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(-) >
