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

From: Stephen Rothwell <[email-masked]>
Date: Tue, 9 Apr 2024 11:40:28 +1000

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:4703:2:
include/linux/compiler_types.h:460:45: error: call to '__compiletime_assert_940' declared with attribute error: BUILD_BUG_ON failed: offsetof(struct tcp_sock, __cacheline_group_end__tcp_sock_write_txrx) - offsetofend(struct tcp_sock, __cacheline_group_begin__tcp_sock_write_txrx) > 92
  460 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
      |                                             ^
include/linux/compiler_types.h:441:25: note: in definition of macro '__compiletime_assert'
  441 |                         prefix ## suffix();                             \
      |                         ^~~~~~
include/linux/compiler_types.h:460:9: note: in expansion of macro '_compiletime_assert'
  460 |         _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:4673:9: note: in expansion of macro 'CACHELINE_ASSERT_GROUP_SIZE'
 4673 |         CACHELINE_ASSERT_GROUP_SIZE(struct tcp_sock, tcp_sock_write_txrx, 92);
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~

Presumably caused by commit

  d2c3a7eb1afa ("tcp: more struct tcp_sock adjustments")

I have reverted that commit for today.

-- 
Cheers,
Stephen Rothwell