sparc64: Support kmemleak.

Only missing thing was an _sdata marker in vmlinux.lds.S
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

arch/sparc/kernel/vmlinux.lds.S

@@ -52,6 +52,10 @@ SECTIONS
 	_etext = .;
 
 	RO_DATA(PAGE_SIZE)
+
+	/* Start of data section */
+	_sdata = .;
+
 	.data1 : {
 		*(.data1)
 	}

lib/Kconfig.debug

@@ -356,7 +356,7 @@ config SLUB_STATS
 config DEBUG_KMEMLEAK
 	bool "Kernel memory leak detector"
 	depends on DEBUG_KERNEL && EXPERIMENTAL && !MEMORY_HOTPLUG && \
-		(X86 || ARM || PPC || S390 || SUPERH)
+		(X86 || ARM || PPC || S390 || SPARC64 || SUPERH)
 
 	select DEBUG_FS if SYSFS
 	select STACKTRACE if STACKTRACE_SUPPORT