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Subject[PATCH] kernel.h: Add a never optimized away pr_dbg for printk(KERN_DEBUG pr_fmt(fmt)...)
Many developers use a logging message that
is printed at KERN_DEBUG level that is always
printed regardless of #define DEBUG levels.

pr_debug can be optimized away to a null statement.

Add a pr_dbg message that prints at KERN_DEBUG
level that uses pr_fmt() that can not be optimized
to nothing.

Signed-off-by: Joe Perches <>

include/linux/kernel.h | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index f4e3184..2ad0396 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -380,6 +380,8 @@ static inline char *pack_hex_byte(char *buf, u8
printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
#define pr_info(fmt, ...) \
printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
+#define pr_dbg(fmt, ...) \
+ printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
#define pr_cont(fmt, ...) \
printk(KERN_CONT fmt, ##__VA_ARGS__)

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