netdev - Re: [PATCH net-next 3/7] tcp: move tcp->rcv_tstamp to tcp_sock_write

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Message-ID: <202509191711.gDaSokkJ-lkp@intel.com>
Date: Fri, 19 Sep 2025 18:09:52 +0800
From: kernel test robot <lkp@...el.com>
To: Eric Dumazet <edumazet@...gle.com>,
	"David S . Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: oe-kbuild-all@...ts.linux.dev, Simon Horman <horms@...nel.org>,
	Neal Cardwell <ncardwell@...gle.com>,
	Willem de Bruijn <willemb@...gle.com>,
	Kuniyuki Iwashima <kuniyu@...gle.com>, netdev@...r.kernel.org,
	eric.dumazet@...il.com, Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH net-next 3/7] tcp: move tcp->rcv_tstamp to
 tcp_sock_write_txrx group

Hi Eric,

kernel test robot noticed the following build errors:

[auto build test ERROR on net-next/main]

url:    https://github.com/intel-lab-lkp/linux/commits/Eric-Dumazet/net-move-sk_uid-and-sk_protocol-to-sock_read_tx/20250919-000602
base:   net-next/main
patch link:    https://lore.kernel.org/r/20250918155532.751173-4-edumazet%40google.com
patch subject: [PATCH net-next 3/7] tcp: move tcp->rcv_tstamp to tcp_sock_write_txrx group
config: powerpc-ge_imp3a_defconfig (https://download.01.org/0day-ci/archive/20250919/202509191711.gDaSokkJ-lkp@intel.com/config)
compiler: powerpc-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250919/202509191711.gDaSokkJ-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202509191711.gDaSokkJ-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from <command-line>:
   In function 'tcp_struct_check',
       inlined from 'tcp_init' at net/ipv4/tcp.c:5204:2:
>> include/linux/compiler_types.h:572:45: error: call to '__compiletime_assert_1129' 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) > 107 + 4
     572 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |                                             ^
   include/linux/compiler_types.h:553:25: note: in definition of macro '__compiletime_assert'
     553 |                         prefix ## suffix();                             \
         |                         ^~~~~~
   include/linux/compiler_types.h:572:9: note: in expansion of macro '_compiletime_assert'
     572 |         _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:160:9: note: in expansion of macro 'BUILD_BUG_ON'
     160 |         BUILD_BUG_ON(offsetof(TYPE, __cacheline_group_end__##GROUP) - \
         |         ^~~~~~~~~~~~
   net/ipv4/tcp.c:5173:9: note: in expansion of macro 'CACHELINE_ASSERT_GROUP_SIZE'
    5173 |         CACHELINE_ASSERT_GROUP_SIZE(struct tcp_sock, tcp_sock_write_txrx, 107 + 4);
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/__compiletime_assert_1129 +572 include/linux/compiler_types.h

eb5c2d4b45e3d2 Will Deacon 2020-07-21  558  
eb5c2d4b45e3d2 Will Deacon 2020-07-21  559  #define _compiletime_assert(condition, msg, prefix, suffix) \
eb5c2d4b45e3d2 Will Deacon 2020-07-21  560  	__compiletime_assert(condition, msg, prefix, suffix)
eb5c2d4b45e3d2 Will Deacon 2020-07-21  561  
eb5c2d4b45e3d2 Will Deacon 2020-07-21  562  /**
eb5c2d4b45e3d2 Will Deacon 2020-07-21  563   * compiletime_assert - break build and emit msg if condition is false
eb5c2d4b45e3d2 Will Deacon 2020-07-21  564   * @condition: a compile-time constant condition to check
eb5c2d4b45e3d2 Will Deacon 2020-07-21  565   * @msg:       a message to emit if condition is false
eb5c2d4b45e3d2 Will Deacon 2020-07-21  566   *
eb5c2d4b45e3d2 Will Deacon 2020-07-21  567   * In tradition of POSIX assert, this macro will break the build if the
eb5c2d4b45e3d2 Will Deacon 2020-07-21  568   * supplied condition is *false*, emitting the supplied error message if the
eb5c2d4b45e3d2 Will Deacon 2020-07-21  569   * compiler has support to do so.
eb5c2d4b45e3d2 Will Deacon 2020-07-21  570   */
eb5c2d4b45e3d2 Will Deacon 2020-07-21  571  #define compiletime_assert(condition, msg) \
eb5c2d4b45e3d2 Will Deacon 2020-07-21 @572  	_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
eb5c2d4b45e3d2 Will Deacon 2020-07-21  573  

-- 
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https://github.com/intel/lkp-tests/wiki