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ipv6: mcast: RCU conversion

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ipv6_sk_mc_lock rwlock becomes a spinlock.

readers (inet6_mc_check()) now takes rcu_read_lock() instead of read
lock. Writers dont need to disable BH anymore.

struct ipv6_mc_socklist objects are reclaimed after one RCU grace
period.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2010-11-23 13:12:15 +00:00 • committed by David S. Miller
parent 2757a15f08
commit 456b61bca8
3 changed files with 47 additions and 33 deletions
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3
include/net/if_inet6.h
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@ -89,10 +89,11 @@ struct ip6_sf_socklist {
struct ipv6_mc_socklist {
struct in6_addr addr;
int ifindex;
struct ipv6_mc_socklist *next;
struct ipv6_mc_socklist __rcu *next;
rwlock_t sflock;
unsigned int sfmode; /* MCAST_{INCLUDE,EXCLUDE} */
struct ip6_sf_socklist *sflist;
struct rcu_head rcu;
};
struct ip6_sf_list {