[PATCH 0/4] kdump: Allow ELF header creation in new kernel
vgoyal at redhat.com
Tue May 7 12:37:01 EDT 2013
On Mon, May 06, 2013 at 03:09:55PM +0200, Michael Holzheu wrote:
> Hello Vivek,
> For s390 we want to use /proc/vmcore for our SCSI stand-alone
> dump (zfcpdump). We have support where the first HSA_SIZE bytes are
> saved into a hypervisor owned memory area (HSA) before the kdump
> kernel is booted. When the kdump kernel starts, it is restricted
> to use only HSA_SIZE bytes.
Hatayama is changing /proc/vmcore interface to support mmap(). Can you
please rebase your changes on top of those patches.
Secondly, I think /proc/vmcore does not have to know whether elf
headers are in old memory or new memory. Given that s390 is taking
a deviation, so it now becomes an arch specific detail. Can't we
just create few arch specific helper functions to retrieve and free
- All arch except return elfcorehdr_add except s390.
- All arch just call into read_from_oldmem() except s390. We
can provide a generic implementation in /proc/vmcore.c so
all other arch can use that generic implementation. Or
use symbol override trick.
- All arch do nothing except s390 which can reclaim the memory
for elf headers prepared. Generic code has parsed/copied the
headers by now.
What do you think? Above 3 calls should solve the problem and allow
arch to handle elf headers differently. And generic implementation
still keeps common logic for processing headers.
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