[PATCH net-next 1/3] ipv6: replace global gc_args with local variable

From: Michal Kubecek
Date: Fri Mar 04 2016 - 05:59:30 EST


Global variable gc_args is only used in fib6_run_gc() and functions
called from it. As fib6_run_gc() makes sure there is at most one
instance of fib6_clean_all() running at any moment, we can replace
gc_args with a local variable which will be needed once multiple
instances (per netns) of garbage collector are allowed.

Signed-off-by: Michal Kubecek <mkubecek@xxxxxxx>
---
net/ipv6/ip6_fib.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index 0c7e276c230e..d7c715accac9 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -1725,14 +1725,15 @@ static void fib6_flush_trees(struct net *net)
* Garbage collection
*/

-static struct fib6_gc_args
+struct fib6_gc_args
{
int timeout;
int more;
-} gc_args;
+};

static int fib6_age(struct rt6_info *rt, void *arg)
{
+ struct fib6_gc_args *gc_args = arg;
unsigned long now = jiffies;

/*
@@ -1748,10 +1749,10 @@ static int fib6_age(struct rt6_info *rt, void *arg)
RT6_TRACE("expiring %p\n", rt);
return -1;
}
- gc_args.more++;
+ gc_args->more++;
} else if (rt->rt6i_flags & RTF_CACHE) {
if (atomic_read(&rt->dst.__refcnt) == 0 &&
- time_after_eq(now, rt->dst.lastuse + gc_args.timeout)) {
+ time_after_eq(now, rt->dst.lastuse + gc_args->timeout)) {
RT6_TRACE("aging clone %p\n", rt);
return -1;
} else if (rt->rt6i_flags & RTF_GATEWAY) {
@@ -1769,7 +1770,7 @@ static int fib6_age(struct rt6_info *rt, void *arg)
return -1;
}
}
- gc_args.more++;
+ gc_args->more++;
}

return 0;
@@ -1779,6 +1780,7 @@ static DEFINE_SPINLOCK(fib6_gc_lock);

void fib6_run_gc(unsigned long expires, struct net *net, bool force)
{
+ struct fib6_gc_args gc_args;
unsigned long now;

if (force) {
@@ -1792,7 +1794,7 @@ void fib6_run_gc(unsigned long expires, struct net *net, bool force)

gc_args.more = icmp6_dst_gc();

- fib6_clean_all(net, fib6_age, NULL);
+ fib6_clean_all(net, fib6_age, &gc_args);
now = jiffies;
net->ipv6.ip6_rt_last_gc = now;

--
2.7.2