Dan Williams <dan.j.williams@xxxxxxxxx> writes: >> What problems with 5.4.y and 5.6.y is this series fixing >> that used to work before? > > The "used to work" bug fixed by this set is the fact that the kernel > used to force a 128MB (memory hotplug section size) alignment padding > on all persistent memory namespaces to enable DAX operation. The > support for sub-sections (2MB) dropped forced alignment padding, but > unfortunately introduced a regression for the case of trying to create > multiple unaligned namespaces. When that bug triggers namespace > creation for the region is disabled, iirc, previously that lockout > scenario was prevented. > > Jeff, can you corroborate this? So, I don't pretend to remember the exact state of brokenness for each iteration. :) As far as I can recall, though, the issue you describe with a misaligned namespace preventing further namespace creation was present in all kernels up until it was finally fixed. > I otherwise agree, if the above never worked then this can all wait > for v5.7 upgrades. I can test specific kernel versions if that would help out. Cheers, Jeff
