diff options
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/platforms/powernv/pci-ioda.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c index 77083274a4e3..414fd1a00fda 100644 --- a/arch/powerpc/platforms/powernv/pci-ioda.c +++ b/arch/powerpc/platforms/powernv/pci-ioda.c @@ -2050,12 +2050,18 @@ static long pnv_pci_ioda2_setup_default_config(struct pnv_ioda_pe *pe) long rc; /* + * crashkernel= specifies the kdump kernel's maximum memory at + * some offset and there is no guaranteed the result is a power + * of 2, which will cause errors later. + */ + const u64 max_memory = __rounddown_pow_of_two(memory_hotplug_max()); + + /* * In memory constrained environments, e.g. kdump kernel, the * DMA window can be larger than available memory, which will * cause errors later. */ - const u64 window_size = min((u64)pe->table_group.tce32_size, - memory_hotplug_max()); + const u64 window_size = min((u64)pe->table_group.tce32_size, max_memory); rc = pnv_pci_ioda2_create_table(&pe->table_group, 0, IOMMU_PAGE_SHIFT_4K, |