s390/kexec: add __GFP_NORETRY to KEXEC_CONTROL_MEMORY_GFP

Avoid invoking the OOM-killer when allocating the control page. This
is the s390 variant of commit dc5cccac ("kexec: don't invoke
OOM-killer for control page allocation").
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

arch/s390/include/asm/kexec.h

@@ -29,7 +29,7 @@
 #define KEXEC_CONTROL_MEMORY_LIMIT (1UL<<31)
 
 /* Allocate control page with GFP_DMA */
-#define KEXEC_CONTROL_MEMORY_GFP GFP_DMA
+#define KEXEC_CONTROL_MEMORY_GFP (GFP_DMA | __GFP_NORETRY)
 
 /* Maximum address we can use for the crash control pages */
 #define KEXEC_CRASH_CONTROL_MEMORY_LIMIT (-1UL)