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netdev_printk/dynamic_netdev_dbg: Directly call printk_emit

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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
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26
lib/dynamic_debug.c
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@ -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;