tree ba6910592cb36ccb30f7612cdeee3f0af9cba036
parent d34c5f26cf7de52a72ee064698817a5a39b91767
author Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> 1329354900 +0000
committer Benjamin Herrenschmidt <benh@kernel.crashing.org> 1329954602 +1100

fadump: Introduce cleanup routine to invalidate /proc/vmcore.

With the firmware-assisted dump support we don't require a reboot when we
are in second kernel after crash. The second kernel after crash is a normal
kernel boot and has knowledge about entire system RAM with the page tables
initialized for entire system RAM. Hence once the dump is saved to disk, we
can just release the reserved memory area for general use and continue
with second kernel as production kernel.

Hence when we release the reserved memory that contains dump data, the
'/proc/vmcore' will not be valid anymore. Hence this patch introduces
a cleanup routine that invalidates and removes the /proc/vmcore file. This
routine will be invoked before we release the reserved dump memory area.

Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>