powerpc: Replace find_linux_pte with find_linux_pte_or_hugepte
Replace find_linux_pte with find_linux_pte_or_hugepte and explicitly
document why we don't need to handle transparent hugepages at callsites.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/kernel/io-workarounds.c b/arch/powerpc/kernel/io-workarounds.c
index 50e90b7..fa0b54b 100644
--- a/arch/powerpc/kernel/io-workarounds.c
+++ b/arch/powerpc/kernel/io-workarounds.c
@@ -55,6 +55,7 @@
struct iowa_bus *iowa_mem_find_bus(const PCI_IO_ADDR addr)
{
+ unsigned hugepage_shift;
struct iowa_bus *bus;
int token;
@@ -70,11 +71,17 @@
if (vaddr < PHB_IO_BASE || vaddr >= PHB_IO_END)
return NULL;
- ptep = find_linux_pte(init_mm.pgd, vaddr);
+ ptep = find_linux_pte_or_hugepte(init_mm.pgd, vaddr,
+ &hugepage_shift);
if (ptep == NULL)
paddr = 0;
- else
+ else {
+ /*
+ * we don't have hugepages backing iomem
+ */
+ WARN_ON(hugepage_shift);
paddr = pte_pfn(*ptep) << PAGE_SHIFT;
+ }
bus = iowa_pci_find(vaddr, paddr);
if (bus == NULL)