From 339c6e99853d2ef1f02ad8a313e079050a300427 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Mon, 15 Feb 2010 21:51:33 -0800 Subject: [PATCH] ethtool: reduce stack usage dev_ethtool() is currently using 604 bytes of stack, even with gcc-4.4.2 objdump -d vmlinux | scripts/checkstack.pl ... 0xc04bbc33 dev_ethtool [vmlinux]: 604 ... Adding noinline attributes to selected functions can reduce stack usage. Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- net/core/ethtool.c | 35 ++++++++++++++++++++++++++++------- 1 file changed, 28 insertions(+), 7 deletions(-) diff --git a/net/core/ethtool.c b/net/core/ethtool.c index 794cf57078cd..82cae3bca78d 100644 --- a/net/core/ethtool.c +++ b/net/core/ethtool.c @@ -197,7 +197,10 @@ static int ethtool_set_settings(struct net_device *dev, void __user *useraddr) return dev->ethtool_ops->set_settings(dev, &cmd); } -static int ethtool_get_drvinfo(struct net_device *dev, void __user *useraddr) +/* + * noinline attribute so that gcc doesnt use too much stack in dev_ethtool() + */ +static noinline int ethtool_get_drvinfo(struct net_device *dev, void __user *useraddr) { struct ethtool_drvinfo info; const struct ethtool_ops *ops = dev->ethtool_ops; @@ -232,7 +235,10 @@ static int ethtool_get_drvinfo(struct net_device *dev, void __user *useraddr) return 0; } -static int ethtool_set_rxnfc(struct net_device *dev, void __user *useraddr) +/* + * noinline attribute so that gcc doesnt use too much stack in dev_ethtool() + */ +static noinline int ethtool_set_rxnfc(struct net_device *dev, void __user *useraddr) { struct ethtool_rxnfc cmd; @@ -245,7 +251,10 @@ static int ethtool_set_rxnfc(struct net_device *dev, void __user *useraddr) return dev->ethtool_ops->set_rxnfc(dev, &cmd); } -static int ethtool_get_rxnfc(struct net_device *dev, void __user *useraddr) +/* + * noinline attribute so that gcc doesnt use too much stack in dev_ethtool() + */ +static noinline int ethtool_get_rxnfc(struct net_device *dev, void __user *useraddr) { struct ethtool_rxnfc info; const struct ethtool_ops *ops = dev->ethtool_ops; @@ -317,7 +326,10 @@ static void __rx_ntuple_filter_add(struct ethtool_rx_ntuple_list *list, list->count++; } -static int ethtool_set_rx_ntuple(struct net_device *dev, void __user *useraddr) +/* + * noinline attribute so that gcc doesnt use too much stack in dev_ethtool() + */ +static noinline int ethtool_set_rx_ntuple(struct net_device *dev, void __user *useraddr) { struct ethtool_rx_ntuple cmd; const struct ethtool_ops *ops = dev->ethtool_ops; @@ -788,7 +800,10 @@ static int ethtool_set_eeprom(struct net_device *dev, void __user *useraddr) return ret; } -static int ethtool_get_coalesce(struct net_device *dev, void __user *useraddr) +/* + * noinline attribute so that gcc doesnt use too much stack in dev_ethtool() + */ +static noinline int ethtool_get_coalesce(struct net_device *dev, void __user *useraddr) { struct ethtool_coalesce coalesce = { .cmd = ETHTOOL_GCOALESCE }; @@ -802,7 +817,10 @@ static int ethtool_get_coalesce(struct net_device *dev, void __user *useraddr) return 0; } -static int ethtool_set_coalesce(struct net_device *dev, void __user *useraddr) +/* + * noinline attribute so that gcc doesnt use too much stack in dev_ethtool() + */ +static noinline int ethtool_set_coalesce(struct net_device *dev, void __user *useraddr) { struct ethtool_coalesce coalesce; @@ -1212,7 +1230,10 @@ static int ethtool_set_value(struct net_device *dev, char __user *useraddr, return actor(dev, edata.data); } -static int ethtool_flash_device(struct net_device *dev, char __user *useraddr) +/* + * noinline attribute so that gcc doesnt use too much stack in dev_ethtool() + */ +static noinline int ethtool_flash_device(struct net_device *dev, char __user *useraddr) { struct ethtool_flash efl; -- GitLab