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. The second patch
reuses the definitions of append_elf_note() & final_note() functions under
CONFIG_CRASH_CORE in IA64 arch code. The third patch removes dependency on
CONFIG_KEXEC for firmware-assisted dump (fadump) in powerpc. The next patch
reuses crashkernel parameter for reserving memory for fadump, instead of the
fadump_reserve_mem parameter. This has the advantage of using all syntaxes
crashkernel parameter supports, for fadump as well. The last patch updates
fadump kernel documentation about use of crashkernel parameter.
---
Hari Bathini (5):
crash: move crashkernel parsing and vmcore related code under CONFIG_CRASH_CORE
ia64: reuse append_elf_note() and final_note() functions
powerpc/fadump: remove dependency with CONFIG_KEXEC
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 | 69 +++
include/linux/elf.h | 2
include/linux/kexec.h | 57 ---
include/linux/printk.h | 4
kernel/Makefile | 1
kernel/crash_core.c | 439 ++++++++++++++++++++++
kernel/kexec_core.c | 432 ----------------------
kernel/ksysfs.c | 8
kernel/printk/printk.c | 6
17 files changed, 572 insertions(+), 571 deletions(-)
create mode 100644 include/linux/crash_core.h
create mode 100644 kernel/crash_core.c
