parisc: dma: Add prototype for pcxl_dma_start

Signed-off-by: Helge Deller <deller@gmx.de>

arch/parisc/include/asm/dma.h

@@ -14,6 +14,8 @@
 #define dma_outb	outb
 #define dma_inb		inb
 
+extern unsigned long pcxl_dma_start;
+
 /*
 ** DMA_CHUNK_SIZE is used by the SCSI mid-layer to break up
 ** (or rather not merge) DMAs into manageable chunks.

arch/parisc/kernel/pci-dma.c

@@ -39,7 +39,7 @@ static struct proc_dir_entry * proc_gsc_root __read_mostly = NULL;
 static unsigned long pcxl_used_bytes __read_mostly;
 static unsigned long pcxl_used_pages __read_mostly;
 
-extern unsigned long pcxl_dma_start; /* Start of pcxl dma mapping area */
+unsigned long pcxl_dma_start __ro_after_init; /* pcxl dma mapping area start */
 static DEFINE_SPINLOCK(pcxl_res_lock);
 static char    *pcxl_res_map;
 static int     pcxl_res_hint;

arch/parisc/mm/init.c

@@ -523,10 +523,6 @@ void mark_rodata_ro(void)
 void *parisc_vmalloc_start __ro_after_init;
 EXPORT_SYMBOL(parisc_vmalloc_start);
 
-#ifdef CONFIG_PA11
-unsigned long pcxl_dma_start __ro_after_init;
-#endif
-
 void __init mem_init(void)
 {
 	/* Do sanity checks on IPC (compat) structures */