From: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Signed-off-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
---
Documentation/s390/kmsg/cpcmd | 18 ++++++++++++++++++
arch/s390/kernel/cpcmd.c | 7 +++++--
2 files changed, 23 insertions(+), 2 deletions(-)
Index: quilt-2.6/arch/s390/kernel/cpcmd.c
===================================================================
--- quilt-2.6.orig/arch/s390/kernel/cpcmd.c
+++ quilt-2.6/arch/s390/kernel/cpcmd.c
@@ -15,9 +15,12 @@
#include <linux/string.h>
#include <asm/ebcdic.h>
#include <asm/cpcmd.h>
+#include <asm/kmsg.h>
#include <asm/system.h>
#include <asm/io.h>
+#define KMSG_COMPONENT "cpcmd"
+
static DEFINE_SPINLOCK(cpcmd_lock);
static char cpcmd_buf[241];
@@ -104,8 +107,8 @@ int cpcmd(const char *cmd, char *respons
(((unsigned long)response + rlen) >> 31)) {
lowbuf = kmalloc(rlen, GFP_KERNEL | GFP_DMA);
if (!lowbuf) {
- printk(KERN_WARNING
- "cpcmd: could not allocate response buffer\n");
+ kmsg_warn(1, "The cpcmd kernel function failed to "
+ "allocate a response buffer\n");
return -ENOMEM;
}
spin_lock_irqsave(&cpcmd_lock, flags);
Index: quilt-2.6/Documentation/s390/kmsg/cpcmd
===================================================================
--- /dev/null
+++ quilt-2.6/Documentation/s390/kmsg/cpcmd
@@ -0,0 +1,18 @@
+/*?
+ * Text: "The cpcmd kernel function failed to allocate a response buffer"
+ * Tag: cpcmd.1
+ * Severity: Warning
+ * Description:
+ * IPL code, console detection, and device drivers like vmcp or vmlogrdr use
+ * the cpcmd kernel function to send commands to the z/VM control program (CP).
+ * If a program that uses the cpcmd function does not allocate a contiguous
+ * response buffer below 2 GB guest real storage, cpcmd creates a bounce buffer
+ * to be used as the response buffer. Because of low memory or memory
+ * fragmentation, cpcmd could not create the bounce buffer.
+ * User action:
+ * Look for related page allocation failure messages and at the stack trace to
+ * find out which program or operation failed. Free some memory and retry the
+ * failed operation. Consider allocating more memory to your z/VM guest virtual
+ * machine.
+ */
+
--
blue skies,
Martin.
"Reality continues to ruin my life." - Calvin.
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