Am Thu, 12 Oct 2017 11:37:26 +0100 schrieb Dimitri John Ledkov <xnox@xxxxxxxxxx>: > zipl from s390-tools generates root=/dev/ram0 kernel cmdline for > zfcpdump, thus BLK_DEV_RAM is required. > > zfcpdump initrd mounts DEBUG_FS, thus it is also required. > > Without above two options kernel images built with zfcpdump_defconfig > fail to perform zfcpdump. Affects v4.10+. > > Bug-Ubuntu: https://launchpad.net/bugs/1722735 > Bug-Ubuntu: https://launchpad.net/bugs/1719290 > > Cc: stable@xxxxxxxxxxxxxxx > Signed-off-by: Dimitri John Ledkov <xnox@xxxxxxxxxx> > --- > arch/s390/configs/zfcpdump_defconfig | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/arch/s390/configs/zfcpdump_defconfig b/arch/s390/configs/zfcpdump_defconfig > index afa46a7..04e042e 100644 > --- a/arch/s390/configs/zfcpdump_defconfig > +++ b/arch/s390/configs/zfcpdump_defconfig > @@ -27,6 +27,7 @@ CONFIG_NET=y > CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug" > CONFIG_DEVTMPFS=y > # CONFIG_FIRMWARE_IN_KERNEL is not set > +CONFIG_BLK_DEV_RAM=y In https://launchpad.net/bugs/1722735 was reported that the ramdisk problem was introduced with kernel 4.10. But to me it looks like the kernel config option CONFIG_BLK_DEV_RAM is also not there in kernel 4.9: linux-master ((v4.10))$ git checkout v4.9 Previous HEAD position was c8d2bc9bc39e... Linux 4.8 HEAD is now at 69973b830859... Linux 4.9 linux-master ((v4.9))$ make zfcpdump_defconfig HOSTCC scripts/basic/fixdep # # configuration written to .config # linux-master ((v4.9))$ grep CONFIG_BLK_DEV_RA .config # CONFIG_BLK_DEV_RAM is not set Regards Michael