Sachin Sant <sachinp@xxxxxxxxxxxxxxxxxx> writes: >> The patch below might work. Sachin can you test this? I tried faking up >> a system with a memoryless node zero but couldn't get it to even start >> booting. >> > The patch did not help. The kernel crashed during > the boot with the same call trace. > > BUG_ON() introduced with the patch was not triggered. OK, that's weird. I eventually managed to get a memoryless node going in sim, and it appears to work there. eg in dmesg: [ 0.000000][ T0] numa: NODE_DATA [mem 0x2000fffa2f80-0x2000fffa7fff] [ 0.000000][ T0] numa: NODE_DATA(0) on node 1 [ 0.000000][ T0] numa: NODE_DATA [mem 0x2000fff9df00-0x2000fffa2f7f] ... [ 0.000000][ T0] Early memory node ranges [ 0.000000][ T0] node 1: [mem 0x0000000000000000-0x00000000ffffffff] [ 0.000000][ T0] node 1: [mem 0x0000200000000000-0x00002000ffffffff] [ 0.000000][ T0] Could not find start_pfn for node 0 [ 0.000000][ T0] Initmem setup node 0 [mem 0x0000000000000000-0x0000000000000000] [ 0.000000][ T0] On node 0 totalpages: 0 [ 0.000000][ T0] Initmem setup node 1 [mem 0x0000000000000000-0x00002000ffffffff] [ 0.000000][ T0] On node 1 totalpages: 131072 # dmesg | grep set_numa [ 0.000000][ T0] set_numa_mem: mem node for 0 = 1 [ 0.005654][ T0] set_numa_mem: mem node for 1 = 1 So is the problem more than just node zero having no memory? cheers
