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Message-ID: <20120821.100204.446226016699627525.hdoyu@nvidia.com>
Date: Tue, 21 Aug 2012 09:02:04 +0200
From: Hiroshi Doyu <hdoyu@...dia.com>
To: "crope@....fi" <crope@....fi>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
"htl10@...rs.sourceforge.net" <htl10@...rs.sourceforge.net>,
"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
"joe@...ches.com" <joe@...ches.com>,
"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH 1/1] driver-core: Shut up dev_dbg_reatelimited() without
DEBUG
Antti Palosaari <crope@....fi> wrote @ Mon, 20 Aug 2012 23:29:34 +0200:
> On 08/20/2012 02:14 PM, Hiroshi Doyu wrote:
> > Hi Antti,
> >
> > Antti Palosaari <crope@....fi> wrote @ Sat, 18 Aug 2012 02:11:56 +0200:
> >
> >> On 08/17/2012 09:04 AM, Hiroshi Doyu wrote:
> >>> dev_dbg_reatelimited() without DEBUG printed "217078 callbacks
> >>> suppressed". This shouldn't print anything without DEBUG.
> >>>
> >>> Signed-off-by: Hiroshi Doyu <hdoyu@...dia.com>
> >>> Reported-by: Antti Palosaari <crope@....fi>
> >>> ---
> >>> include/linux/device.h | 6 +++++-
> >>> 1 files changed, 5 insertions(+), 1 deletions(-)
> >>>
> >>> diff --git a/include/linux/device.h b/include/linux/device.h
> >>> index eb945e1..d4dc26e 100644
> >>> --- a/include/linux/device.h
> >>> +++ b/include/linux/device.h
> >>> @@ -962,9 +962,13 @@ do { \
> >>> dev_level_ratelimited(dev_notice, dev, fmt, ##__VA_ARGS__)
> >>> #define dev_info_ratelimited(dev, fmt, ...) \
> >>> dev_level_ratelimited(dev_info, dev, fmt, ##__VA_ARGS__)
> >>> +#if defined(DEBUG)
> >>> #define dev_dbg_ratelimited(dev, fmt, ...) \
> >>> dev_level_ratelimited(dev_dbg, dev, fmt, ##__VA_ARGS__)
> >>> -
> >>> +#else
> >>> +#define dev_dbg_ratelimited(dev, fmt, ...) \
> >>> + no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
> >>> +#endif
> >>> /*
> >>> * Stupid hackaround for existing uses of non-printk uses dev_info
> >>> *
> >>>
> >>
> >> NACK. I don't think that's correct behavior. After that patch it kills
> >> all output of dev_dbg_ratelimited(). If I use dynamic debugs and order
> >> debugs, I expect to see debugs as earlier.
> >
> > You are right. I attached the update patch, just moving *_ratelimited
> > functions after dev_dbg() definitions.
> >
> > With DEBUG defined/undefined in your "test.ko", it works fine. With
> > CONFIG_DYNAMIC_DEBUG, it works with "+p", but with "-p", still
> > "..callbacks suppressed" is printed.
>
> I am using dynamic debugs and behavior is now just same as it was when
> reported that bug. OK, likely for static debug it is now correct.
The following patch can also refrain "..callbacks suppressed" with
"-p". I think that it's ok for all cases.
>From b4c6aa9160f03b61ed17975c73db36c983a48927 Mon Sep 17 00:00:00 2001
From: Hiroshi Doyu <hdoyu@...dia.com>
Date: Mon, 20 Aug 2012 13:49:19 +0300
Subject: [v3 1/1] driver-core: Shut up dev_dbg_reatelimited() without DEBUG
dev_dbg_reatelimited() without DEBUG printed "217078 callbacks
suppressed". This shouldn't print anything without DEBUG.
With CONFIG_DYNAMIC_DEBUG, the print should be configured as expected.
Signed-off-by: Hiroshi Doyu <hdoyu@...dia.com>
Reported-by: Antti Palosaari <crope@....fi>
---
include/linux/device.h | 62 +++++++++++++++++++++++++++++------------------
1 files changed, 38 insertions(+), 24 deletions(-)
diff --git a/include/linux/device.h b/include/linux/device.h
index 9648331..bb6ffcb 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -932,6 +932,32 @@ int _dev_info(const struct device *dev, const char *fmt, ...)
#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(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...) \
+({ \
+ if (0) \
+ dev_printk(KERN_DEBUG, dev, format, ##arg); \
+ 0; \
+})
+#endif
+
#define dev_level_ratelimited(dev_level, dev, fmt, ...) \
do { \
static DEFINE_RATELIMIT_STATE(_rs, \
@@ -955,33 +981,21 @@ do { \
dev_level_ratelimited(dev_notice, dev, fmt, ##__VA_ARGS__)
#define dev_info_ratelimited(dev, fmt, ...) \
dev_level_ratelimited(dev_info, dev, fmt, ##__VA_ARGS__)
+#if defined(CONFIG_DYNAMIC_DEBUG) || defined(DEBUG)
#define dev_dbg_ratelimited(dev, fmt, ...) \
- dev_level_ratelimited(dev_dbg, dev, fmt, ##__VA_ARGS__)
-
-/*
- * 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(CONFIG_DYNAMIC_DEBUG)
-#define dev_dbg(dev, format, ...) \
-do { \
- dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
+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(&descriptor, pr_fmt(fmt), \
+ ##__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...) \
-({ \
- if (0) \
- dev_printk(KERN_DEBUG, dev, format, ##arg); \
- 0; \
-})
+#define dev_dbg_ratelimited(dev, fmt, ...) \
+ no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
#endif
#ifdef VERBOSE_DEBUG
--
1.7.5.4
--
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