Re: [PATCH v9 2/4] seccomp: switch system call argument type to void *

On Tue, Dec 04, 2018 at 10:07:38AM +0800, kbuild test robot wrote:

Hi Tycho,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.20-rc5 next-20181203]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Tycho-Andersen/seccomp-hoist-struct-seccomp_data-recalculation-higher/20181204-013450
config: i386-randconfig-x005-201848 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   In file included from kernel/seccomp.c:28:0:

quoted

quoted

include/linux/syscalls.h:239:18: error: conflicting types for 'sys_seccomp'

     asmlinkage long sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \
                     ^
   include/linux/syscalls.h:225:2: note: in expansion of macro '__SYSCALL_DEFINEx'
     __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
     ^~~~~~~~~~~~~~~~~
   include/linux/syscalls.h:216:36: note: in expansion of macro 'SYSCALL_DEFINEx'
    #define SYSCALL_DEFINE3(name, ...) SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
                                       ^~~~~~~~~~~~~~~
   kernel/seccomp.c:946:1: note: in expansion of macro 'SYSCALL_DEFINE3'
    SYSCALL_DEFINE3(seccomp, unsigned int, op, unsigned int, flags,
    ^~~~~~~~~~~~~~~
   In file included from kernel/seccomp.c:28:0:
   include/linux/syscalls.h:881:17: note: previous declaration of 'sys_seccomp' was here
    asmlinkage long sys_seccomp(unsigned int op, unsigned int flags,
                    ^~~~~~~~~~~

Huh, I have no idea why I don't see this, but even with the attached
config it still doesn't cause a problem for me. Anyway, I'll fix it up
and do some more investigating...

Tycho