[PARISC] Fix BLK_BOUNCE_HIGH on parisc by initializing max_low_pfn

max_low_pfn was not being set in arch/parisc/mm/init.c, causing severe
problems whenever anything tried to use BLK_BOUNCE_HIGH. Set it to
max_pfn like other similar architectures do.

Signed-off-by: Grant Grundler <grundler@parisc-linux.org>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/arch/parisc/mm/init.c b/arch/parisc/mm/init.c
index f2e7f13ddeeb..720287d46e55 100644
--- a/arch/parisc/mm/init.c
+++ b/arch/parisc/mm/init.c
@@ -300,6 +300,13 @@ static void __init setup_bootmem(void)
                         max_pfn = start_pfn + npages;
         }
 
+        /* IOMMU is always used to access "high mem" on those boxes
+         * that can support enough mem that a PCI device couldn't
+         * directly DMA to any physical addresses.
+         * ISA DMA support will need to revisit this.
+         */
+        max_low_pfn = max_pfn;
+
         if ((bootmap_pfn - bootmap_start_pfn) != bootmap_pages) {
                 printk(KERN_WARNING "WARNING! bootmap sizing is messed up!\n");
                 BUG();