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authorMichael Holzheu <holzheu@linux.vnet.ibm.com>2013-03-08 09:29:34 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2013-03-11 09:59:06 +0100
commit52319b457cd78aa891f5947cf2237dd5f6a4c52d (patch)
tree3f173a837cf0734389905d8ce6722c3b94330801
parentaaaf9cf71c43f42285f2b1a5b54c9306f3cc3150 (diff)
downloadlwn-52319b457cd78aa891f5947cf2237dd5f6a4c52d.tar.gz
lwn-52319b457cd78aa891f5947cf2237dd5f6a4c52d.zip
s390/kdump: Do not add standby memory for kdump
Standby memory that is located outside [0,OLDMEM_SIZE] is currently used by the s390 memory detection. This leads to additional memory consumption due to allocation of page structures. To fix this, we now do not add standby memory if the kernel is started in kdump mode. Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
-rw-r--r--drivers/s390/char/sclp_cmd.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/s390/char/sclp_cmd.c b/drivers/s390/char/sclp_cmd.c
index 30a2255389e5..cd798386b622 100644
--- a/drivers/s390/char/sclp_cmd.c
+++ b/drivers/s390/char/sclp_cmd.c
@@ -627,6 +627,8 @@ static int __init sclp_detect_standby_memory(void)
struct read_storage_sccb *sccb;
int i, id, assigned, rc;
+ if (OLDMEM_BASE) /* No standby memory in kdump mode */
+ return 0;
if (!early_read_info_sccb_valid)
return 0;
if ((sclp_facilities & 0xe00000000000ULL) != 0xe00000000000ULL)