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

[Mahesh Jagannath Salgaonkar]

On 08/29/2012 01:54 PM, Mahesh J Salgaonkar wrote:
> 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
> https://lists.ozlabs.org/pipermail/linuxppc-dev/2012-August/100500.html
> now exports memory limit information through /proc/device-tree file.
> The above patch is still in discussion.

The above mentioned kernel patches are now upstream. Below are commit ids:
4bc77a5e - powerpc: Export memory limit via device tree
a84fcd468 - powerpc: Change memory_limit from phys_addr_t to unsigned
long long

> 
> 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(-)
>