[RFC v2 PATCH 3/7] x86/syscall: unconditionally prototype {ia32,x32}_sys_call_table[]

From: H. Peter Anvin
Date: Mon May 10 2021 - 14:54:01 EST

From: "H. Peter Anvin (Intel)" <hpa@xxxxxxxxx>

Even if these APIs are disabled, and the arrays therefore do not
exist, having the prototypes allows us to use IS_ENABLED() rather than
using #ifdefs.

If something ends up trying to actually *use* these arrays a linker
error will ensue.

Signed-off-by: H. Peter Anvin (Intel) <hpa@xxxxxxxxx>
arch/x86/include/asm/syscall.h | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/arch/x86/include/asm/syscall.h b/arch/x86/include/asm/syscall.h
index 4e20054d7533..f6593cafdbd9 100644
--- a/arch/x86/include/asm/syscall.h
+++ b/arch/x86/include/asm/syscall.h
@@ -21,13 +21,12 @@ extern const sys_call_ptr_t sys_call_table[];

#if defined(CONFIG_X86_32)
#define ia32_sys_call_table sys_call_table
-#if defined(CONFIG_IA32_EMULATION)
+ * These may not exist, but still put the prototypes in so we
+ * can use IS_ENABLED().
+ */
extern const sys_call_ptr_t ia32_sys_call_table[];
-#ifdef CONFIG_X86_X32_ABI
extern const sys_call_ptr_t x32_sys_call_table[];