[S390] fix "mem=" handling in case of standby memory
Standby memory detected with the sclp interface gets always registered
with add_memory calls without considering the limitationt that the
"mem=" kernel paramater implies.
So fix this and only register standby memory that is below the specified
limit.
This fixes zfcpdump since it uses "mem=32M". In case there is appr.
2GB standby memory present all of usable memory would be used for the
struct pages needed for standby memory.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/char/sclp_cmd.c b/drivers/s390/char/sclp_cmd.c
index 5063904..77ab6e3 100644
--- a/drivers/s390/char/sclp_cmd.c
+++ b/drivers/s390/char/sclp_cmd.c
@@ -19,6 +19,7 @@
#include <linux/memory.h>
#include <asm/chpid.h>
#include <asm/sclp.h>
+#include <asm/setup.h>
#include "sclp.h"
@@ -474,6 +475,10 @@
goto skip_add;
if (start + size > VMEM_MAX_PHYS)
size = VMEM_MAX_PHYS - start;
+ if (memory_end_set && (start >= memory_end))
+ goto skip_add;
+ if (memory_end_set && (start + size > memory_end))
+ size = memory_end - start;
add_memory(0, start, size);
skip_add:
first_rn = rn;