kdump: use is_kdump_kernel() in sba_init()

o Make use of is_kdump_kernel() rather than checking elfcorehdr_addr directly.

o Remove CONFIG_CRASH_DUMP as is_kdump_kernel() is safe to call anywhere

o Remove CONFIG_PROC_FS as it is bogus, the check
  should occur regardless of if CONFIG_PROC_FS is set or not.
Signed-off-by: NSimon Horman <horms@verge.net.au>
Acked-by: NVivek Goyal <vgoyal@redhat.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

arch/ia64/hp/common/sba_iommu.c

@@ -2070,14 +2070,13 @@ sba_init(void)
 	if (!ia64_platform_is("hpzx1") && !ia64_platform_is("hpzx1_swiotlb"))
 		return 0;
 
-#if defined(CONFIG_IA64_GENERIC) && defined(CONFIG_CRASH_DUMP) && \
-        defined(CONFIG_PROC_FS)
+#if defined(CONFIG_IA64_GENERIC)
 	/* If we are booting a kdump kernel, the sba_iommu will
 	 * cause devices that were not shutdown properly to MCA
 	 * as soon as they are turned back on.  Our only option for
 	 * a successful kdump kernel boot is to use the swiotlb.
 	 */
-	if (elfcorehdr_addr < ELFCORE_ADDR_MAX) {
+	if (is_kdump_kernel()) {
 		if (swiotlb_late_init_with_default_size(64 * (1<<20)) != 0)
 			panic("Unable to initialize software I/O TLB:"
 				  " Try machvec=dig boot option");