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Message-ID: <1309297068.29598.26.camel@Joe-Laptop>
Date: Tue, 28 Jun 2011 14:37:48 -0700
From: Joe Perches <joe@...ches.com>
To: Ben Hutchings <bhutchings@...arflare.com>
Cc: netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
Neil Horman <nhorman@...driver.com>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net/core: Convert to current logging forms
On Tue, 2011-06-28 at 21:36 +0100, Ben Hutchings wrote:
> On Tue, 2011-06-28 at 13:31 -0700, Joe Perches wrote:
> > On Tue, 2011-06-28 at 21:21 +0100, Ben Hutchings wrote:
> > > On Tue, 2011-06-28 at 12:40 -0700, Joe Perches wrote:
> > > > Use pr_fmt, pr_<level>, and netdev_<level> as appropriate.
> > > > Coalesce long formats.
> > > [...]
> > > > --- a/net/core/dev.c
> > > > +++ b/net/core/dev.c
> > > > @@ -72,6 +72,8 @@
> > > > +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> > > [...]
> > > KBUILD_MODNAME is presumably going to be "dev".
> > 'tis.
> > > That's not very meaningful.
> > I think it's not useless though.
> > Anything else you think it should be?
> > Maybe "net_core_device:" or some such like that?
> "netdev"
> > Here are the format strings now prefaced by "dev:"
> > $ strings net/core/built-in.o |grep "^<.>dev:"
> > <6>dev: netif_stop_queue() cannot be called before register_netdev()
> > <4>dev: dev_remove_pack: %p not found
> > <3>dev: Loading kernel module for a network device with CAP_SYS_MODULE (deprecated)
> > <0>dev: %s: failed to move %s to init_net: %d
> > <3>dev: alloc_netdev: Unable to allocate device with zero queues
> > <3>dev: alloc_netdev: Unable to allocate device with zero RX queues
> > <3>dev: alloc_netdev: Unable to allocate device
> Many of these refer to a specific device and should be formatted with
> one of the netdev_* logging functions.
Perhaps another way to do this is like this:
As soon as alloc_netdev is called, netdev_<level> can
be used, but the netdev_name() function can contain
printf formatting control codes like %d.
Use pr_fmt(fmt) "netdev: " fmt in net/core/dev.c
Add netdev_is_registered() to netdevice.h
Extend uses of netdev_name() with netdev_is_registered()
to show "(unregistered)" as may be necessary.
Move setting of dev->name in alloc_netdev_mqs to just
after allocation instead of at end of function.
(on top of the original patch, will respin if wanted)
Thoughts?
---
include/linux/netdevice.h | 29 ++++++++++++++++++++++-------
net/core/dev.c | 18 ++++++++++--------
2 files changed, 32 insertions(+), 15 deletions(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 011eb89..4b6c4e2 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2625,11 +2625,16 @@ static inline u32 dev_ethtool_get_flags(struct net_device *dev)
static inline const char *netdev_name(const struct net_device *dev)
{
- if (dev->reg_state != NETREG_REGISTERED)
- return "(unregistered net_device)";
+ if (!dev)
+ return "NULL net_device";
return dev->name;
}
+static inline bool netdev_is_registered(const struct net_device *dev)
+{
+ return dev && dev->reg_state == NETREG_REGISTERED;
+}
+
extern int netdev_printk(const char *level, const struct net_device *dev,
const char *format, ...)
__attribute__ ((format (printf, 3, 4)));
@@ -2657,8 +2662,11 @@ extern int netdev_info(const struct net_device *dev, const char *format, ...)
#elif defined(CONFIG_DYNAMIC_DEBUG)
#define netdev_dbg(__dev, format, args...) \
do { \
- dynamic_dev_dbg((__dev)->dev.parent, "%s: " format, \
- netdev_name(__dev), ##args); \
+ dynamic_dev_dbg((__dev)->dev.parent, "%s%s: " format, \
+ netdev_name(__dev), \
+ netdev_is_registered(__dev) \
+ ? "" : " (unregistered)", \
+ ##args); \
} while (0)
#else
#define netdev_dbg(__dev, format, args...) \
@@ -2687,7 +2695,11 @@ do { \
* file/line information and a backtrace.
*/
#define netdev_WARN(dev, format, args...) \
- WARN(1, "netdevice: %s\n" format, netdev_name(dev), ##args);
+ WARN(1, "netdevice: %s%s\n" format, \
+ netdev_name(dev), \
+ netdev_is_registered(dev) \
+ ? "" : " (unregistered)", \
+ ##args);
/* netif printk helpers, similar to netdev_printk */
@@ -2726,8 +2738,11 @@ do { \
do { \
if (netif_msg_##type(priv)) \
dynamic_dev_dbg((netdev)->dev.parent, \
- "%s: " format, \
- netdev_name(netdev), ##args); \
+ "%s%s: " format, \
+ netdev_name(netdev), \
+ netdev_is_registered(netdev) \
+ ? "" : " (unregistered)", \
+ ##args); \
} while (0)
#else
#define netif_dbg(priv, type, dev, format, args...) \
diff --git a/net/core/dev.c b/net/core/dev.c
index 3401227..44e2646 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -72,7 +72,7 @@
* - netif_rx() feedback
*/
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#define pr_fmt(fmt) "netdev: " fmt
#include <asm/uaccess.h>
#include <asm/system.h>
@@ -5803,13 +5803,13 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
BUG_ON(strlen(name) >= sizeof(dev->name));
if (txqs < 1) {
- pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
+ pr_err("Unable to allocate device with zero queues\n");
return NULL;
}
#ifdef CONFIG_RPS
if (rxqs < 1) {
- pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
+ pr_err("Unable to allocate device with zero RX queues\n");
return NULL;
}
#endif
@@ -5825,13 +5825,15 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
p = kzalloc(alloc_size, GFP_KERNEL);
if (!p) {
- pr_err("alloc_netdev: Unable to allocate device\n");
+ pr_err("Unable to allocate device\n");
return NULL;
}
dev = PTR_ALIGN(p, NETDEV_ALIGN);
dev->padded = (char *)dev - (char *)p;
+ strcpy(dev->name, name);
+
dev->pcpu_refcnt = alloc_percpu(int);
if (!dev->pcpu_refcnt)
goto free_p;
@@ -5864,7 +5866,6 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
goto free_all;
#endif
- strcpy(dev->name, name);
dev->group = INIT_NETDEV_GROUP;
return dev;
@@ -6270,10 +6271,11 @@ static int __netdev_printk(const char *level, const struct net_device *dev,
if (dev && dev->dev.parent)
r = dev_printk(level, dev->dev.parent, "%s: %pV",
netdev_name(dev), vaf);
- else if (dev)
- r = printk("%s%s: %pV", level, netdev_name(dev), vaf);
else
- r = printk("%s(NULL net_device): %pV", level, vaf);
+ r = printk("%s%s%s: %pV",
+ level, netdev_name(dev),
+ netdev_is_registered(dev) ? "" : " (unregistered)",
+ vaf);
return r;
}
--
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