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netdev_printk/dynamic_netdev_dbg: Directly call printk_emit 

A lot of stack is used in recursive printks with %pV.

Using multiple levels of %pV (a logging function with %pV
that calls another logging function with %pV) can consume
more stack than necessary.

Avoid excessive stack use by not calling dev_printk from
netdev_printk and dynamic_netdev_dbg.  Duplicate the logic
and form of dev_printk instead.

Make __netdev_printk static.
Remove EXPORT_SYMBOL(__netdev_printk)
Whitespace and brace style neatening.

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: David S. Miller <davem@davemloft.net>
Tested-by: Jim Cromie <jim.cromie@gmail.com>
Acked-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Joe Perches 2012-09-12 20:12:19 -07:00 committed by Greg Kroah-Hartman
parent 798efc60e4
commit b004ff4972
3 changed files with 40 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/linux/netdevice.h
View File

@ -2720,9 +2720,6 @@ 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,
struct va_format *vaf);
extern __printf(3, 4)
int netdev_printk(const char *level, const struct net_device *dev,
const char *format, ...);

26
lib/dynamic_debug.c
View File

@ -611,20 +611,40 @@ EXPORT_SYMBOL(__dynamic_dev_dbg);
#ifdef CONFIG_NET
int __dynamic_netdev_dbg(struct _ddebug *descriptor,
const struct net_device *dev, const char *fmt, ...)
const struct net_device *dev, const char *fmt, ...)
{
struct va_format vaf;
va_list args;
int res;
char buf[PREFIX_SIZE];
BUG_ON(!descriptor);
BUG_ON(!fmt);
va_start(args, fmt);
vaf.fmt = fmt;
vaf.va = &args;
res = __netdev_printk(dynamic_emit_prefix(descriptor, buf), dev, &vaf);
if (dev && dev->dev.parent) {
char buf[PREFIX_SIZE];
char dict[128];
size_t dictlen;
dictlen = create_syslog_header(dev->dev.parent,
dict, sizeof(dict));
res = printk_emit(0, 7, dictlen ? dict : NULL, dictlen,
"%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);
}
va_end(args);
return res;

24
net/core/dev.c
View File

@ -6423,22 +6423,30 @@ const char *netdev_drivername(const struct net_device *dev)
return empty;
}
int __netdev_printk(const char *level, const struct net_device *dev,
static int __netdev_printk(const char *level, const struct net_device *dev,
struct va_format *vaf)
{
int r;
if (dev && dev->dev.parent)
r = dev_printk(level, dev->dev.parent, "%s: %pV",
netdev_name(dev), vaf);
else if (dev)
if (dev && dev->dev.parent) {
char dict[128];
size_t dictlen = create_syslog_header(dev->dev.parent,
dict, sizeof(dict));
r = printk_emit(0, level[1] - '0',
dictlen ? dict : NULL, dictlen,
"%s %s: %s: %pV",
dev_driver_string(dev->dev.parent),
dev_name(dev->dev.parent),
netdev_name(dev), vaf);
} else if (dev) {
r = printk("%s%s: %pV", level, netdev_name(dev), vaf);
else
} else {
r = printk("%s(NULL net_device): %pV", level, vaf);
}
return r;
}
EXPORT_SYMBOL(__netdev_printk);
int netdev_printk(const char *level, const struct net_device *dev,
const char *format, ...)
@ -6453,6 +6461,7 @@ int netdev_printk(const char *level, const struct net_device *dev,
vaf.va = &args;
r = __netdev_printk(level, dev, &vaf);
va_end(args);
return r;
@ -6472,6 +6481,7 @@ int func(const struct net_device *dev, const char *fmt, ...) \
vaf.va = &args; \
\
r = __netdev_printk(level, dev, &vaf); \
\
va_end(args); \
\
return r; \