netdev - [PATCH v4 net-next 2/6] cache: enforce cache groups

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Message-ID: <20231026081959.3477034-3-lixiaoyan@google.com>
Date: Thu, 26 Oct 2023 08:19:55 +0000
From: Coco Li <lixiaoyan@...gle.com>
To: Jakub Kicinski <kuba@...nel.org>, Eric Dumazet <edumazet@...gle.com>, 
	Neal Cardwell <ncardwell@...gle.com>, Mubashir Adnan Qureshi <mubashirq@...gle.com>, 
	Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew@...n.ch>, Jonathan Corbet <corbet@....net>, 
	David Ahern <dsahern@...nel.org>, Daniel Borkmann <daniel@...earbox.net>
Cc: netdev@...r.kernel.org, Chao Wu <wwchao@...gle.com>, Wei Wang <weiwan@...gle.com>, 
	Pradeep Nemavat <pnemavat@...gle.com>, Coco Li <lixiaoyan@...gle.com>
Subject: [PATCH v4 net-next 2/6] cache: enforce cache groups

Set up build time warnings to safegaurd against future header changes of
organized structs.

Signed-off-by: Coco Li <lixiaoyan@...gle.com>
Suggested-by: Daniel Borkmann <daniel@...earbox.net>
Acked-by: Daniel Borkmann <daniel@...earbox.net>
---
 include/linux/cache.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/include/linux/cache.h b/include/linux/cache.h
index 9900d20b76c28..4e547beccd6a5 100644
--- a/include/linux/cache.h
+++ b/include/linux/cache.h
@@ -85,6 +85,24 @@
 #define cache_line_size()	L1_CACHE_BYTES
 #endif
 
+#ifndef __cacheline_group_begin
+#define __cacheline_group_begin(GROUP) \
+	__u8 __cacheline_group_begin__##GROUP[0]
+#endif
+
+#ifndef __cacheline_group_end
+#define __cacheline_group_end(GROUP) \
+	__u8 __cacheline_group_end__##GROUP[0]
+#endif
+
+#ifndef CACHELINE_ASSERT_GROUP_MEMBER
+#define CACHELINE_ASSERT_GROUP_MEMBER(TYPE, GROUP, MEMBER) \
+	BUILD_BUG_ON(!(offsetof(TYPE, MEMBER) >= \
+		       offsetofend(TYPE, __cacheline_group_begin__##GROUP) && \
+		       offsetofend(TYPE, MEMBER) <= \
+		       offsetof(TYPE, __cacheline_group_end__##GROUP)))
+#endif
+
 /*
  * Helper to add padding within a struct to ensure data fall into separate
  * cachelines.
-- 
2.42.0.758.gaed0368e0e-goog