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authorHeiko Carstens <heiko.carstens@de.ibm.com>2013-04-30 10:34:04 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2013-05-02 15:50:26 +0200
commitdf1bd59c5cc247d1d02588ff0a4e86a0cc5f9733 (patch)
tree619ab3b2ef639ebbcd102961c8710b852cd9adfc /drivers/s390
parent67b5c3eeb4814bceb9a7e17fecb14ef59d511812 (diff)
s390/mem_detect: limit memory detection loop to "mem=" parameter
The current memory detection loop will detect all present memory of a machine. This is true even if the user specified the "mem=" parameter on the kernel command line. This can be a problem since the memory detection may cause a fully populated host page table for the guest, even for those parts of the memory that the guest will never use afterwards. So fix this and only detect memory up to a user supplied "mem=" limit if specified. Reported-by: Michael Johanssen <johanssn@de.ibm.com> Reviewed-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/char/zcore.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/s390/char/zcore.c b/drivers/s390/char/zcore.c
index d415ba7f26a6..9e5e14686e75 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;