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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2015-12-08 17:09:04 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-12-08 22:46:32 -0500 |
| commit | 46c749eac979c0bf280f760971367e9babe4d05f (patch) | |
| tree | 60245bd86dd38b65047283899ac739af1a534e52 | |
| parent | bc22ff5363b1842b0507c4eefefde7748dbc7032 (diff) | |
| download | linux-stable-46c749eac979c0bf280f760971367e9babe4d05f.tar.gz linux-stable-46c749eac979c0bf280f760971367e9babe4d05f.tar.bz2 linux-stable-46c749eac979c0bf280f760971367e9babe4d05f.zip | |
rhashtable: Remove unnecessary wmb for future_tbl
The patch 9497df88ab5567daa001829051c5f87161a81ff0 ("rhashtable:
Fix reader/rehash race") added a pair of barriers. In fact the
wmb is superfluous because every subsequent write to the old or
new hash table uses rcu_assign_pointer, which itself carriers a
full barrier prior to the assignment.
Therefore we may remove the explicit wmb.
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>
| -rw-r--r-- | lib/rhashtable.c | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/lib/rhashtable.c b/lib/rhashtable.c index a54ff8949f91..0f3be3fad2b2 100644 --- a/lib/rhashtable.c +++ b/lib/rhashtable.c @@ -231,9 +231,6 @@ static int rhashtable_rehash_attach(struct rhashtable *ht, */ rcu_assign_pointer(old_tbl->future_tbl, new_tbl); - /* Ensure the new table is visible to readers. */ - smp_wmb(); - spin_unlock_bh(old_tbl->locks); return 0; |