On 08/10/2018 08:55 AM, Rashmica Gupta wrote: > On Fri, Aug 10, 2018 at 11:12 AM, Andrew Morton > <akpm@xxxxxxxxxxxxxxxxxxxx> wrote: >> >> What is the end-user impact of this patch? >> > > Only architectures/setups that allow the user to remove and add memory of > different sizes or different start addresses from the kernel at runtime will > potentially encounter the resource fragmentation. > > Trying to remove memory that overlaps iomem resources the first time > gives us this warning: "Unable to release resource <%pa-%pa>". > > Attempting a second time results in a kernel oops (on ppc at least). An oops? I think that should be investigated and fixed, even if resource merging prevents it. Do you have the details? Thanks, Vlastimil
