From a5b5bb9a053a973c23b867738c074acb3e80c0a0 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Mon, 3 Jul 2006 00:25:35 -0700 Subject: [PATCH] lockdep: annotate sk_locks Teach sk_lock semantics to the lock validator. In the softirq path the slock has mutex_trylock()+mutex_unlock() semantics, in the process context sock_lock() case it has mutex_lock()/mutex_unlock() semantics. Thus we treat sock_owned_by_user() flagged areas as an exclusion area too, not just those areas covered by a held sk_lock.slock. Effect on non-lockdep kernels: minimal, sk_lock_sock_init() has been turned into an inline function. Signed-off-by: Ingo Molnar Cc: Arjan van de Ven Cc: "David S. Miller" Cc: Herbert Xu Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/net/sock.h | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) (limited to 'include/net') diff --git a/include/net/sock.h b/include/net/sock.h index 0969fb60d6e..324b3ea233d 100644 --- a/include/net/sock.h +++ b/include/net/sock.h @@ -44,6 +44,7 @@ #include #include #include +#include #include #include /* struct sk_buff */ #include @@ -78,18 +79,17 @@ typedef struct { spinlock_t slock; struct sock_iocb *owner; wait_queue_head_t wq; + /* + * We express the mutex-alike socket_lock semantics + * to the lock validator by explicitly managing + * the slock as a lock variant (in addition to + * the slock itself): + */ +#ifdef CONFIG_DEBUG_LOCK_ALLOC + struct lockdep_map dep_map; +#endif } socket_lock_t; -extern struct lock_class_key af_family_keys[AF_MAX]; - -#define sock_lock_init(__sk) \ -do { spin_lock_init(&((__sk)->sk_lock.slock)); \ - lockdep_set_class(&(__sk)->sk_lock.slock, \ - af_family_keys + (__sk)->sk_family); \ - (__sk)->sk_lock.owner = NULL; \ - init_waitqueue_head(&((__sk)->sk_lock.wq)); \ -} while(0) - struct sock; struct proto; -- cgit v1.2.3