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Subject[PATCH] powerpc/cell: fix build failure by disabling attribute-alias warning
Date
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/platforms/cell/spu_syscalls.o
In file included from arch/powerpc/platforms/cell/spu_syscalls.c:26:
./include/linux/syscalls.h:233:18: error: 'sys_spu_create' alias between functions of incompatible types 'long int(const char *, unsigned int, umode_t, int)' {aka 'long int(const char *, unsigned int, short unsigned int, int)'} and '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:214:36: note: in expansion of macro 'SYSCALL_DEFINEx'
#define SYSCALL_DEFINE4(name, ...) SYSCALL_DEFINEx(4, _##name, __VA_ARGS__)
^~~~~~~~~~~~~~~
arch/powerpc/platforms/cell/spu_syscalls.c:70:1: note: in expansion of macro 'SYSCALL_DEFINE4'
SYSCALL_DEFINE4(spu_create, const char __user *, name, unsigned int, flags,
^~~~~~~~~~~~~~~
./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:214:36: note: in expansion of macro 'SYSCALL_DEFINEx'
#define SYSCALL_DEFINE4(name, ...) SYSCALL_DEFINEx(4, _##name, __VA_ARGS__)
^~~~~~~~~~~~~~~
arch/powerpc/platforms/cell/spu_syscalls.c:70:1: note: in expansion of macro 'SYSCALL_DEFINE4'
SYSCALL_DEFINE4(spu_create, const char __user *, name, unsigned int, flags,
^~~~~~~~~~~~~~~
./include/linux/syscalls.h:233:18: error: 'sys_spu_run' alias between functions of incompatible types 'long int(int, __u32 *, __u32 *)' {aka 'long int(int, unsigned int *, 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/platforms/cell/spu_syscalls.c:94:1: note: in expansion of macro 'SYSCALL_DEFINE3'
SYSCALL_DEFINE3(spu_run,int, fd, __u32 __user *, unpc, __u32 __user *, ustatus)
^~~~~~~~~~~~~~~
./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/platforms/cell/spu_syscalls.c:94:1: note: in expansion of macro 'SYSCALL_DEFINE3'
SYSCALL_DEFINE3(spu_run,int, fd, __u32 __user *, unpc, __u32 __user *, ustatus)
^~~~~~~~~~~~~~~

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/platforms/cell/spu_syscalls.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/arch/powerpc/platforms/cell/spu_syscalls.c b/arch/powerpc/platforms/cell/spu_syscalls.c
index 263413a34823..9afc91dfbdcd 100644
--- a/arch/powerpc/platforms/cell/spu_syscalls.c
+++ b/arch/powerpc/platforms/cell/spu_syscalls.c
@@ -67,6 +67,8 @@ static inline void spufs_calls_put(struct spufs_calls *calls) { }

#endif /* CONFIG_SPU_FS_MODULE */

+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wattribute-alias"
SYSCALL_DEFINE4(spu_create, const char __user *, name, unsigned int, flags,
umode_t, mode, int, neighbor_fd)
{
@@ -111,6 +113,7 @@ SYSCALL_DEFINE3(spu_run,int, fd, __u32 __user *, unpc, __u32 __user *, ustatus)
spufs_calls_put(calls);
return ret;
}
+#pragma GCC diagnostic pop

#ifdef CONFIG_COREDUMP
int elf_coredump_extra_notes_size(void)
--
2.13.3
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