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    • Greg Kroah-Hartman's avatar
      Linux 4.14.59 · 53208e12
      Greg Kroah-Hartman authored
      53208e12
    • Arnd Bergmann's avatar
      turn off -Wattribute-alias · e94f784f
      Arnd Bergmann authored
      Starting with gcc-8.1, we get a warning about all system call definitions,
      which use an alias between functions with incompatible prototypes, e.g.:
      
      In file included from ../mm/process_vm_access.c:19:
      ../include/linux/syscalls.h:211:18: warning: 'sys_process_vm_readv' alias between functions of incompatible types 'long int(pid_t,  const struct iovec *, long unsigned int,  const struct iovec *, long unsigned int,  long unsigned int)' {aka 'long int(int,  const struct iovec *, long unsigned int,  const struct iovec *, long unsigned int,  long unsigned int)'} and 'long int(long int,  long int,  long int,  long int,  long int,  long int)' [-Wattribute-alias]
        asmlinkage long sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \
                        ^~~
      ../include/linux/syscalls.h:207:2: note: in expansion of macro '__SYSCALL_DEFINEx'
        __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
        ^~~~~~~~~~~~~~~~~
      ../include/linux/syscalls.h:201:36: note: in expansion of macro 'SYSCALL_DEFINEx'
       #define SYSCALL_DEFINE6(name, ...) SYSCALL_DEFINEx(6, _##name, __VA_ARGS__)
                                          ^~~~~~~~~~~~~~~
      ../mm/process_vm_access.c:300:1: note: in expansion of macro 'SYSCALL_DEFINE6'
       SYSCALL_DEFINE6(process_vm_readv, pid_t, pid, const struct iovec __user *, lvec,
       ^~~~~~~~~~~~~~~
      ../include/linux/syscalls.h:215:18: note: aliased declaration here
        asmlinkage long SyS##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
                        ^~~
      ../include/linux/syscalls.h:207:2: note: in expansion of macro '__SYSCALL_DEFINEx'
        __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
        ^~~~~~~~~~~~~~~~~
      ../include/linux/syscalls.h:201:36: note: in expansion of macro 'SYSCALL_DEFINEx'
       #define SYSCALL_DEFINE6(name, ...) SYSCALL_DEFINEx(6, _##name, __VA_ARGS__)
                                          ^~~~~~~~~~~~~~~
      ../mm/process_vm_access.c:300:1: note: in expansion of macro 'SYSCALL_DEFINE6'
       SYSCALL_DEFINE6(process_vm_readv, pid_t, pid, const struct iovec __user *, lvec,
      
      This is really noisy and does not indicate a real problem. In the latest
      mainline kernel, this was addressed by commit bee20031772a ("disable
      -Wattribute-alias warning for SYSCALL_DEFINEx()"), which seems too invasive
      to backport.
      
      This takes a much simpler approach and just disables the warning across the
      kernel.
      Signed-off-by: 's avatarArnd Bergmann <arnd@arndb.de>
      Signed-off-by: 's avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      e94f784f
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