[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20200116231713.857936861@linuxfoundation.org>
Date: Fri, 17 Jan 2020 00:17:38 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
Michal Kubecek <mkubecek@...e.cz>,
"David S. Miller" <davem@...emloft.net>,
Miles Chen <miles.chen@...iatek.com>
Subject: [PATCH 4.19 04/84] ethtool: reduce stack usage with clang
From: Arnd Bergmann <arnd@...db.de>
commit 3499e87ea0413ee5b2cc028f4c8ed4d424bc7f98 upstream.
clang inlines the dev_ethtool() more aggressively than gcc does, leading
to a larger amount of used stack space:
net/core/ethtool.c:2536:24: error: stack frame size of 1216 bytes in function 'dev_ethtool' [-Werror,-Wframe-larger-than=]
Marking the sub-functions that require the most stack space as
noinline_for_stack gives us reasonable behavior on all compilers.
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Reviewed-by: Michal Kubecek <mkubecek@...e.cz>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Miles Chen <miles.chen@...iatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
net/core/ethtool.c | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -2413,9 +2413,10 @@ static int ethtool_set_tunable(struct ne
return ret;
}
-static int ethtool_get_per_queue_coalesce(struct net_device *dev,
- void __user *useraddr,
- struct ethtool_per_queue_op *per_queue_opt)
+static noinline_for_stack int
+ethtool_get_per_queue_coalesce(struct net_device *dev,
+ void __user *useraddr,
+ struct ethtool_per_queue_op *per_queue_opt)
{
u32 bit;
int ret;
@@ -2443,9 +2444,10 @@ static int ethtool_get_per_queue_coalesc
return 0;
}
-static int ethtool_set_per_queue_coalesce(struct net_device *dev,
- void __user *useraddr,
- struct ethtool_per_queue_op *per_queue_opt)
+static noinline_for_stack int
+ethtool_set_per_queue_coalesce(struct net_device *dev,
+ void __user *useraddr,
+ struct ethtool_per_queue_op *per_queue_opt)
{
u32 bit;
int i, ret = 0;
@@ -2499,7 +2501,7 @@ roll_back:
return ret;
}
-static int ethtool_set_per_queue(struct net_device *dev,
+static int noinline_for_stack ethtool_set_per_queue(struct net_device *dev,
void __user *useraddr, u32 sub_cmd)
{
struct ethtool_per_queue_op per_queue_opt;
Powered by blists - more mailing lists