linux-kernel - [PATCH 0/3] kexec/fadump: remove dependency with CONFIG_KEXEC and reuse crashkernel parameter for fadump

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Date:   Thu, 10 Nov 2016 17:27:10 +0530
From:   Hari Bathini <hbathini@...ux.vnet.ibm.com>
To:     linux-kernel@...r.kernel.org
Cc:     fenghua.yu@...el.com, tony.luck@...el.com,
        linux-ia64@...r.kernel.org, dyoung@...hat.com,
        kexec@...ts.infradead.org,
        Mahesh J Salgaonkar <mahesh@...ux.vnet.ibm.com>,
        ebiederm@...ssion.com, Michael Ellerman <mpe@...erman.id.au>,
        linuxppc-dev@...ts.ozlabs.org, vgoyal@...hat.com
Subject: [PATCH 0/3] kexec/fadump: remove dependency with CONFIG_KEXEC and
 reuse crashkernel parameter for fadump

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