commit description of all PATCH use upto 72
   characters per line

Changes since v1:
 - Use more characters per line in changelog of PATCH3
 - Removed #ifndef __ASSEMBLY__ from PATCH5
 - Use more characters per line in commets of PATCH5
 - Added PATCH6 to implement keepinitrd kernel parameter

Anup Patel (5):
  RISC-V: Setup init_mm before parse_early_param()
  RISC-V: Move setup_bootmem() to mm/init.c
  RISC-V: Move setup_vm() to mm/init.c
  RISC-V: Implement compile-time fixed mappings
  RISC-V: Free-up initrd in free_initrd_mem()

 arch/riscv/Kconfig               |   3 +
 arch/riscv/include/asm/fixmap.h  |  44 +++++++++
 arch/riscv/include/asm/pgtable.h |   1 +
 arch/riscv/kernel/setup.c        | 130 +-------------------------
 arch/riscv/mm/init.c             | 156 ++++++++++++++++++++++++++++++-
 5 files changed, 207 insertions(+), 127 deletions(-)
 create mode 100644 arch/riscv/include/asm/fixmap.h