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authorNeilBrown <neilb@suse.com>2019-04-02 10:07:45 +1100
committerDavid S. Miller <davem@davemloft.net>2019-04-07 19:12:12 -0700
commitff302db965b57c141297911ea647d36d11fedfbe (patch)
tree4b6cdddf64de3c58e867a1886e5240c078df121b /include/linux/rhashtable.h
parent7a41c294c1463100fdc82a356e22e36bbaa6b0f9 (diff)
rhashtable: allow rht_bucket_var to return NULL.
Rather than returning a pointer to a static nulls, rht_bucket_var() now returns NULL if the bucket doesn't exist. This will make the next patch, which stores a bitlock in the bucket pointer, somewhat cleaner. This change involves introducing __rht_bucket_nested() which is like rht_bucket_nested(), but doesn't provide the static nulls, and changing rht_bucket_nested() to call this and possible provide a static nulls - as is still needed for the non-var case. Signed-off-by: NeilBrown <neilb@suse.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/rhashtable.h')
-rw-r--r--include/linux/rhashtable.h11
1 files changed, 9 insertions, 2 deletions
diff --git a/include/linux/rhashtable.h b/include/linux/rhashtable.h
index 86dfa417848d..0c9175aeab8a 100644
--- a/include/linux/rhashtable.h
+++ b/include/linux/rhashtable.h
@@ -265,6 +265,8 @@ void rhashtable_destroy(struct rhashtable *ht);
struct rhash_head __rcu **rht_bucket_nested(const struct bucket_table *tbl,
unsigned int hash);
+struct rhash_head __rcu **__rht_bucket_nested(const struct bucket_table *tbl,
+ unsigned int hash);
struct rhash_head __rcu **rht_bucket_nested_insert(struct rhashtable *ht,
struct bucket_table *tbl,
unsigned int hash);
@@ -294,7 +296,7 @@ static inline struct rhash_head __rcu *const *rht_bucket(
static inline struct rhash_head __rcu **rht_bucket_var(
struct bucket_table *tbl, unsigned int hash)
{
- return unlikely(tbl->nest) ? rht_bucket_nested(tbl, hash) :
+ return unlikely(tbl->nest) ? __rht_bucket_nested(tbl, hash) :
&tbl->buckets[hash];
}
@@ -890,6 +892,8 @@ static inline int __rhashtable_remove_fast_one(
spin_lock_bh(lock);
pprev = rht_bucket_var(tbl, hash);
+ if (!pprev)
+ goto out;
rht_for_each_from(he, *pprev, tbl, hash) {
struct rhlist_head *list;
@@ -934,6 +938,7 @@ static inline int __rhashtable_remove_fast_one(
break;
}
+out:
spin_unlock_bh(lock);
if (err > 0) {
@@ -1042,6 +1047,8 @@ static inline int __rhashtable_replace_fast(
spin_lock_bh(lock);
pprev = rht_bucket_var(tbl, hash);
+ if (!pprev)
+ goto out;
rht_for_each_from(he, *pprev, tbl, hash) {
if (he != obj_old) {
pprev = &he->next;
@@ -1053,7 +1060,7 @@ static inline int __rhashtable_replace_fast(
err = 0;
break;
}
-
+out:
spin_unlock_bh(lock);
return err;