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rhashtable: Add parent argument to mutex_is_held 

Currently mutex_is_held can only test locks in the that are global
since it takes no arguments.  This prevents rhashtable from being
used in places where locks are lock, e.g., per-namespace locks.

This patch adds a parent field to mutex_is_held and rhashtable_params
so that local locks can be used (and tested).

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2014-11-13 18:11:22 +08:00 committed by David S. Miller
parent 1b2f309d70
commit 7b4ce23534
4 changed files with 6 additions and 5 deletions
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3
include/linux/rhashtable.h
View File

@ -66,7 +66,8 @@ struct rhashtable_params {
bool (*shrink_decision)(const struct rhashtable *ht,
size_t new_size);
#ifdef CONFIG_PROVE_LOCKING
int (*mutex_is_held)(void);
int (*mutex_is_held)(void *parent);
void *parent;
#endif
};

4
lib/rhashtable.c
View File

@ -32,7 +32,7 @@
#ifdef CONFIG_PROVE_LOCKING
int lockdep_rht_mutex_is_held(const struct rhashtable *ht)
{
return ht->p.mutex_is_held();
return ht->p.mutex_is_held(ht->p.parent);
}
EXPORT_SYMBOL_GPL(lockdep_rht_mutex_is_held);
#endif
@ -618,7 +618,7 @@ EXPORT_SYMBOL_GPL(rhashtable_destroy);
#define TEST_NEXPANDS 4
#ifdef CONFIG_PROVE_LOCKING
static int test_mutex_is_held(void)
static int test_mutex_is_held(void *parent)
{
return 1;
}

2
net/netfilter/nft_hash.c
View File

@ -154,7 +154,7 @@ static unsigned int nft_hash_privsize(const struct nlattr * const nla[])
}
#ifdef CONFIG_PROVE_LOCKING
static int lockdep_nfnl_lock_is_held(void)
static int lockdep_nfnl_lock_is_held(void *parent)
{
return lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES);
}

2
net/netlink/af_netlink.c
View File

@ -115,7 +115,7 @@ DEFINE_MUTEX(nl_sk_hash_lock);
EXPORT_SYMBOL_GPL(nl_sk_hash_lock);
#ifdef CONFIG_PROVE_LOCKING
static int lockdep_nl_sk_hash_is_held(void)
static int lockdep_nl_sk_hash_is_held(void *parent)
{
if (debug_locks)
return lockdep_is_held(&nl_sk_hash_lock) || lockdep_is_held(&nl_table_lock);