[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/arch/s390/include/asm/setup.h b/arch/s390/include/asm/setup.h
index 2bd9fae..e8bd6ac 100644
--- a/arch/s390/include/asm/setup.h
+++ b/arch/s390/include/asm/setup.h
@@ -43,6 +43,8 @@
extern struct mem_chunk memory_chunk[];
extern unsigned long real_memory_size;
+extern int memory_end_set;
+extern unsigned long memory_end;
void detect_memory_layout(struct mem_chunk chunk[]);
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index d825f49..c5cfb61 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -82,7 +82,9 @@
struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
-static unsigned long __initdata memory_end;
+
+int __initdata memory_end_set;
+unsigned long __initdata memory_end;
/*
* This is set up by the setup-routine at boot-time
@@ -281,6 +283,7 @@
static int __init early_parse_mem(char *p)
{
memory_end = memparse(p, &p);
+ memory_end_set = 1;
return 0;
}
early_param("mem", early_parse_mem);
@@ -508,8 +511,10 @@
int i;
#if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
- if (ipl_info.type == IPL_TYPE_FCP_DUMP)
+ if (ipl_info.type == IPL_TYPE_FCP_DUMP) {
memory_end = ZFCPDUMP_HSA_SIZE;
+ memory_end_set = 1;
+ }
#endif
memory_size = 0;
memory_end &= PAGE_MASK;
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;