pr_debug_ratelimited should be coded similar to dev_dbg_ratelimited
to reduce the "callbacks suppressed" messages.
Signed-off-by: Joe Perches <j...@perches.com>
---
On Sat, 2013-10-26 at 18:37 +0100, Greg Kroah-Hartman wrote:
> On Sat, Oct 26, 2013 at 03:29:56PM +0200, Krzysztof Mazur wrote:
> > Hi,
> >
> > commit 2d6401cf4ca3861692a4779745e0049cac769d10
> > ("USB: usbatm: move the atm_dbg() call to use dynamic debug")
> > changed the atm_rldbg() to:
> >
> > #define atm_rldbg(instance, format, arg...) \
> > if (printk_ratelimit()) \
> > atm_dbg(instance , format , ## arg)
> >
> > and now printk_ratelimit() is always called even when debugging is
> > disabled and a lot of "callbacks suppressed" messages are printed
> > by the printk_ratelimit():
> >
> > [...]
> > usbatm_rx_process: 4977 callbacks suppressed
> > usbatm_extract_one_cell: 2920 callbacks suppressed
> > [...]
> >
> >
> > I'm not sure how to fix that, maybe we need dynamic_pr_debug_ratelimit()?
>
> How about just deleting the use of that macro entirely? Odds are it's
> not really needed anymore, right?
include/linux/printk.h | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/include/linux/printk.h b/include/linux/printk.h
index e6131a78..449d924 100644
--- a/include/linux/printk.h
+++ b/include/linux/printk.h
@@ -343,7 +343,19 @@ extern asmlinkage void dump_stack(void) __cold;
#endif
/* If you are writing a driver, please use dev_dbg instead */
-#if defined(DEBUG)
+#if defined(CONFIG_DYNAMIC_DEBUG)
+/* descriptor check is first to prevent flooding with "callbacks suppressed" */
+#define pr_debug_ratelimited(dev, fmt, ...) \
+do { \
+ static DEFINE_RATELIMIT_STATE(_rs, \
+ DEFAULT_RATELIMIT_INTERVAL, \
+ DEFAULT_RATELIMIT_BURST); \
+ DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \
+ if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) && \
+ __ratelimit(&_rs)) \
+ __dynamic_pr_debug(fmt, ##__VA_ARGS__); \
+} while (0)
+#elif defined(DEBUG)
#define pr_debug_ratelimited(fmt, ...) \
printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
#else
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