Hello Vivek and Hatayama, Currently the /proc/vmcore mmap patches are not working on s390. The problem is that on s390 the kernel in not relocatable and therefore always runs in the lower memory area. Therefore for kdump on s390 we swap the lower memory area with the crashkernel area before starting the kdump kernel: [0 - OLDMEM_SIZE] is mapped to [OLDMEM_BASE - OLDMEM_BASE + OLDMEM_SIZE] To fix /proc/vmcore mmap memory below OLDMEMSIZE needs to be mapped with OLDMEM_BASE as offset. To achieve that, a new weak function arch_oldmem_remap_pfn_range() is introduced. If you agree with our approach, could you integrate the two patches into the mmap patch series? Best Regards, Michael --- Jan Willeke (2): kdump/mmap: Introduce arch_oldmem_remap_pfn_range() s390/kdump/mmap: Implement arch_oldmem_remap_pfn_range() for s390 arch/s390/kernel/crash_dump.c | 27 +++++++++++++++++++++++++++ fs/proc/vmcore.c | 15 ++++++++++++++- include/linux/crash_dump.h | 5 +++++ 3 files changed, 46 insertions(+), 1 deletion(-) -- 1.8.1.6
