[PATCH 0/2] kexec: Limit the crash memory ranges according to first kernel's memory limit.

Mahesh J Salgaonkar mahesh at linux.vnet.ibm.com
Wed Aug 29 04:24:35 EDT 2012

So far powerpc kernel never exported memory limit information which is
reflected by mem= kernel cmdline option. Hence, kexec-tools always use
to build ELF header for entire system RAM generating a dump bigger than
the actual memory used by the first kernel.

The proposed upstream kernel patch at
now exports memory limit information through /proc/device-tree file.
The above patch is still in discussion.

This patch series now reads the memory limit information from
device-tree file if present and limits the crash memory ranges accordingly.

Tested these patches on ppc32(ppc440) and ppc64 with a kernel patch by Suzuki.

Signed-off-by: Mahesh Salgaonkar <mahesh at linux.vnet.ibm.com>
Tested-by: Suzuki K. Poulose <suzuki at in.ibm.com>


Mahesh Salgaonkar (2):
      kexec: Respect memory limit while building crash memory ranges on ppc32.
      kexec: Respect memory limit while building crash memory ranges on ppc64

 kexec/arch/ppc/crashdump-powerpc.c |   14 ++++++++---
 kexec/arch/ppc/crashdump-powerpc.h |    1 +
 kexec/arch/ppc/kexec-ppc.c         |   48 ++++++++++++++++++++++++++++++++++++
 kexec/arch/ppc64/crashdump-ppc64.c |   11 ++++++++
 kexec/arch/ppc64/crashdump-ppc64.h |    1 +
 kexec/arch/ppc64/kexec-ppc64.c     |   28 +++++++++++++++++++++
 6 files changed, 99 insertions(+), 4 deletions(-)


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