warnings.

$ make W=1 kernel/sys_ni.o
   [ snip ]
   CC      kernel/sys_ni.o
In file included from kernel/sys_ni.c:10:
./arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_io_setup' [-Wmissing-prototypes]
    83 |  __weak long __##abi##_##name(const struct pt_regs *__unused) \
       |              ^~
./arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
   100 |  __COND_SYSCALL(x64, sys_##name)
       |  ^~~~~~~~~~~~~~
./arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
   256 |  __X64_COND_SYSCALL(name)     \
       |  ^~~~~~~~~~~~~~~~~~
kernel/sys_ni.c:39:1: note: in expansion of macro 'COND_SYSCALL'
    39 | COND_SYSCALL(io_setup);
       | ^~~~~~~~~~~~
./arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__ia32_sys_io_setup' [-Wmissing-prototypes]
    83 |  __weak long __##abi##_##name(const struct pt_regs *__unused) \
       |              ^~
./arch/x86/include/asm/syscall_wrapper.h:120:2: note: in expansion of macro '__COND_SYSCALL'
   120 |  __COND_SYSCALL(ia32, sys_##name)
       |  ^~~~~~~~~~~~~~
./arch/x86/include/asm/syscall_wrapper.h:257:2: note: in expansion of macro '__IA32_COND_SYSCALL'
   257 |  __IA32_COND_SYSCALL(name)
       |  ^~~~~~~~~~~~~~~~~~~
kernel/sys_ni.c:39:1: note: in expansion of macro 'COND_SYSCALL'
    39 | COND_SYSCALL(io_setup);
       | ^~~~~~~~~~~~
   ...

__SYS_STUB0() and __SYS_STUBx() defined a few lines above have forward
declarations. Let's do likewise for __COND_SYSCALL() to fix the
warnings.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---

  arch/x86/include/asm/syscall_wrapper.h | 1 +
  1 file changed, 1 insertion(+)

diff --git a/arch/x86/include/asm/syscall_wrapper.h b/arch/x86/include/asm/syscall_wrapper.h
index a84333adeef2..80c08c7d5e72 100644
--- a/arch/x86/include/asm/syscall_wrapper.h
+++ b/arch/x86/include/asm/syscall_wrapper.h

@@ -80,6 +80,7 @@ extern long __ia32_sys_ni_syscall(const struct pt_regs *regs);
  	}
  
  #define __COND_SYSCALL(abi, name)					\
+	__weak long __##abi##_##name(const struct pt_regs *__unused);	\
  	__weak long __##abi##_##name(const struct pt_regs *__unused)	\