[PATCH v2 0/2] kexec: Limit the crash memory ranges according to first kernel's memory limit.

[Simon Horman]

On Tue, Feb 12, 2013 at 04:16:50PM +0530, 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 following upstream kernel commits now exports memory limit information
> through /proc/device-tree file:
>   4bc77a5ed - 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.
> 
> Changes in v2:
> - Fixed few formatting and coding style issues.
> - Fixed error handling path and possible buffer overflow issue in patch 1/2.
> - Fixed an issue where an additional PT_LOAD section, representing zero size
>   memory segment (with start address == memory_limit), was getting added to ELF
>   section.
> 
> Signed-off-by: Mahesh Salgaonkar <mahesh at linux.vnet.ibm.com>
> Tested-by: Suzuki K. Poulose <suzuki at in.ibm.com>

Thanks, both patches applied.