From: H. Peter Anvin (Intel) <hpa@zytor.com>
Date: Mon, 10 May 2021 18:53:12 +0000 (-0700)
Subject: x86/syscall: Unconditionally prototype {ia32,x32}_sys_call_table[]
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=dce0aa3b2ef28900cc4c779c59a870f1b4bdadee;p=linux.git

x86/syscall: Unconditionally prototype {ia32,x32}_sys_call_table[]

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@zytor.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210510185316.3307264-4-hpa@zytor.com
---

diff --git a/arch/x86/include/asm/syscall.h b/arch/x86/include/asm/syscall.h
index 4e20054d7533e..f6593cafdbd93 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
-#endif
-
-#if defined(CONFIG_IA32_EMULATION)
+#else
+/*
+ * 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[];
-#endif
-
-#ifdef CONFIG_X86_X32_ABI
 extern const sys_call_ptr_t x32_sys_call_table[];
 #endif