[PATCH 1/2] kdump: Allow shrinking of kdump region to be overridden

[Mahesh J Salgaonkar]

On Tue, Mar 15, 2011 at 03:52:38PM +0800, Américo Wang wrote:
> On Tue, Mar 15, 2011 at 2:13 AM, Mahesh J Salgaonkar
> <mahesh at linux.vnet.ibm.com> wrote:
> >
> > During free we do free all of them including RMO region. But since the rtas
> > region is always on top of RMO, crashkernel memory overlaps rtas region and
> > we endup freeing that even, which is causing the crash.
> >
> 
> Okay, but with this patch applied, we will just ignore rtas region, right?
Correct.
> Thus, when I echo 0 to free all the 128M crashkernel memory, the final
> result will be 32M left, which means crash_size will still show 32M.
> This looks odd.
> 
> How about skipping the 32M as a whole? I mean once the region being freed
> has overlap with this rtas region, skip the whole rtas region, and let
> crash_size
> show 0?
The existing code from crash_shrink_memory() function reduces the crash
size to 0 when echo'ed 0. I did test this patchset and verified that
/sys/kernel/kexec_crash_size show 0 value.

Thanks,
-Mahesh.
> 
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-- 
Signed-off-by: Mahesh Salgaonkar <mahesh at linux.vnet.ibm.com>