Re: [ammarfaizi2-block:akpm/mm/mm-unstable 46/244] lib/test_maple_tree.c:453:12: warning: result of comparison of constant 4398046511104 with expression of type 'unsigned long' is always false

[Andrew Morton <akpm@linux-foundation.org>]

On Sun, 30 Oct 2022 13:04:16 +0800 kernel test robot <lkp@intel.com> wrote:

> tree:   https://github.com/ammarfaizi2/linux-block akpm/mm/mm-unstable
> head:   eecc1f68b7ae1e677dd01b728e58de61a2f8ae71
> commit: d9c0ca7c6a02830de65fbc684cf0be7e6510737c [46/244] maple_tree: reorganize testing to restore module testing
> config: hexagon-allmodconfig
> compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 791a7ae1ba3efd6bca96338e10ffde557ba83920)
> 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
>         # https://github.com/ammarfaizi2/linux-block/commit/d9c0ca7c6a02830de65fbc684cf0be7e6510737c
>         git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
>         git fetch --no-tags ammarfaizi2-block akpm/mm/mm-unstable
>         git checkout d9c0ca7c6a02830de65fbc684cf0be7e6510737c
>         # 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=hexagon SHELL=/bin/bash lib/
> 
> If you fix the issue, kindly add following tag where applicable
> | Reported-by: kernel test robot <lkp@intel.com>
> 
> All warnings (new ones prefixed by >>):
> 
> >> lib/test_maple_tree.c:453:12: warning: result of comparison of constant 4398046511104 with expression of type 'unsigned long' is always false [-Wtautological-constant-out-of-range-compare]
>                    if ((val == 4398046511104) || (val == ULONG_MAX))
>                         ~~~ ^  ~~~~~~~~~~~~~
>    lib/test_maple_tree.c:496:17: warning: result of comparison of constant 4398046511104 with expression of type 'unsigned long' is always false [-Wtautological-constant-out-of-range-compare]
>                    else if ((val == 4398046511104) || (val == ULONG_MAX))
>                              ~~~ ^  ~~~~~~~~~~~~~
>    lib/test_maple_tree.c:182:19: warning: unused function 'not_empty' [-Wunused-function]
>    static inline int not_empty(struct maple_node *node)

Thanks.  A 32-bit build, I assume.

Liam, what's with that 4398046511104?  Wouldn't 0x40000000000 be clearer?