[PATCH 6.1 169/312] netfilter: Reorder fields in struct nf_conntrack_expect

Greg Kroah-Hartman
2026-04-08T18:14:06Z

From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>

[ Upstream commit 61e03e912da8212c3de2529054502e8388dfd484 ]

Group some variables based on their sizes to reduce holes.
On x86_64, this shrinks the size of 'struct nf_conntrack_expect' from 264
to 256 bytes.

This structure deserve a dedicated cache, so reducing its size looks nice.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Stable-dep-of: 917b61fa2042 ("netfilter: ctnetlink: ignore explicit helper on new expectations")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
include/net/netfilter/nf_conntrack_expect.h | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/include/net/netfilter/nf_conntrack_expect.h b/include/net/netfilter/nf_conntrack_expect.h
index f642a87ea330a..165e7a03b8e9d 100644
--- a/include/net/netfilter/nf_conntrack_expect.h
+++ b/include/net/netfilter/nf_conntrack_expect.h
@@ -26,6 +26,15 @@ struct nf_conntrack_expect {
struct nf_conntrack_tuple tuple;
struct nf_conntrack_tuple_mask mask;

+ /* Usage count. */
+ refcount_t use;
+
+ /* Flags */
+ unsigned int flags;
+
+ /* Expectation class */
+ unsigned int class;
+
/* Function to call after setup and insertion */
void (*expectfn)(struct nf_conn *new,
struct nf_conntrack_expect *this);
@@ -39,15 +48,6 @@ struct nf_conntrack_expect {
/* Timer function; deletes the expectation. */
struct timer_list timeout;

- /* Usage count. */
- refcount_t use;
-
- /* Flags */
- unsigned int flags;
-
- /* Expectation class */
- unsigned int class;
-
#if IS_ENABLED(CONFIG_NF_NAT)
union nf_inet_addr saved_addr;
/* This is the original per-proto part, used to map the
--
2.53.0