UAPI: Fix the guards on various asm/unistd.h files

asm-generic/unistd.h and a number of asm/unistd.h files have been given
reinclusion guards that allow the guard to be overridden if __SYSCALL is
defined.  Unfortunately, these files define __SYSCALL and don't undefine it
when they've finished with it, thus rendering the guard ineffective.

The reason for this override is to allow the file to be #included multiple
times with different settings on __SYSCALL for purposes like generating syscall
tables.

The following guards are problematic:

arch/arm64/include/asm/unistd.h:#if !defined(__ASM_UNISTD_H) || defined(__SYSCALL)
arch/arm64/include/asm/unistd32.h:#if !defined(__ASM_UNISTD32_H) || defined(__SYSCALL)
arch/c6x/include/asm/unistd.h:#if !defined(_ASM_C6X_UNISTD_H) || defined(__SYSCALL)
arch/hexagon/include/asm/unistd.h:#if !defined(_ASM_HEXAGON_UNISTD_H) || defined(__SYSCALL)
arch/openrisc/include/asm/unistd.h:#if !defined(__ASM_OPENRISC_UNISTD_H) || defined(__SYSCALL)
arch/score/include/asm/unistd.h:#if !defined(_ASM_SCORE_UNISTD_H) || defined(__SYSCALL)
arch/tile/include/asm/unistd.h:#if !defined(_ASM_TILE_UNISTD_H) || defined(__SYSCALL)
arch/unicore32/include/asm/unistd.h:#if !defined(__UNICORE_UNISTD_H__) || defined(__SYSCALL)
include/asm-generic/unistd.h:#if !defined(_ASM_GENERIC_UNISTD_H) || defined(__SYSCALL)

On the assumption that the guards' ineffectiveness has passed unnoticed, just
remove these guards entirely.
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>

arch/arm64/include/asm/unistd.h

@@ -13,8 +13,6 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
-#if !defined(__ASM_UNISTD_H) || defined(__SYSCALL)
-#define __ASM_UNISTD_H
 
 #ifndef __SYSCALL_COMPAT
 #include <asm-generic/unistd.h>
@@ -23,5 +21,3 @@
 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 #include <asm/unistd32.h>
 #endif
-
-#endif /* __ASM_UNISTD_H */

arch/arm64/include/asm/unistd32.h

@@ -16,8 +16,6 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
-#if !defined(__ASM_UNISTD32_H) || defined(__SYSCALL)
-#define __ASM_UNISTD32_H
 
 #ifndef __SYSCALL
 #define __SYSCALL(x, y)
@@ -754,5 +752,3 @@ __SYSCALL(__NR_syncfs, sys_syncfs)
 #define __ARCH_WANT_SYS_SIGPENDING
 #define __ARCH_WANT_SYS_SIGPROCMASK
 #define __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
-
-#endif /* __ASM_UNISTD32_H */

arch/c6x/include/asm/unistd.h

@@ -13,8 +13,6 @@
  *   NON INFRINGEMENT.	See the GNU General Public License for
  *   more details.
  */
-#if !defined(_ASM_C6X_UNISTD_H) || defined(__SYSCALL)
-#define _ASM_C6X_UNISTD_H
 
 /* Use the standard ABI for syscalls. */
 #include <asm-generic/unistd.h>
@@ -22,5 +20,3 @@
 /* C6X-specific syscalls. */
 #define __NR_cache_sync	(__NR_arch_specific_syscall + 0)
 __SYSCALL(__NR_cache_sync, sys_cache_sync)
-
-#endif /* _ASM_C6X_UNISTD_H */

arch/hexagon/include/asm/unistd.h

@@ -18,9 +18,6 @@
  * 02110-1301, USA.
  */
 
-#if !defined(_ASM_HEXAGON_UNISTD_H) || defined(__SYSCALL)
-#define _ASM_HEXAGON_UNISTD_H
-
 /*
  *  The kernel pulls this unistd.h in three different ways:
  *  1.  the "normal" way which gets all the __NR defines
@@ -32,5 +29,3 @@
 #define sys_mmap2 sys_mmap_pgoff
 
 #include <asm-generic/unistd.h>
-
-#endif

arch/openrisc/include/asm/unistd.h

@@ -16,9 +16,6 @@
  * (at your option) any later version.
  */
 
-#if !defined(__ASM_OPENRISC_UNISTD_H) || defined(__SYSCALL)
-#define __ASM_OPENRISC_UNISTD_H
-
 #define __ARCH_HAVE_MMU
 
 #define sys_mmap2 sys_mmap_pgoff
@@ -27,5 +24,3 @@
 
 #define __NR_or1k_atomic __NR_arch_specific_syscall
 __SYSCALL(__NR_or1k_atomic, sys_or1k_atomic)
-
-#endif /* __ASM_OPENRISC_UNISTD_H */

arch/score/include/asm/unistd.h

-#if !defined(_ASM_SCORE_UNISTD_H) || defined(__SYSCALL)
-#define _ASM_SCORE_UNISTD_H
-
 #define __ARCH_HAVE_MMU
 
 #define __ARCH_WANT_SYSCALL_NO_AT
@@ -9,5 +6,3 @@
 #define __ARCH_WANT_SYSCALL_DEPRECATED
 
 #include <asm-generic/unistd.h>
-
-#endif /* _ASM_SCORE_UNISTD_H */

arch/tile/include/asm/unistd.h

@@ -12,9 +12,6 @@
  *   more details.
  */
 
-#if !defined(_ASM_TILE_UNISTD_H) || defined(__SYSCALL)
-#define _ASM_TILE_UNISTD_H
-
 #if !defined(__LP64__) || defined(__SYSCALL_COMPAT)
 /* Use the flavor of this syscall that matches the 32-bit API better. */
 #define __ARCH_WANT_SYNC_FILE_RANGE2
@@ -43,5 +40,3 @@ __SYSCALL(__NR_cmpxchg_badaddr, sys_cmpxchg_badaddr)
 #endif
 #define __ARCH_WANT_SYS_NEWFSTATAT
 #endif
-
-#endif /* _ASM_TILE_UNISTD_H */

arch/unicore32/include/asm/unistd.h

@@ -9,10 +9,6 @@
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
-#if !defined(__UNICORE_UNISTD_H__) || defined(__SYSCALL)
-#define __UNICORE_UNISTD_H__
 
 /* Use the standard ABI for syscalls. */
 #include <asm-generic/unistd.h>
-
-#endif /* __UNICORE_UNISTD_H__ */

include/asm-generic/unistd.h

-#if !defined(_ASM_GENERIC_UNISTD_H) || defined(__SYSCALL)
-#define _ASM_GENERIC_UNISTD_H
-
 #include <asm/bitsperlong.h>
 
 /*
@@ -930,4 +927,3 @@ __SYSCALL(__NR_fork, sys_ni_syscall)
 #endif
 
 #endif /* __KERNEL__ */
-#endif /* _ASM_GENERIC_UNISTD_H */