From b004ff4972e2a42aa4512c90cc6a9e4dc1bb36b6 Mon Sep 17 00:00:00 2001 From: Joe Perches Date: Wed, 12 Sep 2012 20:12:19 -0700 Subject: 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 Acked-by: David S. Miller Tested-by: Jim Cromie Acked-by: Jason Baron Signed-off-by: Greg Kroah-Hartman --- include/linux/netdevice.h | 3 --- lib/dynamic_debug.c | 26 +++++++++++++++++++++++--- net/core/dev.c | 24 +++++++++++++++++------- 3 files changed, 40 insertions(+), 13 deletions(-) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 59dc05f38247..5f49cc0a107e 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -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, ...); diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c index 29ff2e4cfb75..2a29f4e04bdf 100644 --- a/lib/dynamic_debug.c +++ b/lib/dynamic_debug.c @@ -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; diff --git a/net/core/dev.c b/net/core/dev.c index d7fe32c946c1..ac890f14613a 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -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; \ -- cgit v1.2.3-58-ga151