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Commit f1d33063 authored by Greg Kroah-Hartman's avatar Greg Kroah-Hartman
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Revert "ipv6: make ip6_rt_gc_expire an atomic_t" 



This reverts commit b4cfbeae which is
commit 9cb7c013420f98fa6fd12fc6a5dc055170c108db upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: Idad46376e176f54a1d6781bdb432131bed7844f2
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@google.com>
parent 9aada1f3

include/net/netns/ipv6.h

+2 −2
Original line number Diff line number Diff line
@@ -72,7 +72,7 @@ struct netns_ipv6 { 
	struct dst_ops		ip6_dst_ops;

	rwlock_t		fib6_walker_lock;

	spinlock_t		fib6_gc_lock;

	atomic_t		ip6_rt_gc_expire;

	unsigned int		 ip6_rt_gc_expire;

	unsigned long		 ip6_rt_last_gc;

#ifdef CONFIG_IPV6_MULTIPLE_TABLES

	unsigned int		fib6_rules_require_fldissect;

net/ipv6/route.c

+5 −6
Original line number Diff line number Diff line
@@ -2775,7 +2775,6 @@ static int ip6_dst_gc(struct dst_ops *ops) 
	int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;

	int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;

	unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;

	unsigned int val;

	int entries;



	entries = dst_entries_get_fast(ops);
@@ -2786,13 +2785,13 @@ static int ip6_dst_gc(struct dst_ops *ops) 
	    entries <= rt_max_size)

		goto out;



	fib6_run_gc(atomic_inc_return(&net->ipv6.ip6_rt_gc_expire), net, true);

	net->ipv6.ip6_rt_gc_expire++;

	fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);

	entries = dst_entries_get_slow(ops);

	if (entries < ops->gc_thresh)

		atomic_set(&net->ipv6.ip6_rt_gc_expire, rt_gc_timeout >> 1);

		net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;

out:

	val = atomic_read(&net->ipv6.ip6_rt_gc_expire);

	atomic_set(&net->ipv6.ip6_rt_gc_expire, val - (val >> rt_elasticity));

	net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;

	return entries > rt_max_size;

}
@@ -5321,7 +5320,7 @@ static int __net_init ip6_route_net_init(struct net *net) 
	net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;

	net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;



	atomic_set(&net->ipv6.ip6_rt_gc_expire, 30*HZ);

	net->ipv6.ip6_rt_gc_expire = 30*HZ;



	ret = 0;

out: