netdev - [PATCH bpf-next] bpf: align struct bpf_prog

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Message-Id: <20191011181140.2898-1-edumazet@google.com>
Date:   Fri, 11 Oct 2019 11:11:40 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Cc:     "David S . Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        bpf <bpf@...r.kernel.org>
Subject: [PATCH bpf-next] bpf: align struct bpf_prog_stats

Do not risk spanning these small structures on two cache lines.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 include/linux/bpf.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 5b9d2233860654512da6ff5ec8bf56f2343ed722..282e28bf41ec627cad63c6b5bc3f439dc5f58f56 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -363,7 +363,7 @@ struct bpf_prog_stats {
 	u64 cnt;
 	u64 nsecs;
 	struct u64_stats_sync syncp;
-};
+} __aligned(2 * sizeof(u64));
 
 struct bpf_prog_aux {
 	atomic_t refcnt;
-- 
2.23.0.700.g56cf767bdb-goog