netdev - linux-next: build failure after merge of the net-next tree

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Date: Fri, 1 Mar 2024 12:11:08 +1100
From: Stephen Rothwell <sfr@...b.auug.org.au>
To: David Miller <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Networking <netdev@...r.kernel.org>
Cc: Eric Dumazet <edumazet@...gle.com>, Jiri Pirko <jiri@...dia.com>, Linux
 Kernel Mailing List <linux-kernel@...r.kernel.org>, Linux Next Mailing List
 <linux-next@...r.kernel.org>
Subject: linux-next: build failure after merge of the net-next tree

Hi all,

After merging the net-next tree, today's linux-next build (arm
multi_v7_defconfig) failed like this:

In file included from <command-line>:
In function 'tcp_struct_check',
    inlined from 'tcp_init' at net/ipv4/tcp.c:4700:2:
include/linux/compiler_types.h:442:45: error: call to '__compiletime_assert_940' declared with attribute error: BUILD_BUG_ON failed: offsetof(struct tcp_sock, __cacheline_group_end__tcp_sock_write_rx) - offsetofend(struct tcp_sock, __cacheline_group_begin__tcp_sock_write_rx) > 99
  442 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
      |                                             ^
include/linux/compiler_types.h:423:25: note: in definition of macro '__compiletime_assert'
  423 |                         prefix ## suffix();                             \
      |                         ^~~~~~
include/linux/compiler_types.h:442:9: note: in expansion of macro '_compiletime_assert'
  442 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
      |         ^~~~~~~~~~~~~~~~~~~
include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
   39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
      |                                     ^~~~~~~~~~~~~~~~~~
include/linux/build_bug.h:50:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
   50 |         BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
      |         ^~~~~~~~~~~~~~~~
include/linux/cache.h:108:9: note: in expansion of macro 'BUILD_BUG_ON'
  108 |         BUILD_BUG_ON(offsetof(TYPE, __cacheline_group_end__##GROUP) - \
      |         ^~~~~~~~~~~~
net/ipv4/tcp.c:4687:9: note: in expansion of macro 'CACHELINE_ASSERT_GROUP_SIZE'
 4687 |         CACHELINE_ASSERT_GROUP_SIZE(struct tcp_sock, tcp_sock_write_rx, 99);
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~

Caused by commit

  99123622050f ("tcp: remove some holes in struct tcp_sock")

I have reverted that commit for today.

-- 
Cheers,
Stephen Rothwell

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