powerpc: Minor cleanups of kernel virt address space definitions

Make FIXADDR_TOP a compile time constant and cleanup a
couple of definitions relative to the layout of the kernel
address space on ppc32. We also print out that layout at
boot time for debugging purposes.

This is a pre-requisite for properly fixing non-coherent
DMA allocactions.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 2 insertions, 6 deletions

diff --git a/arch/powerpc/mm/init_32.c b/arch/powerpc/mm/init_32.c
index 666a5e8a5be1..3de6a0d93824 100644
--- a/arch/powerpc/mm/init_32.c
+++ b/arch/powerpc/mm/init_32.c
@@ -168,12 +168,8 @@ void __init MMU_init(void)
                 ppc_md.progress("MMU:mapin", 0x301);
         mapin_ram();
 
-#ifdef CONFIG_HIGHMEM
-        ioremap_base = PKMAP_BASE;
-#else
-        ioremap_base = 0xfe000000UL;    /* for now, could be 0xfffff000 */
-#endif /* CONFIG_HIGHMEM */
-        ioremap_bot = ioremap_base;
+        /* Initialize early top-down ioremap allocator */
+        ioremap_bot = IOREMAP_TOP;
 
         /* Map in I/O resources */
         if (ppc_md.progress)