x86/entry/syscalls: Move syscall table declarations into asm/syscalls.h

The header was missing some compat declarations.

Also make sys_call_ptr_t have a consistent type.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/3166aaff0fb43897998fcb6ef92991533f8c5c6c.1444091585.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/entry/syscall_32.c

@@ -4,13 +4,12 @@
 #include <linux/sys.h>
 #include <linux/cache.h>
 #include <asm/asm-offsets.h>
+#include <asm/syscall.h>
 
 #ifdef CONFIG_IA32_EMULATION
 #define SYM(sym, compat) compat
 #else
 #define SYM(sym, compat) sym
-#define ia32_sys_call_table sys_call_table
-#define __NR_syscall_compat_max __NR_syscall_max
 #endif
 
 #define __SYSCALL_I386(nr, sym, compat) extern asmlinkage void SYM(sym, compat)(void) ;
@@ -19,8 +18,6 @@
 
 #define __SYSCALL_I386(nr, sym, compat) [nr] = SYM(sym, compat),
 
-typedef asmlinkage void (*sys_call_ptr_t)(void);
-
 extern asmlinkage void sys_ni_syscall(void);
 
 __visible const sys_call_ptr_t ia32_sys_call_table[__NR_syscall_compat_max+1] = {

arch/x86/include/asm/syscall.h

@@ -20,9 +20,19 @@
 #include <asm/thread_info.h>	/* for TS_COMPAT */
 #include <asm/unistd.h>
 
-typedef void (*sys_call_ptr_t)(void);
+typedef asmlinkage void (*sys_call_ptr_t)(void);
 extern const sys_call_ptr_t sys_call_table[];
 
+#if defined(CONFIG_X86_32)
+#define ia32_sys_call_table sys_call_table
+#define __NR_syscall_compat_max __NR_syscall_max
+#define IA32_NR_syscalls NR_syscalls
+#endif
+
+#if defined(CONFIG_IA32_EMULATION)
+extern const sys_call_ptr_t ia32_sys_call_table[];
+#endif
+
 /*
  * Only the low 32 bits of orig_ax are meaningful, so we return int.
  * This importantly ignores the high bits on 64-bit, so comparisons

arch/x86/um/sys_call_table_32.c

@@ -7,6 +7,7 @@
 #include <linux/sys.h>
 #include <linux/cache.h>
 #include <generated/user_constants.h>
+#include <asm/syscall.h>
 
 #define __NO_STUBS
 
@@ -30,8 +31,6 @@
 #undef __SYSCALL_I386
 #define __SYSCALL_I386(nr, sym, compat) [ nr ] = sym,
 
-typedef asmlinkage void (*sys_call_ptr_t)(void);
-
 extern asmlinkage void sys_ni_syscall(void);
 
 const sys_call_ptr_t sys_call_table[] ____cacheline_aligned = {

arch/x86/um/sys_call_table_64.c

@@ -7,6 +7,7 @@
 #include <linux/sys.h>
 #include <linux/cache.h>
 #include <generated/user_constants.h>
+#include <asm/syscall.h>
 
 #define __NO_STUBS
 
@@ -43,8 +44,6 @@
 #undef __SYSCALL_64
 #define __SYSCALL_64(nr, sym, compat) [ nr ] = sym,
 
-typedef void (*sys_call_ptr_t)(void);
-
 extern void sys_ni_syscall(void);
 
 const sys_call_ptr_t sys_call_table[] ____cacheline_aligned = {