[PATCH 0/5] powerpc/crash: use generic crashkernel reservation

[Sourabh Jain]

Commit 0ab97169aa05 ("crash_core: add generic function to do
reservation") added a generic function to reserve crashkernel memory.
So let's use the same function on powerpc and remove the
architecture-specific code that essentially does the same thing.

The generic crashkernel reservation also provides a way to split the
crashkernel reservation into high and low memory reservations, which can
be enabled for powerpc in the future.

Additionally move powerpc to use generic APIs to locate memory hole for
kexec segments while loading kdump kernel.

Patch series summary:
=====================
Patch 1-2: generic changes
Patch 3-4: powerpc changes
Patch 5:   generic + powerpc changes

Sourabh Jain (5):
  crash: remove an unused argument from reserve_crashkernel_generic()
  crash: let arch decide crash memory export to iomem_resource
  powerpc/kdump: preserve user-specified memory limit
  powerpc/crash: use generic crashkernel reservation
  crash: option to let arch decide mem range is usable

 arch/arm64/mm/init.c                     |   6 +-
 arch/loongarch/kernel/setup.c            |   5 +-
 arch/powerpc/Kconfig                     |   3 +
 arch/powerpc/include/asm/crash_reserve.h |  18 ++
 arch/powerpc/include/asm/kexec.h         |  10 +-
 arch/powerpc/kernel/prom.c               |   2 +-
 arch/powerpc/kexec/core.c                |  96 ++++-----
 arch/powerpc/kexec/file_load_64.c        | 259 +----------------------
 arch/riscv/mm/init.c                     |   6 +-
 arch/x86/kernel/setup.c                  |   6 +-
 include/linux/crash_reserve.h            |  22 +-
 include/linux/kexec.h                    |   9 +
 kernel/crash_reserve.c                   |  12 +-
 kernel/kexec_file.c                      |  12 ++
 14 files changed, 127 insertions(+), 339 deletions(-)
 create mode 100644 arch/powerpc/include/asm/crash_reserve.h

Cc: Andrew Morton <akpm at linux-foundation.org>
Cc: Baoquan he <bhe at redhat.com>
Cc: Hari Bathini <hbathini at linux.ibm.com>
CC: Madhavan Srinivasan <maddy at linux.ibm.com>
Cc: Michael Ellerman <mpe at ellerman.id.au>
Cc: kexec at lists.infradead.org
Cc: linux-kernel at vger.kernel.org
Cc: sourabhjain at linux.ibm.com

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2.47.1