Traditionally, kdump is used to save vmcore in case of a crash. Some
architectures like powerpc can save vmcore using architecture specific
support instead of kexec/kdump mechanism. Such architecture specific
support also needs to reserve memory, to be used by dump capture kernel.
crashkernel parameter can be a reused, for memory reservation, by such
architecture specific infrastructure.
This patchset removes dependency with CONFIG_KEXEC for crashkernel parameter
and vmcoreinfo related code as it can be reused without kexec support. Also,
crashkernel parameter is reused instead of fadump_reserve_mem to reserve
memory for fadump.
The first patch moves crashkernel parameter parsing and vmcoreinfo related
code under CONFIG_CRASH_CORE instead of CONFIG_KEXEC_CORE to reuse without
depending on it. The second patch reuses crashkernel for reserving memory
for fadump instead of fadump_reserve_mem. This has the advantage of using
all the syntaxes crashkernel supports, for fadump as well. The third patch
updates fadump kernel documentation about use of crashkernel parameter.
---
Hari Bathini (3):
crash: move crashkernel parsing and vmcore related code under CONFIG_CRASH_CORE
powerpc/fadump: reuse crashkernel parameter for fadump memory reservation
powerpc/fadump: update documentation about crashkernel parameter reuse
Documentation/powerpc/firmware-assisted-dump.txt | 23 +
arch/Kconfig | 4
arch/ia64/kernel/crash.c | 22 -
arch/powerpc/Kconfig | 10
arch/powerpc/include/asm/fadump.h | 2
arch/powerpc/kernel/crash.c | 2
arch/powerpc/kernel/fadump.c | 57 +--
arch/powerpc/kernel/setup-common.c | 5
include/linux/crash_core.h | 75 ++++
include/linux/kexec.h | 63 ---
kernel/Makefile | 1
kernel/crash_core.c | 450 ++++++++++++++++++++++
kernel/kexec_core.c | 435 ---------------------
13 files changed, 575 insertions(+), 574 deletions(-)
create mode 100644 include/linux/crash_core.h
create mode 100644 kernel/crash_core.c
