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-rw-r--r--arch/s390/include/asm/setup.h2
-rw-r--r--arch/s390/kernel/crash_dump.c2
-rw-r--r--arch/s390/kernel/early.c1
-rw-r--r--arch/s390/kernel/setup.c2
-rw-r--r--arch/s390/mm/mem_detect.c23
-rw-r--r--drivers/s390/char/zcore.c4
6 files changed, 25 insertions, 9 deletions
diff --git a/arch/s390/include/asm/setup.h b/arch/s390/include/asm/setup.h
index 270fcd0fbf1..2765e40d873 100644
--- a/arch/s390/include/asm/setup.h
+++ b/arch/s390/include/asm/setup.h
@@ -46,7 +46,7 @@ extern struct mem_chunk memory_chunk[];
extern int memory_end_set;
extern unsigned long memory_end;
-void detect_memory_layout(struct mem_chunk chunk[]);
+void detect_memory_layout(struct mem_chunk chunk[], unsigned long maxsize);
void create_mem_hole(struct mem_chunk memory_chunk[], unsigned long addr,
unsigned long size, int type);
diff --git a/arch/s390/kernel/crash_dump.c b/arch/s390/kernel/crash_dump.c
index fb8d8781a01..30b7f63aa4e 100644
--- a/arch/s390/kernel/crash_dump.c
+++ b/arch/s390/kernel/crash_dump.c
@@ -88,7 +88,7 @@ static struct mem_chunk *get_memory_layout(void)
struct mem_chunk *chunk_array;
chunk_array = kzalloc_panic(MEMORY_CHUNKS * sizeof(struct mem_chunk));
- detect_memory_layout(chunk_array);
+ detect_memory_layout(chunk_array, 0);
create_mem_hole(chunk_array, OLDMEM_BASE, OLDMEM_SIZE, CHUNK_CRASHK);
return chunk_array;
}
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index bda011e2f8a..dc8770d7173 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -482,7 +482,6 @@ void __init startup_init(void)
detect_machine_facilities();
setup_topology();
sclp_facilities_detect();
- detect_memory_layout(memory_chunk);
#ifdef CONFIG_DYNAMIC_FTRACE
S390_lowcore.ftrace_func = (unsigned long)ftrace_caller;
#endif
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 555f1895972..cdd9ec0a6fc 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -1066,7 +1066,7 @@ void __init setup_arch(char **cmdline_p)
memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
parse_early_param();
-
+ detect_memory_layout(memory_chunk, memory_end);
os_info_init();
setup_ipl();
reserve_oldmem();
diff --git a/arch/s390/mm/mem_detect.c b/arch/s390/mm/mem_detect.c
index 854c08448de..ec00576bf8d 100644
--- a/arch/s390/mm/mem_detect.c
+++ b/arch/s390/mm/mem_detect.c
@@ -12,7 +12,7 @@
#define ADDR2G (1ULL << 31)
-static void find_memory_chunks(struct mem_chunk chunk[])
+static void find_memory_chunks(struct mem_chunk chunk[], unsigned long maxsize)
{
unsigned long long memsize, rnmax, rzm;
unsigned long addr = 0, size;
@@ -27,6 +27,8 @@ static void find_memory_chunks(struct mem_chunk chunk[])
rzm = min(ADDR2G, rzm);
memsize = memsize ? min(ADDR2G, memsize) : ADDR2G;
}
+ if (maxsize)
+ memsize = memsize ? min((unsigned long)memsize, maxsize) : maxsize;
do {
size = 0;
type = tprot(addr);
@@ -36,6 +38,8 @@ static void find_memory_chunks(struct mem_chunk chunk[])
break;
} while (type == tprot(addr + size));
if (type == CHUNK_READ_WRITE || type == CHUNK_READ_ONLY) {
+ if (memsize && (addr + size > memsize))
+ size = memsize - addr;
chunk[i].addr = addr;
chunk[i].size = size;
chunk[i].type = type;
@@ -45,7 +49,20 @@ static void find_memory_chunks(struct mem_chunk chunk[])
} while (addr < memsize && i < MEMORY_CHUNKS);
}
-void detect_memory_layout(struct mem_chunk chunk[])
+/**
+ * detect_memory_layout - fill mem_chunk array with memory layout data
+ * @chunk: mem_chunk array to be filled
+ * @maxsize: maximum address where memory detection should stop
+ *
+ * Fills the passed in memory chunk array with the memory layout of the
+ * machine. The array must have a size of at least MEMORY_CHUNKS and will
+ * be fully initialized afterwards.
+ * If the maxsize paramater has a value > 0 memory detection will stop at
+ * that address. It is guaranteed that all chunks have an ending address
+ * that is smaller than maxsize.
+ * If maxsize is 0 all memory will be detected.
+ */
+void detect_memory_layout(struct mem_chunk chunk[], unsigned long maxsize)
{
unsigned long flags, flags_dat, cr0;
@@ -69,7 +86,7 @@ void detect_memory_layout(struct mem_chunk chunk[])
}
__ctl_store(cr0, 0, 0);
__ctl_clear_bit(0, 28);
- find_memory_chunks(chunk);
+ find_memory_chunks(chunk, maxsize);
__ctl_load(cr0, 0, 0);
out:
__arch_local_irq_ssm(flags_dat);
diff --git a/drivers/s390/char/zcore.c b/drivers/s390/char/zcore.c
index d415ba7f26a..9e5e14686e7 100644
--- a/drivers/s390/char/zcore.c
+++ b/drivers/s390/char/zcore.c
@@ -426,7 +426,7 @@ static int zcore_memmap_open(struct inode *inode, struct file *filp)
GFP_KERNEL);
if (!chunk_array)
return -ENOMEM;
- detect_memory_layout(chunk_array);
+ detect_memory_layout(chunk_array, 0);
buf = kzalloc(MEMORY_CHUNKS * CHUNK_INFO_SIZE, GFP_KERNEL);
if (!buf) {
kfree(chunk_array);
@@ -610,7 +610,7 @@ static int __init get_mem_info(unsigned long *mem, unsigned long *end)
GFP_KERNEL);
if (!chunk_array)
return -ENOMEM;
- detect_memory_layout(chunk_array);
+ detect_memory_layout(chunk_array, 0);
for (i = 0; i < MEMORY_CHUNKS; i++) {
if (chunk_array[i].size == 0)
break;