linux-kernel - [PATCH v4 0/5] kexec/fadump: remove dependency with CONFIG_KEXEC and reuse crashkernel parameter for fadump

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Message-Id: <148363729327.11570.6244765717789390817.stgit@hbathini.in.ibm.com>
Date:   Thu, 05 Jan 2017 22:58:42 +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 v4 0/5] 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. 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