In recent arm64 kernels, /proc/iomem has an extended file format like:
40000000-5871ffff : System RAM
41800000-426affff : Kernel code
426b0000-42aaffff : reserved
42ab0000-42c64fff : Kernel data
54400000-583fffff : Crash kernel
58590000-585effff : reserved
58700000-5871ffff : reserved
58720000-58b5ffff : reserved
58b60000-5be3ffff : System RAM
58b61000-58b61fff : reserved
where "reserved" entries can be an ACPI table, UEFI related code or
data. They can be corrupted and result in early failure in booting
a new kernel. As an actual example, LPI pending table and LPI property
table, which are pointed by a UEFI data, are sometimes destroyed.
They are expected to be preserved across kexec'ing.
Changelog:
v3: - Re-based to the latest commit (bd07796).
- Added Tested-by tag from Bhupesh and Masayoshi
- Added an error handling in case
mem_regions_alloc_and_exclude() fails (0002 patch).
AKASHI Takahiro (3):
kexec: add variant helper functions for handling memory regions
arm64: kexec: allocate memory space avoiding reserved regions
arm64: kdump: deal with a lot of resource entries in /proc/iomem
kexec/arch/arm64/crashdump-arm64.c | 25 ++---
kexec/arch/arm64/kexec-arm64.c | 153 ++++++++++++++++++-----------
kexec/mem_regions.c | 42 ++++++++
kexec/mem_regions.h | 7 ++
4 files changed, 153 insertions(+), 74 deletions(-)
--
2.18.1
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