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authorHerbert Xu <herbert@gondor.apana.org.au>2015-03-23 16:50:27 +0300
committerDavid S. Miller <davem@davemloft.net>2015-03-24 05:07:52 +0300
commitb9ecfdaa1090b5988422eaf5348ea1954d2d7219 (patch)
treec2721bb2c9be54c153869b0ed3b68bbee0bfc70a /lib
parentb824478b2145be78ac19e1cf44e2b9036c7a9608 (diff)
downloadlinux-b9ecfdaa1090b5988422eaf5348ea1954d2d7219.tar.xz
rhashtable: Allow GFP_ATOMIC bucket table allocation
This patch adds the ability to allocate bucket table with GFP_ATOMIC instead of GFP_KERNEL. This is needed when we perform an immediate rehash during insertion. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Acked-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'lib')
-rw-r--r--lib/rhashtable.c26
1 files changed, 15 insertions, 11 deletions
diff --git a/lib/rhashtable.c b/lib/rhashtable.c
index 5e04403e25f5..220a11a13d40 100644
--- a/lib/rhashtable.c
+++ b/lib/rhashtable.c
@@ -58,7 +58,8 @@ EXPORT_SYMBOL_GPL(lockdep_rht_bucket_is_held);
#endif
-static int alloc_bucket_locks(struct rhashtable *ht, struct bucket_table *tbl)
+static int alloc_bucket_locks(struct rhashtable *ht, struct bucket_table *tbl,
+ gfp_t gfp)
{
unsigned int i, size;
#if defined(CONFIG_PROVE_LOCKING)
@@ -75,12 +76,13 @@ static int alloc_bucket_locks(struct rhashtable *ht, struct bucket_table *tbl)
if (sizeof(spinlock_t) != 0) {
#ifdef CONFIG_NUMA
- if (size * sizeof(spinlock_t) > PAGE_SIZE)
+ if (size * sizeof(spinlock_t) > PAGE_SIZE &&
+ gfp == GFP_KERNEL)
tbl->locks = vmalloc(size * sizeof(spinlock_t));
else
#endif
tbl->locks = kmalloc_array(size, sizeof(spinlock_t),
- GFP_KERNEL);
+ gfp);
if (!tbl->locks)
return -ENOMEM;
for (i = 0; i < size; i++)
@@ -105,23 +107,25 @@ static void bucket_table_free_rcu(struct rcu_head *head)
}
static struct bucket_table *bucket_table_alloc(struct rhashtable *ht,
- size_t nbuckets)
+ size_t nbuckets,
+ gfp_t gfp)
{
struct bucket_table *tbl = NULL;
size_t size;
int i;
size = sizeof(*tbl) + nbuckets * sizeof(tbl->buckets[0]);
- if (size <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER))
- tbl = kzalloc(size, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
- if (tbl == NULL)
+ if (size <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER) ||
+ gfp != GFP_KERNEL)
+ tbl = kzalloc(size, gfp | __GFP_NOWARN | __GFP_NORETRY);
+ if (tbl == NULL && gfp == GFP_KERNEL)
tbl = vzalloc(size);
if (tbl == NULL)
return NULL;
tbl->size = nbuckets;
- if (alloc_bucket_locks(ht, tbl) < 0) {
+ if (alloc_bucket_locks(ht, tbl, gfp) < 0) {
bucket_table_free(tbl);
return NULL;
}
@@ -288,7 +292,7 @@ static int rhashtable_expand(struct rhashtable *ht)
old_tbl = rhashtable_last_table(ht, old_tbl);
- new_tbl = bucket_table_alloc(ht, old_tbl->size * 2);
+ new_tbl = bucket_table_alloc(ht, old_tbl->size * 2, GFP_KERNEL);
if (new_tbl == NULL)
return -ENOMEM;
@@ -332,7 +336,7 @@ static int rhashtable_shrink(struct rhashtable *ht)
if (rht_dereference(old_tbl->future_tbl, ht))
return -EEXIST;
- new_tbl = bucket_table_alloc(ht, size);
+ new_tbl = bucket_table_alloc(ht, size, GFP_KERNEL);
if (new_tbl == NULL)
return -ENOMEM;
@@ -689,7 +693,7 @@ int rhashtable_init(struct rhashtable *ht,
}
}
- tbl = bucket_table_alloc(ht, size);
+ tbl = bucket_table_alloc(ht, size, GFP_KERNEL);
if (tbl == NULL)
return -ENOMEM;