On Fri, Nov 13 2015, Harald Hoyer wrote: > On 13.11.2015 13:37, Harald Hoyer wrote: >> On 12.10.2015 22:30, Neil Brown wrote: >>> Harald Hoyer <harald@xxxxxxxxxx> writes: >>> >>>> On 12.10.2015 05:02, Neil Brown wrote: >>>>> >>>>> If I have booted a kernel with md/raid built in (no modules) and >>>>> I use dracut to build the initramfs for a different kernel which >>>>> has the md code compiled as separate modules, then it does not include >>>>> the required md modules in the initramfs. >>>>> >>>>> As a particular instance this happen when the root filesystem is on >>>>> RAID0. The 'raid0.ko' module is not included and boot fails. >>>>> >>>>> https://bugzilla.opensuse.org/show_bug.cgi?id=935993 >>>>> >>>>> This only happens when 'host-only' is selected (which is the default for >>>>> openSUSE). >>>>> >>>>> the modules.d/90mdraid/module-setup.sh code calls >>>>> >>>>> instmods =drivers/md >>>>> >>>>> instmods calls >>>>> module_is_host_only "raid0" >>>>> and this incorrectly fails. >>>>> >>>>> If raid0.ko didn't have any alias this would succeed, but it does. >>>>> >>>>> $ modinfo -F alias raid0 >>>>> md-level-0 >>>>> md-raid0 >>>>> md-personality-2 >>>> >>>> Huh? Is the module not loaded? >>> >>> No, because the running kernel has "md/raid built in (no modules)". >>> >>> Thanks, >>> NeilBrown >>> >>>> >>>>> >>>>> However these aliases don't appear in any modalias file in /sys/devices, >>>>> in /proc/crypto, or in /proc/modules. >>>>> >>>>> Maybe you could parse /proc/mdstat.. >>>>> >>>>> if [ -f /proc/mdstat ]; then >>>>> while read _d _c _a _m _x; do >>>>> if [ "$_c" = ':' -a "$_a" = 'active' ]; then >>>>> host_modalias["md-$_m"]=1 >>>>> fi >>>>> done < /proc/mdstat >>>>> fi >>>>> >>>>> but it all seems rather fragile. There are probably other modules that >>>>> might miss out accidentally. dm? >>>>> >>>>> Do we really need the host_modalias stuff? >>>>> >>>>> Thanks, >>>>> NeilBrown >>>>> >> >> Interesting... so we have to blow up the initramfs with the entire drivers/md >> in the case, where you switch from "compiled in" to "not compiled in".. >> >> I guess that happens not that often, so better be safe than sorry. > > remove host_modalias > > <https://github.com/haraldh/dracut/commit/07a081f352497258862ae164d11d9e6dc2c5b959> Thanks a lot for resolving this! NeilBrown
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