Prev: [PATCH 3/4] netdevice.h net/core/dev.c: Convert netdev_<level> logging macros to functions
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From: Joe Perches on 27 Jun 2010 07:10
Reduces an x86 defconfig text and data ~55k, .6% smaller.

$ size vmlinux*
text data bss dec hex filename
7205273 716016 1366288 9287577 8db799 vmlinux
7258890 719768 1366288 9344946 8e97b2 vmlinux.master

Uses %pV and struct va_format
Format arguments are verified before printk

The dev_info macro is converted to _dev_info because there are
existing uses of variables named dev_info in the kernel tree
like drivers/net/pcmcia/pcnet_cs.c

A dev_info macro is created to call _dev_info

Signed-off-by: Joe Perches <joe(a)perches.com>
---
drivers/base/core.c | 64 +++++++++++++++++++++++++++
include/linux/device.h | 112 ++++++++++++++++++++++++++++++++++++-----------
2 files changed, 150 insertions(+), 26 deletions(-)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 9630fbd..38bbbd0 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -1819,3 +1819,67 @@ void device_shutdown(void)
spin_unlock(&devices_kset->list_lock);
async_synchronize_full();
}
+
+/*
+ * Device logging functions
+ */
+
+#ifdef CONFIG_PRINTK
+
+static int __dev_printk(const char *level, const struct device *dev,
+ struct va_format *vaf)
+{
+ if (!dev)
+ return printk("%s(NULL device *): %pV", level, vaf);
+
+ return printk("%s%s %s: %pV",
+ level, dev_driver_string(dev), dev_name(dev), vaf);
+}
+
+int dev_printk(const char *level, 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(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);
+
+#endif
diff --git a/include/linux/device.h b/include/linux/device.h
index 0713e10..6a8276f 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -638,43 +638,103 @@ extern void sysdev_shutdown(void);

/* debugging and troubleshooting/diagnostic helpers. */
extern const char *dev_driver_string(const struct device *dev);
-#define dev_printk(level, dev, format, arg...) \
- printk(level "%s %s: " format , dev_driver_string(dev) , \
- dev_name(dev) , ## arg)
-
-#define dev_emerg(dev, format, arg...) \
- dev_printk(KERN_EMERG , dev , format , ## arg)
-#define dev_alert(dev, format, arg...) \
- dev_printk(KERN_ALERT , dev , format , ## arg)
-#define dev_crit(dev, format, arg...) \
- dev_printk(KERN_CRIT , dev , format , ## arg)
-#define dev_err(dev, format, arg...) \
- dev_printk(KERN_ERR , dev , format , ## arg)
-#define dev_warn(dev, format, arg...) \
- dev_printk(KERN_WARNING , dev , format , ## arg)
-#define dev_notice(dev, format, arg...) \
- dev_printk(KERN_NOTICE , dev , format , ## arg)
-#define dev_info(dev, format, arg...) \
- dev_printk(KERN_INFO , dev , format , ## arg)
+
+
+#ifdef CONFIG_PRINTK
+
+extern int dev_printk(const char *level, const struct device *dev,
+ const char *fmt, ...)
+ __attribute__ ((format (printf, 3, 4)));
+extern int dev_emerg(const struct device *dev, const char *fmt, ...)
+ __attribute__ ((format (printf, 2, 3)));
+extern int dev_alert(const struct device *dev, const char *fmt, ...)
+ __attribute__ ((format (printf, 2, 3)));
+extern int dev_crit(const struct device *dev, const char *fmt, ...)
+ __attribute__ ((format (printf, 2, 3)));
+extern int dev_err(const struct device *dev, const char *fmt, ...)
+ __attribute__ ((format (printf, 2, 3)));
+extern int dev_warn(const struct device *dev, const char *fmt, ...)
+ __attribute__ ((format (printf, 2, 3)));
+extern int dev_notice(const struct device *dev, const char *fmt, ...)
+ __attribute__ ((format (printf, 2, 3)));
+extern int _dev_info(const struct device *dev, const char *fmt, ...)
+ __attribute__ ((format (printf, 2, 3)));
+
+#else
+
+static inline int dev_printk(const char *level, const struct device *dev,
+ const char *fmt, ...)
+ __attribute__ ((format (printf, 3, 4)));
+static inline int dev_printk(const char *level, const struct device *dev,
+ const char *fmt, ...)
+ { return 0; }
+
+static inline int dev_emerg(const struct device *dev, const char *fmt, ...)
+ __attribute__ ((format (printf, 2, 3)));
+static inline int dev_emerg(const struct device *dev, const char *fmt, ...)
+ { return 0; }
+static inline int dev_crit(const struct device *dev, const char *fmt, ...)
+ __attribute__ ((format (printf, 2, 3)));
+static inline int dev_crit(const struct device *dev, const char *fmt, ...)
+ { return 0; }
+static inline int dev_alert(const struct device *dev, const char *fmt, ...)
+ __attribute__ ((format (printf, 2, 3)));
+static inline int dev_alert(const struct device *dev, const char *fmt, ...)
+ { return 0; }
+static inline int dev_err(const struct device *dev, const char *fmt, ...)
+ __attribute__ ((format (printf, 2, 3)));
+static inline int dev_err(const struct device *dev, const char *fmt, ...)
+ { return 0; }
+static inline int dev_warn(const struct device *dev, const char *fmt, ...)
+ __attribute__ ((format (printf, 2, 3)));
+static inline int dev_warn(const struct device *dev, const char *fmt, ...)
+ { return 0; }
+static inline int dev_notice(const struct device *dev, const char *fmt, ...)
+ __attribute__ ((format (printf, 2, 3)));
+static inline int dev_notice(const struct device *dev, const char *fmt, ...)
+ { return 0; }
+static inline int _dev_info(const struct device *dev, const char *fmt, ...)
+ __attribute__ ((format (printf, 2, 3)));
+static inline int _dev_info(const struct device *dev, const char *fmt, ...)
+ { return 0; }
+
+#endif
+
+/*
+ * Stupid hackaround for existing uses of non-printk uses dev_info
+ *
+ * Note that the definition of dev_info below is actually _dev_info
+ * and a macro is used to avoid redefining dev_info
+ */
+
+#define dev_info(dev, fmt, arg...) _dev_info(dev, fmt, ##arg)

#if defined(DEBUG)
#define dev_dbg(dev, format, arg...) \
- dev_printk(KERN_DEBUG , dev , format , ## arg)
+ dev_printk(KERN_DEBUG, dev, format, ##arg)
#elif defined(CONFIG_DYNAMIC_DEBUG)
-#define dev_dbg(dev, format, ...) do { \
+#define dev_dbg(dev, format, ...) \
+do { \
dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
- } while (0)
+} while (0)
#else
-#define dev_dbg(dev, format, arg...) \
- ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
+#define dev_dbg(dev, format, arg...) \
+({ \
+ if (0) \
+ dev_printk(KERN_DEBUG, dev, format, ##arg); \
+ 0; \
+})
#endif

#ifdef VERBOSE_DEBUG
#define dev_vdbg dev_dbg
#else
-
-#define dev_vdbg(dev, format, arg...) \
- ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
+#define dev_vdbg(dev, format, arg...) \
+({ \
+ if (0) \
+ dev_printk(KERN_DEBUG, dev, format, ##arg); \
+ 0; \
+})
#endif

/*
--
1.7.1.337.g6068.dirty

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Prev: [PATCH 3/4] netdevice.h net/core/dev.c: Convert netdev_<level> logging macros to functions
Next: 2.6.35-rc3 oops trying to suspend.