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Date: Wed, 03 Jul 2013 10:46:16 +0900
From: Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
To: linux-kernel@...r.kernel.org
Cc: yrl.pp-manager.tt@...achi.com, akpm@...ux-foundation.org,
gregkh@...uxfoundation.org, kay@...y.org, davem@...emloft.net,
Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Kay Sievers <kay@...y.org>,
"David S. Miller" <davem@...emloft.net>
Subject: [RFC PATCH 5/5] printk: Add msghash support for dev_printk
Add msghash support for dev_printk and its variants (dev_xxx).
Without this patch, no kmsg_meta data are passed to vprintk_emit,
and this means no hash value is output.
To pass the metadata, this patch changes dev_printk and its
variants to macros which construct the metadata in the similar way
of printk. No API of those functions are changed.
Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Kay Sievers <kay@...y.org>
Cc: "David S. Miller" <davem@...emloft.net>
---
drivers/base/core.c | 56 +++++++++------------------------
drivers/usb/storage/debug.c | 2 +
include/linux/device.h | 73 +++++++++++++++++++++++++------------------
lib/dynamic_debug.c | 4 +-
net/core/dev.c | 2 +
5 files changed, 62 insertions(+), 75 deletions(-)
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 558017d..4b12e8a1 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -1951,8 +1951,8 @@ create_syslog_header(const struct device *dev, char *hdr, size_t hdrlen)
}
EXPORT_SYMBOL(create_syslog_header);
-int dev_vprintk_emit(int level, const struct device *dev,
- const char *fmt, va_list args)
+int dev_vprintk_emit(struct kmsg_meta *meta, int level,
+ const struct device *dev, const char *fmt, va_list args)
{
char hdr[128];
size_t hdrlen;
@@ -1960,18 +1960,19 @@ int dev_vprintk_emit(int level, const struct device *dev,
hdrlen = create_syslog_header(dev, hdr, sizeof(hdr));
return vprintk_emit(0, level, hdrlen ? hdr : NULL, hdrlen,
- fmt, args, NULL);
+ fmt, args, meta);
}
EXPORT_SYMBOL(dev_vprintk_emit);
-int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...)
+int dev_printk_emit(struct kmsg_meta *meta, int level,
+ const struct device *dev, const char *fmt, ...)
{
va_list args;
int r;
va_start(args, fmt);
- r = dev_vprintk_emit(level, dev, fmt, args);
+ r = dev_vprintk_emit(meta, level, dev, fmt, args);
va_end(args);
@@ -1979,19 +1980,20 @@ int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...)
}
EXPORT_SYMBOL(dev_printk_emit);
-static int __dev_printk(const char *level, const struct device *dev,
- struct va_format *vaf)
+static int __dev_printk(struct kmsg_meta *meta, const char *level,
+ const struct device *dev, struct va_format *vaf)
{
if (!dev)
- return printk("%s(NULL device *): %pV", level, vaf);
+ return __printk(meta, "%s(NULL device *): %pV", level, vaf);
- return dev_printk_emit(level[1] - '0', dev,
+ return dev_printk_emit(meta, level[1] - '0', dev,
"%s %s: %pV",
dev_driver_string(dev), dev_name(dev), vaf);
}
-int dev_printk(const char *level, const struct device *dev,
- const char *fmt, ...)
+__printf(4, 5)
+int _dev_printk(struct kmsg_meta *meta, const char *level,
+ const struct device *dev, const char *fmt, ...)
{
struct va_format vaf;
va_list args;
@@ -2002,40 +2004,12 @@ int dev_printk(const char *level, const struct device *dev,
vaf.fmt = fmt;
vaf.va = &args;
- r = __dev_printk(level, dev, &vaf);
+ r = __dev_printk(meta, level, dev, &vaf);
va_end(args);
return r;
}
-EXPORT_SYMBOL(dev_printk);
-
-#define define_dev_printk_level(func, kern_level) \
-int func(const struct device *dev, const char *fmt, ...) \
-{ \
- struct va_format vaf; \
- va_list args; \
- int r; \
- \
- va_start(args, fmt); \
- \
- vaf.fmt = fmt; \
- vaf.va = &args; \
- \
- r = __dev_printk(kern_level, dev, &vaf); \
- \
- va_end(args); \
- \
- return r; \
-} \
-EXPORT_SYMBOL(func);
-
-define_dev_printk_level(dev_emerg, KERN_EMERG);
-define_dev_printk_level(dev_alert, KERN_ALERT);
-define_dev_printk_level(dev_crit, KERN_CRIT);
-define_dev_printk_level(dev_err, KERN_ERR);
-define_dev_printk_level(dev_warn, KERN_WARNING);
-define_dev_printk_level(dev_notice, KERN_NOTICE);
-define_dev_printk_level(_dev_info, KERN_INFO);
+EXPORT_SYMBOL(_dev_printk);
#endif
diff --git a/drivers/usb/storage/debug.c b/drivers/usb/storage/debug.c
index e08f647..22e1115 100644
--- a/drivers/usb/storage/debug.c
+++ b/drivers/usb/storage/debug.c
@@ -186,7 +186,7 @@ int usb_stor_dbg(const struct us_data *us, const char *fmt, ...)
va_start(args, fmt);
- r = dev_vprintk_emit(7, &us->pusb_dev->dev, fmt, args);
+ r = dev_vprintk_emit(NULL, 7, &us->pusb_dev->dev, fmt, args);
va_end(args);
diff --git a/include/linux/device.h b/include/linux/device.h
index c0a1261..89bcce8 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -938,42 +938,55 @@ extern const char *dev_driver_string(const struct device *dev);
#ifdef CONFIG_PRINTK
-extern __printf(3, 0)
-int dev_vprintk_emit(int level, const struct device *dev,
- const char *fmt, va_list args);
-extern __printf(3, 4)
-int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...);
-
-extern __printf(3, 4)
-int dev_printk(const char *level, const struct device *dev,
- const char *fmt, ...);
-extern __printf(2, 3)
-int dev_emerg(const struct device *dev, const char *fmt, ...);
-extern __printf(2, 3)
-int dev_alert(const struct device *dev, const char *fmt, ...);
-extern __printf(2, 3)
-int dev_crit(const struct device *dev, const char *fmt, ...);
-extern __printf(2, 3)
-int dev_err(const struct device *dev, const char *fmt, ...);
-extern __printf(2, 3)
-int dev_warn(const struct device *dev, const char *fmt, ...);
-extern __printf(2, 3)
-int dev_notice(const struct device *dev, const char *fmt, ...);
-extern __printf(2, 3)
-int _dev_info(const struct device *dev, const char *fmt, ...);
+extern __printf(4, 0)
+int dev_vprintk_emit(struct kmsg_meta *meta, int level,
+ const struct device *dev, const char *fmt, va_list args);
+extern __printf(4, 5)
+int dev_printk_emit(struct kmsg_meta *meta, int level,
+ const struct device *dev, const char *fmt, ...);
+
+extern __printf(4, 5)
+int _dev_printk(struct kmsg_meta *_meta, const char *level,
+ const struct device *dev, const char *fmt, ...);
+
+#ifdef CONFIG_KMSG_HASH
+#define dev_printk(level, dev, fmt, args...) \
+({ \
+ DEFINE_KMSG_METADATA(_meta, (fmt)); \
+ _dev_printk(&_meta, (level), (dev), (fmt), ##args); \
+})
+#else
+#define dev_printk(level, dev, fmt, args...) \
+ _dev_printk(NULL, (level), (dev), (fmt), ##args)
+#endif
+#define dev_emerg(dev, fmt, args...) \
+ dev_printk(KERN_EMERG, (dev), (fmt), ##args)
+#define dev_alert(dev, fmt, args...) \
+ dev_printk(KERN_ALERT, (dev), (fmt), ##args)
+#define dev_crit(dev, fmt, args...) \
+ dev_printk(KERN_CRIT, (dev), (fmt), ##args)
+#define dev_err(dev, fmt, args...) \
+ dev_printk(KERN_ERR, (dev), (fmt), ##args)
+#define dev_warn(dev, fmt, args...) \
+ dev_printk(KERN_WARNING, (dev), (fmt), ##args)
+#define dev_notice(dev, fmt, args...) \
+ dev_printk(KERN_NOTICE, (dev), (fmt), ##args)
+#define _dev_info(dev, fmt, args...) \
+ dev_printk(KERN_INFO, (dev), (fmt), ##args)
#else
-static inline __printf(3, 0)
-int dev_vprintk_emit(int level, const struct device *dev,
- const char *fmt, va_list args)
+static inline __printf(4, 0)
+int dev_vprintk_emit(struct kmsg_meta *meta, int level,
+ const struct device *dev, const char *fmt, va_list args)
{ return 0; }
-static inline __printf(3, 4)
-int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...)
+static inline __printf(4, 5)
+int dev_printk_emit(struct kmsg_meta *meta, int level,
+ const struct device *dev, const char *fmt, ...)
{ return 0; }
-static inline int __dev_printk(const char *level, const struct device *dev,
- struct va_format *vaf)
+static inline int __dev_printk(struct kmsg_meta *meta, const char *level,
+ const struct device *dev, struct va_format *vaf)
{ return 0; }
static inline __printf(3, 4)
int dev_printk(const char *level, const struct device *dev,
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 99fec3a..46283dd 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -578,7 +578,7 @@ int __dynamic_dev_dbg(struct _ddebug *descriptor,
} else {
char buf[PREFIX_SIZE];
- res = dev_printk_emit(7, dev, "%s%s %s: %pV",
+ res = dev_printk_emit(NULL, 7, dev, "%s%s %s: %pV",
dynamic_emit_prefix(descriptor, buf),
dev_driver_string(dev), dev_name(dev),
&vaf);
@@ -610,7 +610,7 @@ int __dynamic_netdev_dbg(struct _ddebug *descriptor,
if (dev && dev->dev.parent) {
char buf[PREFIX_SIZE];
- res = dev_printk_emit(7, dev->dev.parent,
+ res = dev_printk_emit(NULL, 7, dev->dev.parent,
"%s%s %s %s: %pV",
dynamic_emit_prefix(descriptor, buf),
dev_driver_string(dev->dev.parent),
diff --git a/net/core/dev.c b/net/core/dev.c
index faebb39..2a16898 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6111,7 +6111,7 @@ static int __netdev_printk(const char *level, const struct net_device *dev,
int r;
if (dev && dev->dev.parent) {
- r = dev_printk_emit(level[1] - '0',
+ r = dev_printk_emit(NULL, level[1] - '0',
dev->dev.parent,
"%s %s %s: %pV",
dev_driver_string(dev->dev.parent),
--
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