On Tue, 2018-05-29 at 16:06:41 UTC, Christophe Leroy wrote:

Latest GCC version emit the following warnings

As arch/powerpc code is built with -Werror, this breaks build with
GCC 8.1

This patch inhibits those warnings

  CC      arch/powerpc/kernel/syscalls.o
In file included from arch/powerpc/kernel/syscalls.c:24:
./include/linux/syscalls.h:233:18: error: 'sys_mmap2' alias between functions of incompatible types 'long int(long unsigned int,  size_t,  long unsigned int,  long unsigned int,  long unsigned int,  long unsigned int)' {aka 'long int(long unsigned int,  long unsigned int,  long unsigned int,  long unsigned int,  long unsigned int,  long unsigned int)'} and 'long int(long int,  long int,  long int,  long int,  long int,  long int)' [-Werror=attribute-alias]
  asmlinkage long sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \
                  ^~~
./include/linux/syscalls.h:222:2: 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_DEFINE6(name, ...) SYSCALL_DEFINEx(6, _##name, __VA_ARGS__)
                                    ^~~~~~~~~~~~~~~
arch/powerpc/kernel/syscalls.c:65:1: note: in expansion of macro 'SYSCALL_DEFINE6'
 SYSCALL_DEFINE6(mmap2, unsigned long, addr, size_t, len,
 ^~~~~~~~~~~~~~~
./include/linux/syscalls.h:238:18: note: aliased declaration here
  asmlinkage long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
                  ^~~~~~~~
./include/linux/syscalls.h:222:2: 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_DEFINE6(name, ...) SYSCALL_DEFINEx(6, _##name, __VA_ARGS__)
                                    ^~~~~~~~~~~~~~~
arch/powerpc/kernel/syscalls.c:65:1: note: in expansion of macro 'SYSCALL_DEFINE6'
 SYSCALL_DEFINE6(mmap2, unsigned long, addr, size_t, len,
 ^~~~~~~~~~~~~~~
./include/linux/syscalls.h:233:18: error: 'sys_mmap' alias between functions of incompatible types 'long int(long unsigned int,  size_t,  long unsigned int,  long unsigned int,  long unsigned int,  off_t)' {aka 'long int(long unsigned int,  long unsigned int,  long unsigned int,  long unsigned int,  long unsigned int,  long int)'} and 'long int(long int,  long int,  long int,  long int,  long int,  long int)' [-Werror=attribute-alias]
  asmlinkage long sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \
                  ^~~
./include/linux/syscalls.h:222:2: 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_DEFINE6(name, ...) SYSCALL_DEFINEx(6, _##name, __VA_ARGS__)
                                    ^~~~~~~~~~~~~~~
arch/powerpc/kernel/syscalls.c:72:1: note: in expansion of macro 'SYSCALL_DEFINE6'
 SYSCALL_DEFINE6(mmap, unsigned long, addr, size_t, len,
 ^~~~~~~~~~~~~~~
./include/linux/syscalls.h:238:18: note: aliased declaration here
  asmlinkage long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
                  ^~~~~~~~
./include/linux/syscalls.h:222:2: 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_DEFINE6(name, ...) SYSCALL_DEFINEx(6, _##name, __VA_ARGS__)
                                    ^~~~~~~~~~~~~~~
arch/powerpc/kernel/syscalls.c:72:1: note: in expansion of macro 'SYSCALL_DEFINE6'
 SYSCALL_DEFINE6(mmap, unsigned long, addr, size_t, len,
 ^~~~~~~~~~~~~~~
  CC      arch/powerpc/kernel/signal_32.o
In file included from arch/powerpc/kernel/signal_32.c:31:
./include/linux/compat.h:74:18: error: 'compat_sys_swapcontext' alias between functions of incompatible types 'long int(struct ucontext32 *, struct ucontext32 *, int)' and 'long int(long int,  long int,  long int)' [-Werror=attribute-alias]
  asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \
                  ^~~~~~~~~~
./include/linux/compat.h:58:2: note: in expansion of macro 'COMPAT_SYSCALL_DEFINEx'
  COMPAT_SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
  ^~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/kernel/signal_32.c:1041:1: note: in expansion of macro 'COMPAT_SYSCALL_DEFINE3'
 COMPAT_SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx,
 ^~~~~~~~~~~~~~~~~~~~~~
./include/linux/compat.h:79:18: note: aliased declaration here
  asmlinkage long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
                  ^~~~~~~~~~~~~~~
./include/linux/compat.h:58:2: note: in expansion of macro 'COMPAT_SYSCALL_DEFINEx'
  COMPAT_SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
  ^~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/kernel/signal_32.c:1041:1: note: in expansion of macro 'COMPAT_SYSCALL_DEFINE3'
 COMPAT_SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx,
 ^~~~~~~~~~~~~~~~~~~~~~
  CC      arch/powerpc/kernel/signal_64.o
In file included from arch/powerpc/kernel/signal_64.c:27:
./include/linux/syscalls.h:233:18: error: 'sys_swapcontext' alias between functions of incompatible types 'long int(struct ucontext *, struct ucontext *, long int)' and 'long int(long int,  long int,  long int)' [-Werror=attribute-alias]
  asmlinkage long sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \
                  ^~~
./include/linux/syscalls.h:222:2: note: in expansion of macro '__SYSCALL_DEFINEx'
  __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
  ^~~~~~~~~~~~~~~~~
./include/linux/syscalls.h:213:36: note: in expansion of macro 'SYSCALL_DEFINEx'
 #define SYSCALL_DEFINE3(name, ...) SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
                                    ^~~~~~~~~~~~~~~
arch/powerpc/kernel/signal_64.c:628:1: note: in expansion of macro 'SYSCALL_DEFINE3'
 SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx,
 ^~~~~~~~~~~~~~~
./include/linux/syscalls.h:238:18: note: aliased declaration here
  asmlinkage long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
                  ^~~~~~~~
./include/linux/syscalls.h:222:2: note: in expansion of macro '__SYSCALL_DEFINEx'
  __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
  ^~~~~~~~~~~~~~~~~
./include/linux/syscalls.h:213:36: note: in expansion of macro 'SYSCALL_DEFINEx'
 #define SYSCALL_DEFINE3(name, ...) SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
                                    ^~~~~~~~~~~~~~~
arch/powerpc/kernel/signal_64.c:628:1: note: in expansion of macro 'SYSCALL_DEFINE3'
 SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx,
 ^~~~~~~~~~~~~~~
  CC      arch/powerpc/kernel/rtas.o
In file included from arch/powerpc/kernel/rtas.c:29:
./include/linux/syscalls.h:233:18: error: 'sys_rtas' alias between functions of incompatible types 'long int(struct rtas_args *)' and 'long int(long int)' [-Werror=attribute-alias]
  asmlinkage long sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \
                  ^~~
./include/linux/syscalls.h:222:2: note: in expansion of macro '__SYSCALL_DEFINEx'
  __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
  ^~~~~~~~~~~~~~~~~
./include/linux/syscalls.h:211:36: note: in expansion of macro 'SYSCALL_DEFINEx'
 #define SYSCALL_DEFINE1(name, ...) SYSCALL_DEFINEx(1, _##name, __VA_ARGS__)
                                    ^~~~~~~~~~~~~~~
arch/powerpc/kernel/rtas.c:1054:1: note: in expansion of macro 'SYSCALL_DEFINE1'
 SYSCALL_DEFINE1(rtas, struct rtas_args __user *, uargs)
 ^~~~~~~~~~~~~~~
./include/linux/syscalls.h:238:18: note: aliased declaration here
  asmlinkage long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
                  ^~~~~~~~
./include/linux/syscalls.h:222:2: note: in expansion of macro '__SYSCALL_DEFINEx'
  __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
  ^~~~~~~~~~~~~~~~~
./include/linux/syscalls.h:211:36: note: in expansion of macro 'SYSCALL_DEFINEx'
 #define SYSCALL_DEFINE1(name, ...) SYSCALL_DEFINEx(1, _##name, __VA_ARGS__)
                                    ^~~~~~~~~~~~~~~
arch/powerpc/kernel/rtas.c:1054:1: note: in expansion of macro 'SYSCALL_DEFINE1'
 SYSCALL_DEFINE1(rtas, struct rtas_args __user *, uargs)
 ^~~~~~~~~~~~~~~
  CC      arch/powerpc/kernel/pci_64.o
In file included from arch/powerpc/kernel/pci_64.c:23:
./include/linux/syscalls.h:233:18: error: 'sys_pciconfig_iobase' alias between functions of incompatible types 'long int(long int,  long unsigned int,  long unsigned int)' and 'long int(long int,  long int,  long int)' [-Werror=attribute-alias]
  asmlinkage long sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \
                  ^~~
./include/linux/syscalls.h:222:2: note: in expansion of macro '__SYSCALL_DEFINEx'
  __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
  ^~~~~~~~~~~~~~~~~
./include/linux/syscalls.h:213:36: note: in expansion of macro 'SYSCALL_DEFINEx'
 #define SYSCALL_DEFINE3(name, ...) SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
                                    ^~~~~~~~~~~~~~~
arch/powerpc/kernel/pci_64.c:206:1: note: in expansion of macro 'SYSCALL_DEFINE3'
 SYSCALL_DEFINE3(pciconfig_iobase, long, which, unsigned long, in_bus,
 ^~~~~~~~~~~~~~~
./include/linux/syscalls.h:238:18: note: aliased declaration here
  asmlinkage long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
                  ^~~~~~~~
./include/linux/syscalls.h:222:2: note: in expansion of macro '__SYSCALL_DEFINEx'
  __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
  ^~~~~~~~~~~~~~~~~
./include/linux/syscalls.h:213:36: note: in expansion of macro 'SYSCALL_DEFINEx'
 #define SYSCALL_DEFINE3(name, ...) SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
                                    ^~~~~~~~~~~~~~~
arch/powerpc/kernel/pci_64.c:206:1: note: in expansion of macro 'SYSCALL_DEFINE3'
 SYSCALL_DEFINE3(pciconfig_iobase, long, which, unsigned long, in_bus,
 ^~~~~~~~~~~~~~~

Signed-off-by: Christophe Leroy <redacted>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/2479bfc9bc600dcce7f932d52dcfa8

cheers