[PATCH] mspec driver build fix

Fix MSPEC driver to build for non SN2 enabled configs as the driver should
work in cached and uncached modes (no fetchop) on these systems.  In
addition make MSPEC select IA64_UNCACHED_ALLOCATOR, which is required for
it and move it to arch/ia64/Kconfig to avoid warnings on non ia64
architectures running allmodconfig.  Once the Kconfig code is fixed, we can
move it back.

Signed-off-by: Jes Sorensen <jes@sgi.com>
Cc: Fernando Luis Vzquez Cao <fernando@oss.ntt.co.jp>
Cc: "Luck, Tony" <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/char/mspec.c

@@ -72,7 +72,11 @@ enum {
 	MSPEC_UNCACHED
 };
 
+#ifdef CONFIG_SGI_SN
 static int is_sn2;
+#else
+#define is_sn2		0
+#endif
 
 /*
  * One of these structures is allocated when an mspec region is mmaped. The
@@ -211,7 +215,7 @@ mspec_nopfn(struct vm_area_struct *vma, unsigned long address)
 	if (vdata->type == MSPEC_FETCHOP)
 		paddr = TO_AMO(maddr);
 	else
-		paddr = __pa(TO_CAC(maddr));
+		paddr = maddr & ~__IA64_UNCACHED_OFFSET;
 
 	pfn = paddr >> PAGE_SHIFT;
 
@@ -335,6 +339,7 @@ mspec_init(void)
 	 * The fetchop device only works on SN2 hardware, uncached and cached
 	 * memory drivers should both be valid on all ia64 hardware
 	 */
+#ifdef CONFIG_SGI_SN
 	if (ia64_platform_is("sn2")) {
 		is_sn2 = 1;
 		if (is_shub2()) {
@@ -363,6 +368,7 @@ mspec_init(void)
 			goto free_scratch_pages;
 		}
 	}
+#endif
 	ret = misc_register(&cached_miscdev);
 	if (ret) {
 		printk(KERN_ERR "%s: failed to register device %i\n",