On Thu, 13 Feb 2014 10:17:10 +0100 Christian Borntraeger <borntrae...@de.ibm.com> wrote:
> We have to set the cssid to 0, otherwise the stsch code will > return an operand exception without the m bit. In the same way > we should set m=0. > > This case was triggered in some cases during reboot, if for some > reason the location of blk_schid.cssid contains 1 and m was 0. > Turns out that the qemu elf loader does not zero out the bss section. > On first boot this is ok, but on reboots this might fail. > > The symptom was an dump of the old kernel with several areas > overwritten. The bootloader does not register a program check > handler, so bios exception jumped back into the old kernel. > > Lets just use a local struct with a designed initializer. That > will guarantee that all other subelements are initialized to 0. > > Signed-off-by: Christian Borntraeger <borntrae...@de.ibm.com> > --- > pc-bios/s390-ccw/main.c | 3 +-- > 1 file changed, 1 insertion(+), 2 deletions(-) Reviewed-by: Cornelia Huck <cornelia.h...@de.ibm.com>
