This series addresses the kexec/kdump crash on arm64 system with many CPUs
that was reported by Bhupesh.
Patch #1 fixes the actual crash, but may result in memblock_reserve() to
fail. This is fixed in patch #4, where the point that the persistent
reservations are applied is moved to after memblock_allow_resize() has
been called.
Patches #2 and #3 contain some minor preparatory changes that are
required on ARM to ensure that efi_apply_persistent_mem_reservations()
can be called at some point (i.e., when memblock resizing is already
permitted and early memremap() is still usable)
Patches #5 and #6 optimize the EFI persistent memreserve infrastructure
so that fewer memblock reservations are required.
Changes since v1:
- Russell pointed out that switching to ordinary memremap() was not
possible this early, and so I refactored the ARM early boot code
slightly so that we can keep using early_memremap().
Ard Biesheuvel (6):
arm64: memblock: don't permit memblock resizing until linear mapping
is up
ARM: mm: permit memblock resizing right after mapping the linear
region
ARM: mm: permit early_memremap() to be used in paging_init()
efi/arm: defer persistent reservations until after paging_init()
efi: permit multiple entries in persistent memreserve data structure
efi: reduce the amount of memblock reservations for persistent
allocations
arch/arm/kernel/setup.c | 2 -
arch/arm/mm/init.c | 1 -
arch/arm/mm/mmu.c | 5 ++
arch/arm64/kernel/setup.c | 1 +
arch/arm64/mm/init.c | 2 -
arch/arm64/mm/mmu.c | 2 +
drivers/firmware/efi/efi.c | 59 ++++++++++++++------
drivers/firmware/efi/libstub/arm-stub.c | 2 +-
include/linux/efi.h | 23 +++++++-
9 files changed, 72 insertions(+), 25 deletions(-)
--
2.19.1
