[PATCH v5 0/9] Add generic support for kdump DT properties

[Geert Uytterhoeven <geert+renesas@glider.be>]

	Hi all,

This patch series adds generic support for parsing DT properties related
to crash dump kernels ("linux,elfcorehdr" and "linux,elfcorehdr" under
the "/chosen" node), makes use of it on arm32, and performs a few
cleanups.  It is an evolution of the combination of [1] and [2].

The series consists of 6 parts:
  1. Patch 1 prepares architecture-specific code (needed for MIPS only)
     to avoid duplicating elf core header reservation later.
  2. Patch 2 prepares the visibility of variables used to hold
     information retrieved from the DT properties.
  3. Patches 3-5 add support to the FDT core for handling the
     properties.
     This can co-exist safely with architecture-specific handling, until
     the latter has been removed.
  4. Patch 6 removes the non-standard handling of "linux,elfcorehdr" on
     riscv.
  5. Patches 7-8 convert arm64 to use the generic handling instead of
     its own implementation.
  6. Patch 9 adds support for kdump properties to arm32.
     The corresponding patch for kexec-tools is "[PATCH] arm: kdump: Add
     DT properties to crash dump kernel's DTB"[3], which is still valid.

Changes compared to v4[4]:
  - New patch "[PATCH v5 1/9] MIPS: Avoid future duplicate elf core
    header reservation",
  - Drop "memblock: Add variables for usable memory limitation", as this
    is now handled in FDT core code,
  - Make ELFCORE_ADDR_{MAX,ERR} visible, too,
  - Handle the actual elf core header reservation and memory capping in
    FDT core code,
  - Add Reviewed-by, Acked-by,
  - Remove all architecture-specific handling on arm64,
  - Drop "arm64: kdump: Use IS_ENABLED(CONFIG_CRASH_DUMP) instead of
    #ifdef", as the affected code is gone,
  - Remove the addition of "linux,elfcorehdr" and
    "linux,usable-memory-range" handling to arch/arm/mm/init.c.

Changes compared to older versions:
  - Make elfcorehdr_{addr,size} always visible,
  - Add variables for usable memory limitation,
  - Use IS_ENABLED() instead of #ifdef (incl. initrd and arm64),
  - Clarify what architecture-specific code is still responsible for,
  - Add generic support for parsing linux,usable-memory-range,
  - Remove custom linux,usable-memory-range parsing on arm64,
  - Use generic handling on ARM.
  
This has been tested with kexec/kdump on arm32 and arm64, and
boot-tested on riscv64 and DT-less MIPS.

Thanks!

[1] "[PATCH v3] ARM: Parse kdump DT properties"
    https://lore.kernel.org/r/20210317113130.2554368-1-geert+renesas@glider.be/
[2] "[PATCH 0/3] Add generic-support for linux,elfcorehdr and fix riscv"
    https://lore.kernel.org/r/cover.1623780059.git.geert+renesas@glider.be/
[3] "[PATCH] arm: kdump: Add DT properties to crash dump kernel's DTB"
    https://lore.kernel.org/r/20200902154129.6358-1-geert+renesas@glider.be/
[4] "[PATCH v4 00/10] Add generic support for kdump DT properties"
    https://lore.kernel.org/r/cover.1626266516.git.geert+renesas@glider.be

Geert Uytterhoeven (9):
  MIPS: Avoid future duplicate elf core header reservation
  crash_dump: Make elfcorehdr address/size symbols always visible
  of: fdt: Add generic support for handling elf core headers property
  of: fdt: Add generic support for handling usable memory range property
  of: fdt: Use IS_ENABLED(CONFIG_BLK_DEV_INITRD) instead of #ifdef
  riscv: Remove non-standard linux,elfcorehdr handling
  arm64: kdump: Remove custom linux,elfcorehdr handling
  arm64: kdump: Remove custom linux,usable-memory-range handling
  ARM: uncompress: Parse "linux,usable-memory-range" DT property

 Documentation/devicetree/bindings/chosen.txt  | 12 +--
 .../arm/boot/compressed/fdt_check_mem_start.c | 48 ++++++++--
 arch/arm64/mm/init.c                          | 88 -----------------
 arch/mips/kernel/setup.c                      |  3 +-
 arch/riscv/mm/init.c                          | 20 ----
 drivers/of/fdt.c                              | 94 +++++++++++++++++--
 include/linux/crash_dump.h                    |  3 +-
 7 files changed, 139 insertions(+), 129 deletions(-)

-- 
2.25.1

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds