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authorNeilBrown <neilb@suse.com>2019-04-12 11:52:08 +1000
committerDavid S. Miller <davem@davemloft.net>2019-04-12 17:34:45 -0700
commitadc6a3ab192eb40fb9d8b093c87d9aa785af4513 (patch)
tree6aae93c08ed6295e47300fbe11dc010ee1b32a1d /lib/test_rhashtable.c
parentc5783311a1248c437614d438b69c5f31fe483ecb (diff)
downloadlinux-adc6a3ab192eb40fb9d8b093c87d9aa785af4513.tar.gz
rhashtable: move dereference inside rht_ptr()
Rather than dereferencing a pointer to a bucket and then passing the result to rht_ptr(), we now pass in the pointer and do the dereference in rht_ptr(). This requires that we pass in the tbl and hash as well to support RCU checks, and means that the various rht_for_each functions can expect a pointer that can be dereferenced without further care. There are two places where we dereference a bucket pointer where there is no testable protection - in each case we know that we much have exclusive access without having taken a lock. The previous code used rht_dereference() to pretend that holding the mutex provided protects, but holding the mutex never provides protection for accessing buckets. So instead introduce rht_ptr_exclusive() that can be used when there is known to be exclusive access without holding any locks. Signed-off-by: NeilBrown <neilb@suse.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'lib/test_rhashtable.c')
-rw-r--r--lib/test_rhashtable.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/test_rhashtable.c b/lib/test_rhashtable.c
index 02592c2a249c..084fe5a6ac57 100644
--- a/lib/test_rhashtable.c
+++ b/lib/test_rhashtable.c
@@ -500,7 +500,7 @@ static unsigned int __init print_ht(struct rhltable *rhlt)
struct rhash_head *pos, *next;
struct test_obj_rhl *p;
- pos = rht_ptr(rht_dereference(tbl->buckets[i], ht));
+ pos = rht_ptr_exclusive(tbl->buckets + i);
next = !rht_is_a_nulls(pos) ? rht_dereference(pos->next, ht) : NULL;
if (!rht_is_a_nulls(pos)) {