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authorBob Copeland <me@bobcopeland.com>2016-03-02 10:09:19 -0500
committerJohannes Berg <johannes.berg@intel.com>2016-04-05 10:56:32 +0200
commit8f6fd83c6c5ec66a4a70c728535ddcdfef4f3697 (patch)
tree5b5a00794c61ddd351c11b2a928e1796290896c7 /lib/rhashtable.c
parent947c2a0eccec29fcd30e717787e65792b1e607ed (diff)
downloadlinux-8f6fd83c6c5ec66a4a70c728535ddcdfef4f3697.tar.bz2
rhashtable: accept GFP flags in rhashtable_walk_init
In certain cases, the 802.11 mesh pathtable code wants to iterate over all of the entries in the forwarding table from the receive path, which is inside an RCU read-side critical section. Enable walks inside atomic sections by allowing GFP_ATOMIC allocations for the walker state. Change all existing callsites to pass in GFP_KERNEL. Acked-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: Bob Copeland <me@bobcopeland.com> [also adjust gfs2/glock.c and rhashtable tests] Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'lib/rhashtable.c')
-rw-r--r--lib/rhashtable.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/lib/rhashtable.c b/lib/rhashtable.c
index cc808707d1cf..5d845ffd7982 100644
--- a/lib/rhashtable.c
+++ b/lib/rhashtable.c
@@ -487,6 +487,7 @@ EXPORT_SYMBOL_GPL(rhashtable_insert_slow);
* rhashtable_walk_init - Initialise an iterator
* @ht: Table to walk over
* @iter: Hash table Iterator
+ * @gfp: GFP flags for allocations
*
* This function prepares a hash table walk.
*
@@ -504,14 +505,15 @@ EXPORT_SYMBOL_GPL(rhashtable_insert_slow);
* You must call rhashtable_walk_exit if this function returns
* successfully.
*/
-int rhashtable_walk_init(struct rhashtable *ht, struct rhashtable_iter *iter)
+int rhashtable_walk_init(struct rhashtable *ht, struct rhashtable_iter *iter,
+ gfp_t gfp)
{
iter->ht = ht;
iter->p = NULL;
iter->slot = 0;
iter->skip = 0;
- iter->walker = kmalloc(sizeof(*iter->walker), GFP_KERNEL);
+ iter->walker = kmalloc(sizeof(*iter->walker), gfp);
if (!iter->walker)
return -ENOMEM;