dynamic_debug: make dynamic-debug supersede DEBUG ccflag

If CONFIG_DYNAMIC_DEBUG is defined, honor it over DEBUG, so that
pr_debug()s are controllable, instead of always-on.  When DEBUG is
also defined, change _DPRINTK_FLAGS_DEFAULT to enable printing by
default.

Also adding _DPRINTK_FLAGS_INCL_MODNAME would be nice, but there are
numerous cases of pr_debug(NAME ": ...), which would result in double
printing of module-name.  So defer this until things settle.

Cc: David Miller <davem@davemloft.net>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Signed-off-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

4 files changed, 16 insertions, 12 deletions

diff --git a/include/linux/device.h b/include/linux/device.h
index 5b3adb8f9588..a782d7ff9e8b 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -945,14 +945,14 @@ int _dev_info(const struct device *dev, const char *fmt, ...)
 
 #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)
-#elif defined(CONFIG_DYNAMIC_DEBUG)
+#if defined(CONFIG_DYNAMIC_DEBUG)
 #define dev_dbg(dev, format, ...)                    \
 do {                                                 \
         dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
 } while (0)
+#elif defined(DEBUG)
+#define dev_dbg(dev, format, arg...)            \
+        dev_printk(KERN_DEBUG, dev, format, ##arg)
 #else
 #define dev_dbg(dev, format, arg...)                            \
 ({                                                              \
diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h
index f71a6b046245..29ea09ae30cf 100644
--- a/include/linux/dynamic_debug.h
+++ b/include/linux/dynamic_debug.h
@@ -26,7 +26,11 @@ struct _ddebug {
 #define _DPRINTK_FLAGS_INCL_FUNCNAME    (1<<2)
 #define _DPRINTK_FLAGS_INCL_LINENO      (1<<3)
 #define _DPRINTK_FLAGS_INCL_TID         (1<<4)
+#if defined DEBUG
+#define _DPRINTK_FLAGS_DEFAULT _DPRINTK_FLAGS_PRINT
+#else
 #define _DPRINTK_FLAGS_DEFAULT 0
+#endif
         unsigned int flags:8;
 } __attribute__((aligned(8)));
 
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 0eac07c95255..f486f635e7b5 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2687,14 +2687,14 @@ int netdev_info(const struct net_device *dev, const char *format, ...);
 #define MODULE_ALIAS_NETDEV(device) \
         MODULE_ALIAS("netdev-" device)
 
-#if defined(DEBUG)
-#define netdev_dbg(__dev, format, args...)                      \
-        netdev_printk(KERN_DEBUG, __dev, format, ##args)
-#elif defined(CONFIG_DYNAMIC_DEBUG)
+#if defined(CONFIG_DYNAMIC_DEBUG)
 #define netdev_dbg(__dev, format, args...)                      \
 do {                                                            \
         dynamic_netdev_dbg(__dev, format, ##args);              \
 } while (0)
+#elif defined(DEBUG)
+#define netdev_dbg(__dev, format, args...)                      \
+        netdev_printk(KERN_DEBUG, __dev, format, ##args)
 #else
 #define netdev_dbg(__dev, format, args...)                      \
 ({                                                              \
diff --git a/include/linux/printk.h b/include/linux/printk.h
index f0e22f75143f..f9abd9357a0c 100644
--- a/include/linux/printk.h
+++ b/include/linux/printk.h
@@ -180,13 +180,13 @@ extern void dump_stack(void) __cold;
 #endif
 
 /* If you are writing a driver, please use dev_dbg instead */
-#if defined(DEBUG)
-#define pr_debug(fmt, ...) \
-        printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
-#elif defined(CONFIG_DYNAMIC_DEBUG)
+#if defined(CONFIG_DYNAMIC_DEBUG)
 /* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */
 #define pr_debug(fmt, ...) \
         dynamic_pr_debug(fmt, ##__VA_ARGS__)
+#elif defined(DEBUG)
+#define pr_debug(fmt, ...) \
+        printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 #else
 #define pr_debug(fmt, ...) \
         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)