[S390] Enable kmemleak on s390.

Also increase the maximum possible kmemleak early log entries since
2000 are not sufficient on s390.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/kernel/vmlinux.lds.S

@@ -51,6 +51,7 @@ SECTIONS
 
 	. = ALIGN(PAGE_SIZE);
 	_eshared = .;		/* End of shareable data */
+	_sdata = .;		/* Start of data section */
 
 	EXCEPTION_TABLE(16) :data
 

lib/Kconfig.debug

@@ -346,8 +346,9 @@ config SLUB_STATS
 
 config DEBUG_KMEMLEAK
 	bool "Kernel memory leak detector"
-	depends on DEBUG_KERNEL && EXPERIMENTAL && (X86 || ARM || PPC) && \
-		!MEMORY_HOTPLUG
+	depends on DEBUG_KERNEL && EXPERIMENTAL && !MEMORY_HOTPLUG && \
+		(X86 || ARM || PPC || S390)
+
 	select DEBUG_FS if SYSFS
 	select STACKTRACE if STACKTRACE_SUPPORT
 	select KALLSYMS
@@ -370,7 +371,7 @@ config DEBUG_KMEMLEAK
 config DEBUG_KMEMLEAK_EARLY_LOG_SIZE
 	int "Maximum kmemleak early log entries"
 	depends on DEBUG_KMEMLEAK
-	range 200 2000
+	range 200 40000
 	default 400
 	help
 	  Kmemleak must track all the memory allocations to avoid