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Subject[PATCH 4.4 02/32] net: Dont forget pr_fmt on net_dbg_ratelimited for CONFIG_DYNAMIC_DEBUG
4.4-stable review patch.  If anyone has any objections, please let me know.


From: "Jason A. Donenfeld" <>

[ Upstream commit daddef76c3deaaa7922f9d7b18edbf0a061215c3 ]

The implementation of net_dbg_ratelimited in the CONFIG_DYNAMIC_DEBUG
case was added with 2c94b5373 ("net: Implement net_dbg_ratelimited() for
CONFIG_DYNAMIC_DEBUG case"). The implementation strategy was to take the
usual definition of the dynamic_pr_debug macro, but alter it by adding a
call to "net_ratelimit()" in the if statement. This is, in fact, the
correct approach.

However, while doing this, the author of the commit forgot to surround
fmt by pr_fmt, resulting in unprefixed log messages appearing in the
console. So, this commit adds back the pr_fmt(fmt) invocation, making
net_dbg_ratelimited properly consistent across DEBUG, no DEBUG, and
DYNAMIC_DEBUG cases, and bringing parity with the behavior of
dynamic_pr_debug as well.

Fixes: 2c94b5373 ("net: Implement net_dbg_ratelimited() for CONFIG_DYNAMIC_DEBUG case")
Signed-off-by: Jason A. Donenfeld <>
Cc: Tim Bingham <>
Signed-off-by: David S. Miller <>
Signed-off-by: Greg Kroah-Hartman <>
include/linux/net.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- a/include/linux/net.h
+++ b/include/linux/net.h
@@ -251,7 +251,8 @@ do { \
if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) && \
net_ratelimit()) \
- __dynamic_pr_debug(&descriptor, fmt, ##__VA_ARGS__); \
+ __dynamic_pr_debug(&descriptor, pr_fmt(fmt), \
+ ##__VA_ARGS__); \
} while (0)
#elif defined(DEBUG)
#define net_dbg_ratelimited(fmt, ...) \

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