[S390] kdump: Add KEXEC_CRASH_CONTROL_MEMORY_LIMIT

On s390 there is a different KEXEC_CONTROL_MEMORY_LIMIT for the normal and
the kdump kexec case. Therefore this patch introduces a new macro
KEXEC_CRASH_CONTROL_MEMORY_LIMIT. This is set to
KEXEC_CONTROL_MEMORY_LIMIT for all architectures that do not define
KEXEC_CRASH_CONTROL_MEMORY_LIMIT.

Acked-by: Vivek Goyal <vgoyal@redhat.com>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

2 files changed, 5 insertions, 1 deletions

diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index c2478a342cd7..07d9aba75562 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -33,6 +33,10 @@
 #error KEXEC_ARCH not defined
 #endif
 
+#ifndef KEXEC_CRASH_CONTROL_MEMORY_LIMIT
+#define KEXEC_CRASH_CONTROL_MEMORY_LIMIT KEXEC_CONTROL_MEMORY_LIMIT
+#endif
+
 #define KEXEC_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4)
 #define KEXEC_CORE_NOTE_NAME "CORE"
 #define KEXEC_CORE_NOTE_NAME_BYTES ALIGN(sizeof(KEXEC_CORE_NOTE_NAME), 4)
diff --git a/kernel/kexec.c b/kernel/kexec.c
index 296fbc84d659..7204fb982ed5 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -498,7 +498,7 @@ static struct page *kimage_alloc_crash_control_pages(struct kimage *image,
         while (hole_end <= crashk_res.end) {
                 unsigned long i;
 
-                if (hole_end > KEXEC_CONTROL_MEMORY_LIMIT)
+                if (hole_end > KEXEC_CRASH_CONTROL_MEMORY_LIMIT)
                         break;
                 if (hole_end > crashk_res.end)
                         break;