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ethtool: reduce stack usage with clang

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commit 3499e87ea0 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@arndb.de>
Reviewed-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Miles Chen <miles.chen@mediatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Arnd Bergmann
2019-03-07 16:58:35 +01:00
committed by Chris
parent 4018a4f0bc
commit e76bab4ab1
1 changed files with 9 additions and 7 deletions
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16
net/core/ethtool.c
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@@ -2332,9 +2332,10 @@ out:
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;
@@ -2364,9 +2365,10 @@ static int ethtool_get_per_queue_coalesce(struct net_device *dev,
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;
@@ -2423,7 +2425,7 @@ 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;