On Wed, 2016-11-05 at 09:22:18 UTC, Oliver O'Halloran wrote: > The mm zone mechanism was traditionally used by arch specific code to > partition memory into allocation zones. However there are several zones > that are managed by the mm subsystem rather than the architecture. Most > architectures set the max PFN of these special zones to zero, however on > powerpc we set them to ~0ul. This, in conjunction with a bug in > free_area_init_nodes() results in all of system memory being placed in > ZONE_DEVICE when enabled. Device memory cannot be used for regular kernel > memory allocations so this will cause a kernel panic at boot. Given the > planned addition of more mm managed zones (ZONE_CMA) we should aim to be > consistent with every other architecture and set the max PFN for these > zones to zero. > > Signed-off-by: Oliver O'Halloran <oohall@xxxxxxxxx> > Reviewed-by: Balbir Singh <bsingharora@xxxxxxxxx> > Cc: linux-mm@xxxxxxxxx Applied to powerpc next, thanks. https://git.kernel.org/powerpc/c/3079abe555511031e2ba5d1e21 cheers -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>