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Subject[patch 1/4] kmsg: Kernel message catalog macros.
From: Martin Schwidefsky <schwidefsky@de.ibm.com>
From: Michael Holzheu <holzheu@de.ibm.com>

Introduce a new family of printk macros which prefixes each kmsg message
with a component name and allows to tag the message with a 24 bit hash of
the message text. The kmsg component name is defined per source file with
the KMSG_COMPONENT macro.

If the message hash will be printed to the console / syslog at all depends
on CONFIG_MSG_IDS. If it is "n" then a kmsg_xxx call is just another
printk wrapper. These macros are intended to be used uniformly in the
s390 architecture and the s390 device drivers.

Signed-off-by: Michael Holzheu <holzheu@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

arch/s390/Kconfig | 9 ++++++++
include/linux/kmsg.h | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++
kernel/printk.c | 24 ++++++++++++++++++++++
3 files changed, 87 insertions(+)

Index: quilt-2.6/arch/s390/Kconfig
===================================================================
--- quilt-2.6.orig/arch/s390/Kconfig
+++ quilt-2.6/arch/s390/Kconfig
@@ -571,6 +571,15 @@ bool "s390 guest support (EXPERIMENTAL)"
select VIRTIO_CONSOLE
help
Select this option if you want to run the kernel under s390 linux
+
+config KMSG_IDS
+ bool "Kernel message numbers"
+ default y
+ help
+ Select this option if you want to include a message number to the
+ prefix for kernel messages issued by the s390 architecture and
+ driver code. See "Documentation/s390/kmsg.txt" for more details.
+
endmenu

source "net/Kconfig"
Index: quilt-2.6/include/linux/kmsg.h
===================================================================
--- /dev/null
+++ quilt-2.6/include/linux/kmsg.h
@@ -0,0 +1,54 @@
+#ifndef _LINUX_KMSG_H
+#define _LINUX_KMSG_H
+
+int kmsg_printk(char *prefix, char *fmt, ...);
+
+#if defined(__KMSG_CHECKER)
+#define KMSG_ID KMSG_COMPONENT ".%06x"
+#define KMSG_FMT(fmt) _$_(fmt)_$_
+#define kmsg_printk __KMSG_CHECK
+#elif defined(CONFIG_KMSG_IDS)
+#define KMSG_ID KMSG_COMPONENT ".%06x"
+#define KMSG_FMT(fmt) fmt
+#else /* !defined(CONFIG_KMSG_IDS) */
+#define KMSG_ID KMSG_COMPONENT
+#define KMSG_FMT(fmt) fmt
+#define kmsg_printk(prefix, fmt, ...) printk(prefix # fmt, ##__VA_ARGS__)
+#endif
+
+#define kmsg_alert(fmt, ...) \
+ kmsg_printk(KERN_ALERT KMSG_ID ": ", KMSG_FMT(fmt), ##__VA_ARGS__)
+
+#define kmsg_err(fmt, ...) \
+ kmsg_printk(KERN_ERR KMSG_ID ": ", KMSG_FMT(fmt), ##__VA_ARGS__)
+
+#define kmsg_warn(fmt, ...) \
+ kmsg_printk(KERN_WARNING KMSG_ID ": ", KMSG_FMT(fmt), ##__VA_ARGS__)
+
+#define kmsg_info(fmt, ...) \
+ kmsg_printk(KERN_INFO KMSG_ID ": ", KMSG_FMT(fmt), ##__VA_ARGS__)
+
+#define kmsg_notice(fmt, ...) \
+ kmsg_printk(KERN_NOTICE KMSG_ID ": ", KMSG_FMT(fmt), ##__VA_ARGS__)
+
+#define kmsg_dev_alert(dev, fmt, ...) \
+ kmsg_printk(KERN_ALERT KMSG_ID ":%s: ", KMSG_FMT(fmt), \
+ dev_name(dev), ##__VA_ARGS__)
+
+#define kmsg_dev_err(dev, fmt, ...) \
+ kmsg_printk(KERN_ERR KMSG_ID ":%s: ", KMSG_FMT(fmt), \
+ dev_name(dev), ##__VA_ARGS__)
+
+#define kmsg_dev_warn(dev, fmt, ...) \
+ kmsg_printk(KERN_WARNING KMSG_ID ":%s: ", KMSG_FMT(fmt), \
+ dev_name(dev), ##__VA_ARGS__)
+
+#define kmsg_dev_info(dev, fmt, ...) \
+ kmsg_printk(KERN_INFO KMSG_ID ":%s: ", KMSG_FMT(fmt), \
+ dev_name(dev), ##__VA_ARGS__)
+
+#define kmsg_dev_notice(dev, fmt, ...) \
+ kmsg_printk(KERN_NOTICE KMSG_ID ":%s: ", KMSG_FMT(fmt), \
+ dev_name(dev), ##__VA_ARGS__)
+
+#endif /* _LINUX_KMSG_H */
Index: quilt-2.6/kernel/printk.c
===================================================================
--- quilt-2.6.orig/kernel/printk.c
+++ quilt-2.6/kernel/printk.c
@@ -32,6 +32,7 @@
#include <linux/security.h>
#include <linux/bootmem.h>
#include <linux/syscalls.h>
+#include <linux/jhash.h>

#include <asm/uaccess.h>

@@ -1343,3 +1344,26 @@ bool printk_timed_ratelimit(unsigned lon
}
EXPORT_SYMBOL(printk_timed_ratelimit);
#endif
+
+#if defined CONFIG_PRINTK && defined CONFIG_KMSG_IDS
+
+/**
+ * kmsg_printk - print a kernel message with a message id
+ * @fmt: format string
+ * @hfmt: revelant part of the format string included in the hash
+ */
+asmlinkage int kmsg_printk(const char *prefix, const char *fmt, ...)
+{
+ va_list args;
+ int r;
+
+ r = printk(prefix, jhash(fmt, strlen(fmt), 0) & 0xffffff);
+ va_start(args, fmt);
+ r += vprintk(fmt, args);
+ va_end(args);
+
+ return r;
+}
+EXPORT_SYMBOL(kmsg_printk);
+
+#endif
--
blue skies,
Martin.

"Reality continues to ruin my life." - Calvin.



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