[kkdwivedi:xdp-tcp 28/41] include/linux/compiler_types.h:702:38: error: call to '__compiletime_assert_858' declared with attribute error: min(len, pfrag->size - pfrag->offset) signedness error

[kkdwivedi:xdp-tcp 28/41] include/linux/compiler_types.h:702:38: error: call to '__compiletime_assert_858' declared with attribute error: min(len, pfrag->size - pfrag->offset) signedness error

[kernel test robot]

tree:   https://github.com/kkdwivedi/linux xdp-tcp
head:   98ba2e45e6a3e93f19f6579031bd9e6995b9ca4c
commit: b7c41d3f731d7d54b9989b4c6f765c26635e7e50 [28/41] tcp: Put the payload of XDP responses in page fragments
config: arm-randconfig-r2200-20261006 (https://download.01.org/0day-ci/archive/20261006/202610061807.IZHYfydD-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 8.5.0
smatch: v0.5.0-9187-g5189e3fb
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261006/202610061807.IZHYfydD-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202610061807.IZHYfydD-lkp@intel.com/

All errors (new ones prefixed by >>):

   net/ipv4/tcp_xdp.c: In function 'bpf_xdp_tcp_consume':
   net/ipv4/tcp_xdp.c:262:11: warning: assignment to 'sk_buff_data_t' {aka 'unsigned char *'} from 'unsigned int' makes pointer from integer without a cast [-Wint-conversion]
     skb->end = offsetof(typeof(fake), shinfo) - offsetof(typeof(fake), hdr);
              ^
   net/ipv4/tcp_xdp.c:263:12: warning: assignment to 'sk_buff_data_t' {aka 'unsigned char *'} from 'u32' {aka 'unsigned int'} makes pointer from integer without a cast [-Wint-conversion]
     skb->tail = hlen;
               ^
   In file included from <command-line>:
   In function 'xdp_tcp_alloc_segment',
       inlined from 'bpf_xdp_tcp_send' at net/ipv4/tcp_xdp.c:416:8:
>> include/linux/compiler_types.h:702:38: error: call to '__compiletime_assert_858' declared with attribute error: min(len, pfrag->size - pfrag->offset) signedness error
     _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
                                         ^
   include/linux/compiler_types.h:683:4: note: in definition of macro '__compiletime_assert'
       prefix ## suffix();    \
       ^~~~~~
   include/linux/compiler_types.h:702:2: note: in expansion of macro '_compiletime_assert'
     _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
     ^~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:40:37: note: in expansion of macro 'compiletime_assert'
    #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
                                        ^~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:93:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
     BUILD_BUG_ON_MSG(!__types_ok(ux, uy),  \
     ^~~~~~~~~~~~~~~~
   include/linux/minmax.h:98:2: note: in expansion of macro '__careful_cmp_once'
     __careful_cmp_once(op, x, y, __UNIQUE_ID(x_), __UNIQUE_ID(y_))
     ^~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:105:19: note: in expansion of macro '__careful_cmp'
    #define min(x, y) __careful_cmp(min, x, y)
                      ^~~~~~~~~~~~~
   net/ipv4/tcp_xdp.c:354:10: note: in expansion of macro 'min'
      copy = min(len, pfrag->size - pfrag->offset);
             ^~~


vim +/__compiletime_assert_858 +702 include/linux/compiler_types.h

eb5c2d4b45e3d2 Will Deacon 2020-07-21  688  
eb5c2d4b45e3d2 Will Deacon 2020-07-21  689  #define _compiletime_assert(condition, msg, prefix, suffix) \
eb5c2d4b45e3d2 Will Deacon 2020-07-21  690  	__compiletime_assert(condition, msg, prefix, suffix)
eb5c2d4b45e3d2 Will Deacon 2020-07-21  691  
eb5c2d4b45e3d2 Will Deacon 2020-07-21  692  /**
eb5c2d4b45e3d2 Will Deacon 2020-07-21  693   * compiletime_assert - break build and emit msg if condition is false
eb5c2d4b45e3d2 Will Deacon 2020-07-21  694   * @condition: a compile-time constant condition to check
eb5c2d4b45e3d2 Will Deacon 2020-07-21  695   * @msg:       a message to emit if condition is false
eb5c2d4b45e3d2 Will Deacon 2020-07-21  696   *
eb5c2d4b45e3d2 Will Deacon 2020-07-21  697   * In tradition of POSIX assert, this macro will break the build if the
eb5c2d4b45e3d2 Will Deacon 2020-07-21  698   * supplied condition is *false*, emitting the supplied error message if the
eb5c2d4b45e3d2 Will Deacon 2020-07-21  699   * compiler has support to do so.
eb5c2d4b45e3d2 Will Deacon 2020-07-21  700   */
eb5c2d4b45e3d2 Will Deacon 2020-07-21  701  #define compiletime_assert(condition, msg) \
eb5c2d4b45e3d2 Will Deacon 2020-07-21 @702  	_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
eb5c2d4b45e3d2 Will Deacon 2020-07-21  703  

:::::: The code at line 702 was first introduced by commit
:::::: eb5c2d4b45e3d2d5d052ea6b8f1463976b1020d5 compiler.h: Move compiletime_assert() macros into compiler_types.h

:::::: TO: Will Deacon <will@kernel.org>
:::::: CC: Will Deacon <will@kernel.org>

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