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Message-ID: <20120907145235.GA18673@redhat.com>
Date: Fri, 7 Sep 2012 10:52:35 -0400
From: Jason Baron <jbaron@...hat.com>
To: Joe Perches <joe@...ches.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, netdev@...r.kernel.org,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"David S. Miller" <davem@...emloft.net>,
Jim Cromie <jim.cromie@...il.com>, Kay Sievers <kay@...y.org>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/5] dev_<level> and dynamic_debug cleanups
On Thu, Sep 06, 2012 at 11:43:46AM -0700, Joe Perches wrote:
> On Thu, 2012-09-06 at 13:51 -0400, Jason Baron wrote:
> > On Sun, Aug 26, 2012 at 04:25:25AM -0700, Joe Perches wrote:
> > > The recent commit to fix dynamic_debug was a bit unclean.
> > > Neaten the style for dynamic_debug.
> > > Reduce the stack use of message logging that uses netdev_printk
> > > Add utility functions dev_printk_emit and dev_vprintk_emit for /dev/kmsg.
> > >
> > > Joe Perches (5):
> > > dev_dbg/dynamic_debug: Update to use printk_emit, optimize stack
> > > netdev_printk/dynamic_netdev_dbg: Directly call printk_emit
> > > netdev_printk/netif_printk: Remove a superfluous logging colon
> > > dev: Add dev_vprintk_emit and dev_printk_emit
> > > device and dynamic_debug: Use dev_vprintk_emit and dev_printk_emit
> > >
> >
> > Looks Good.
> >
> > The one thing that is bothering me though, is that for
> > __dynamic_dev_dbg(), __dynamic_netdev_dbg(), we are copying much of the core
> > logic of __dev_printk(), __netdev_printk(), respectively. I would prefer
> > have this in one place. Can we add a 'prefix' argument to __dev_printk(),
> > and __netdev_printk() that dynamic debug can use, but is simply empty
> > for dev_printk() and netdev_printk().
>
> I don't think that's an improvement actually.
> Why don't you try it.
>
Ok, below is what I was thinking. It winds up being more deletions than
insertions.
Thanks,
-Jason
dynamic debug: remove duplicate __netdev_printk() and __dev_printk() logic
Add an option prefix string argument to __netdev_printk() and __dev_printk().
In this way dynamic debug does not have to contain duplicate logic.
Signed-off-by: Jason Baron <jbaron@...hat.com>
---
drivers/base/core.c | 13 +++++++------
include/linux/device.h | 3 +++
include/linux/netdevice.h | 3 +++
lib/dynamic_debug.c | 32 ++++++++------------------------
net/core/dev.c | 11 ++++++-----
5 files changed, 27 insertions(+), 35 deletions(-)
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 65f82e3..7b4ee6d 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -1937,15 +1937,16 @@ int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...)
}
EXPORT_SYMBOL(dev_printk_emit);
-static int __dev_printk(const char *level, const struct device *dev,
- struct va_format *vaf)
+int __dev_printk(const char *level, const struct device *dev,
+ char *prefix, struct va_format *vaf)
{
if (!dev)
return printk("%s(NULL device *): %pV", level, vaf);
return dev_printk_emit(level[1] - '0', dev,
- "%s %s: %pV",
- dev_driver_string(dev), dev_name(dev), vaf);
+ "%s%s %s: %pV",
+ prefix, dev_driver_string(dev),
+ dev_name(dev), vaf);
}
int dev_printk(const char *level, const struct device *dev,
@@ -1960,7 +1961,7 @@ int dev_printk(const char *level, const struct device *dev,
vaf.fmt = fmt;
vaf.va = &args;
- r = __dev_printk(level, dev, &vaf);
+ r = __dev_printk(level, dev, "", &vaf);
va_end(args);
@@ -1980,7 +1981,7 @@ int func(const struct device *dev, const char *fmt, ...) \
vaf.fmt = fmt; \
vaf.va = &args; \
\
- r = __dev_printk(kern_level, dev, &vaf); \
+ r = __dev_printk(kern_level, dev, "", &vaf); \
\
va_end(args); \
\
diff --git a/include/linux/device.h b/include/linux/device.h
index 2da4589..573b15e 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -891,6 +891,9 @@ extern const char *dev_driver_string(const struct device *dev);
#ifdef CONFIG_PRINTK
+extern int __dev_printk(const char *level, const struct device *dev,
+ char *prefix, struct va_format *vaf);
+
extern int dev_vprintk_emit(int level, const struct device *dev,
const char *fmt, va_list args);
extern __printf(3, 4)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 5f49cc0..63f6165 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2720,6 +2720,9 @@ static inline const char *netdev_name(const struct net_device *dev)
return dev->name;
}
+extern int __netdev_printk(const char *level, const struct net_device *dev,
+ char *prefix, struct va_format *vaf);
+
extern __printf(3, 4)
int netdev_printk(const char *level, const struct net_device *dev,
const char *format, ...);
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index e7f7d99..83bf601 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -578,6 +578,7 @@ int __dynamic_dev_dbg(struct _ddebug *descriptor,
struct va_format vaf;
va_list args;
int res;
+ char buf[PREFIX_SIZE];
BUG_ON(!descriptor);
BUG_ON(!fmt);
@@ -587,16 +588,9 @@ int __dynamic_dev_dbg(struct _ddebug *descriptor,
vaf.fmt = fmt;
vaf.va = &args;
- if (!dev) {
- res = printk(KERN_DEBUG "(NULL device *): %pV", &vaf);
- } else {
- char buf[PREFIX_SIZE];
-
- res = dev_printk_emit(7, dev, "%s%s %s: %pV",
- dynamic_emit_prefix(descriptor, buf),
- dev_driver_string(dev), dev_name(dev),
- &vaf);
- }
+ res = __dev_printk(KERN_DEBUG, dev,
+ dynamic_emit_prefix(descriptor, buf),
+ &vaf);
va_end(args);
@@ -612,6 +606,7 @@ int __dynamic_netdev_dbg(struct _ddebug *descriptor,
struct va_format vaf;
va_list args;
int res;
+ char buf[PREFIX_SIZE];
BUG_ON(!descriptor);
BUG_ON(!fmt);
@@ -621,20 +616,9 @@ int __dynamic_netdev_dbg(struct _ddebug *descriptor,
vaf.fmt = fmt;
vaf.va = &args;
- if (dev && dev->dev.parent) {
- char buf[PREFIX_SIZE];
-
- res = dev_printk_emit(7, dev->dev.parent,
- "%s%s %s %s: %pV",
- dynamic_emit_prefix(descriptor, buf),
- dev_driver_string(dev->dev.parent),
- dev_name(dev->dev.parent),
- netdev_name(dev), &vaf);
- } else if (dev) {
- res = printk(KERN_DEBUG "%s: %pV", netdev_name(dev), &vaf);
- } else {
- res = printk(KERN_DEBUG "(NULL net_device): %pV", &vaf);
- }
+ res = __netdev_printk(KERN_DEBUG, dev,
+ dynamic_emit_prefix(descriptor, buf),
+ &vaf);
va_end(args);
diff --git a/net/core/dev.c b/net/core/dev.c
index 8ad42fd..5fef0f6 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6422,15 +6422,16 @@ const char *netdev_drivername(const struct net_device *dev)
return empty;
}
-static int __netdev_printk(const char *level, const struct net_device *dev,
- struct va_format *vaf)
+int __netdev_printk(const char *level, const struct net_device *dev,
+ char *prefix, struct va_format *vaf)
{
int r;
if (dev && dev->dev.parent) {
r = dev_printk_emit(level[1] - '0',
dev->dev.parent,
- "%s %s %s: %pV",
+ "%s%s %s %s: %pV",
+ prefix,
dev_driver_string(dev->dev.parent),
dev_name(dev->dev.parent),
netdev_name(dev), vaf);
@@ -6455,7 +6456,7 @@ int netdev_printk(const char *level, const struct net_device *dev,
vaf.fmt = format;
vaf.va = &args;
- r = __netdev_printk(level, dev, &vaf);
+ r = __netdev_printk(level, dev, "", &vaf);
va_end(args);
@@ -6475,7 +6476,7 @@ int func(const struct net_device *dev, const char *fmt, ...) \
vaf.fmt = fmt; \
vaf.va = &args; \
\
- r = __netdev_printk(level, dev, &vaf); \
+ r = __netdev_printk(level, dev, "", &vaf); \
\
va_end(args); \
\
--
1.7.7.6
--
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