From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Dumazet Subject: [PATCH net-next-2.6] ethtool: reduce stack usage Date: Mon, 15 Feb 2010 15:24:00 +0100 Message-ID: <1266243840.8262.14.camel@edumazet-laptop> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Cc: netdev To: David Miller Return-path: Received: from mail-bw0-f213.google.com ([209.85.218.213]:46908 "EHLO mail-bw0-f213.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755244Ab0BOOYJ (ORCPT ); Mon, 15 Feb 2010 09:24:09 -0500 Received: by bwz5 with SMTP id 5so1033507bwz.1 for ; Mon, 15 Feb 2010 06:24:06 -0800 (PST) Sender: netdev-owner@vger.kernel.org List-ID: 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 --- net/core/ethtool.c | 35 ++++++++++++++++++++++++++++------- 1 files changed, 28 insertions(+), 7 deletions(-) diff --git a/net/core/ethtool.c b/net/core/ethtool.c index a1280f6..eb41ef6 100644 --- a/net/core/ethtool.c +++ b/net/core/ethtool.c @@ -191,7 +191,10 @@ 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; @@ -226,7 +229,10 @@ 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; @@ -239,7 +245,10 @@ 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; @@ -314,7 +323,10 @@ static int __rx_ntuple_filter_add(struct ethtool_rx_ntuple_list *list, return 0; } -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; @@ -777,7 +789,10 @@ 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 }; @@ -791,7 +806,10 @@ 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; @@ -1201,7 +1219,10 @@ 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;