[kbuild-all] Re: drivers/infiniband/hw/qib/qib_sysfs.c:413:1: error: static_assert expression is not an integral constant expression

On Sat, Sep 11, 2021 at 08:17:08PM +0800, kernel test robot wrote: > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master > head: 926de8c4326c14fcf35f1de142019043597a4fac > commit: 84f969e1c48ed3825986e91a0786e363d57f69d1 IB/qib: Fix null pointer subtraction compiler warning > date: 3 days ago > config: x86_64-randconfig-a014-20210911 (attached as .config) > compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 261cbe98c38f8c1ee1a482fe76511110e790f58a) > 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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... > git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git > git fetch --no-tags linus master > git checkout 84f969e1c48ed3825986e91a0786e363d57f69d1 > # save the attached .config to linux build tree > mkdir build_dir > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross O=build_dir ARCH=x86_64 SHELL=/bin/bash > > If you fix the issue, kindly add following tag as appropriate > Reported-by: kernel test robot <lkp(a)intel.com&gt; > > All errors (new ones prefixed by >>): > > >> drivers/infiniband/hw/qib/qib_sysfs.c:413:1: error: static_assert expression is not an integral constant expression > QIB_DIAGC_ATTR(rc_resends); > ^~~~~~~~~~~~~~~~~~~~~~~~~~ > drivers/infiniband/hw/qib/qib_sysfs.c:406:16: note: expanded from macro 'QIB_DIAGC_ATTR' > static_assert(&((struct qib_ibport *)0)->rvp.n_##N != (u64 *)NULL); \ > ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > include/linux/build_bug.h:77:50: note: expanded from macro 'static_assert' > #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr) > ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~ > include/linux/build_bug.h:78:56: note: expanded from macro '__static_assert' > #define __static_assert(expr, msg, ...) _Static_assert(expr, msg) > ^~~~ > drivers/infiniband/hw/qib/qib_sysfs.c:413:1: note: cannot access field of null pointer > drivers/infiniband/hw/qib/qib_sysfs.c:406:43: note: expanded from macro 'QIB_DIAGC_ATTR' > static_assert(&((struct qib_ibport *)0)->rvp.n_##N != (u64 *)NULL); \ > ^ > drivers/infiniband/hw/qib/qib_sysfs.c:414:1: error: static_assert expression is not an integral constant expression > QIB_DIAGC_ATTR(seq_naks); > ^~~~~~~~~~~~~~~~~~~~~~~~ Nick/Nathan Clang is being a real PITA here - do you know of a solution?

This macro would like to know that the passed in member name has a u64 type, all the things I've come up with fail on clang - but many work fine on gcc. Frankly I think this case is a clang bug myself..