From b9ebafbe8cfeeddec881504c446cccd0d87a51b6 Mon Sep 17 00:00:00 2001
From: Eric Dumazet <edumazet@google.com>
Date: Fri, 20 Feb 2015 06:48:57 -0800
Subject: [PATCH] rhashtable: ensure cache line alignment on bucket_table
struct bucket_table contains mostly read fields :
size, locks_mask, locks.
Make sure these are not sharing a cache line with buckets[]
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
include/linux/rhashtable.h | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/include/linux/rhashtable.h b/include/linux/rhashtable.h
index 58851275fed98..cb2104be2135d 100644
--- a/include/linux/rhashtable.h
+++ b/include/linux/rhashtable.h
@@ -54,10 +54,11 @@ struct rhash_head {
* @buckets: size * hash buckets
*/
struct bucket_table {
- size_t size;
- unsigned int locks_mask;
- spinlock_t *locks;
- struct rhash_head __rcu *buckets[];
+ size_t size;
+ unsigned int locks_mask;
+ spinlock_t *locks;
+
+ struct rhash_head __rcu *buckets[] ____cacheline_aligned_in_smp;
};
typedef u32 (*rht_hashfn_t)(const void *data, u32 len, u32 seed);
--
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