linux-kernel - [ammarfaizi2-block:paulmck/linux-rcu/lazy.2022.09.03b 38/40] include/net/dst.h:230:2: error: call to __compiletime_assert_401 declared with 'error' attribute: BUILD_BUG_ON failed: offsetof(struct dst_entry, _

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Date:   Mon, 5 Sep 2022 11:09:55 +0800
From:   kernel test robot <lkp@...el.com>
To:     "Joel Fernandes (Google)" <joel@...lfernandes.org>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        Ammar Faizi <ammarfaizi2@...weeb.org>,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
        linux-kernel@...r.kernel.org,
        "Paul E. McKenney" <paulmck@...nel.org>
Subject: [ammarfaizi2-block:paulmck/linux-rcu/lazy.2022.09.03b 38/40]
 include/net/dst.h:230:2: error: call to __compiletime_assert_401 declared
 with 'error' attribute: BUILD_BUG_ON failed: offsetof(struct dst_entry,
 __refcnt) & 63

tree:   https://github.com/ammarfaizi2/linux-block paulmck/linux-rcu/lazy.2022.09.03b
head:   485ca0ab99b3e10ff521fff226c3c8fe48fad488
commit: c944944108dcac62942ab154ce09e96afcd190c5 [38/40] rcu: Add per-CB tracing for queuing, flush and invocation.
config: powerpc-allmodconfig (https://download.01.org/0day-ci/archive/20220905/202209051011.pAmcAnkK-lkp@intel.com/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project c55b41d5199d2394dd6cdb8f52180d8b81d809d4)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install powerpc cross compiling tool for clang build
        # apt-get install binutils-powerpc-linux-gnu
        # https://github.com/ammarfaizi2/linux-block/commit/c944944108dcac62942ab154ce09e96afcd190c5
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block paulmck/linux-rcu/lazy.2022.09.03b
        git checkout c944944108dcac62942ab154ce09e96afcd190c5
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash net/sched/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   In file included from net/sched/act_tunnel_key.c:12:
   In file included from include/net/geneve.h:5:
   In file included from include/net/udp_tunnel.h:5:
   In file included from include/net/ip_tunnels.h:13:
   In file included from include/net/dsfield.h:12:
   In file included from include/linux/ipv6.h:93:
   In file included from include/linux/tcp.h:19:
   In file included from include/net/sock.h:66:
>> include/net/dst.h:230:2: error: call to __compiletime_assert_401 declared with 'error' attribute: BUILD_BUG_ON failed: offsetof(struct dst_entry, __refcnt) & 63
           BUILD_BUG_ON(offsetof(struct dst_entry, __refcnt) & 63);
           ^
   include/linux/build_bug.h:50:2: note: expanded from macro 'BUILD_BUG_ON'
           BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
           ^
   include/linux/build_bug.h:39:37: note: expanded from macro 'BUILD_BUG_ON_MSG'
   #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
                                       ^
   include/linux/compiler_types.h:354:2: note: expanded from macro 'compiletime_assert'
           _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
           ^
   include/linux/compiler_types.h:342:2: note: expanded from macro '_compiletime_assert'
           __compiletime_assert(condition, msg, prefix, suffix)
           ^
   include/linux/compiler_types.h:335:4: note: expanded from macro '__compiletime_assert'
                           prefix ## suffix();                             \
                           ^
   <scratch space>:218:1: note: expanded from here
   __compiletime_assert_401
   ^
   1 error generated.


vim +/error +230 include/net/dst.h

^1da177e4c3f41 Linus Torvalds 2005-04-16  223  
^1da177e4c3f41 Linus Torvalds 2005-04-16  224  static inline void dst_hold(struct dst_entry *dst)
^1da177e4c3f41 Linus Torvalds 2005-04-16  225  {
5635c10d976716 Eric Dumazet   2008-11-16  226  	/*
5635c10d976716 Eric Dumazet   2008-11-16  227  	 * If your kernel compilation stops here, please check
8b207e7374c244 David Miller   2017-11-28  228  	 * the placement of __refcnt in struct dst_entry
5635c10d976716 Eric Dumazet   2008-11-16  229  	 */
5635c10d976716 Eric Dumazet   2008-11-16 @230  	BUILD_BUG_ON(offsetof(struct dst_entry, __refcnt) & 63);
44ebe79149ff41 Wei Wang       2017-06-17  231  	WARN_ON(atomic_inc_not_zero(&dst->__refcnt) == 0);
^1da177e4c3f41 Linus Torvalds 2005-04-16  232  }
^1da177e4c3f41 Linus Torvalds 2005-04-16  233  

:::::: The code at line 230 was first introduced by commit
:::::: 5635c10d976716ef47ae441998aeae144c7e7387 net: make sure struct dst_entry refcount is aligned on 64 bytes

:::::: TO: Eric Dumazet <dada1@...mosbay.com>
:::::: CC: David S. Miller <davem@...emloft.net>

-- 
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https://01.org/lkp