[tip: x86/urgent] x86/entry/32: Fix XEN_PV build dependency

[tip-bot2 for Ingo Molnar]

The following commit has been merged into the x86/urgent branch of tip:

Commit-ID:     a4c0e91d1d65bc58f928b80ed824e10e165da22c
Gitweb:        https://git.kernel.org/tip/a4c0e91d1d65bc58f928b80ed824e10e165da22c
Author:        Ingo Molnar <mingo@xxxxxxxxxx>
AuthorDate:    Sun, 05 Jul 2020 21:33:11 +02:00
Committer:     Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Sun, 05 Jul 2020 21:39:23 +02:00

x86/entry/32: Fix XEN_PV build dependency

xenpv_exc_nmi() and xenpv_exc_debug() are only defined on 64-bit kernels,
but they snuck into the 32-bit build via <asm/identry.h>, causing the link
to fail:

  ld: arch/x86/entry/entry_32.o: in function `asm_xenpv_exc_nmi':
  (.entry.text+0x817): undefined reference to `xenpv_exc_nmi'

  ld: arch/x86/entry/entry_32.o: in function `asm_xenpv_exc_debug':
  (.entry.text+0x827): undefined reference to `xenpv_exc_debug'

Only use them on 64-bit kernels.

Fixes: f41f0824224e: ("x86/entry/xen: Route #DB correctly on Xen PV")
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 arch/x86/include/asm/idtentry.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h
index eeac6dc..f3d7083 100644
--- a/arch/x86/include/asm/idtentry.h
+++ b/arch/x86/include/asm/idtentry.h
@@ -553,7 +553,7 @@ DECLARE_IDTENTRY_RAW(X86_TRAP_MC,	exc_machine_check);
 
 /* NMI */
 DECLARE_IDTENTRY_NMI(X86_TRAP_NMI,	exc_nmi);
-#ifdef CONFIG_XEN_PV
+#if defined(CONFIG_XEN_PV) && defined(CONFIG_X86_64)
 DECLARE_IDTENTRY_RAW(X86_TRAP_NMI,	xenpv_exc_nmi);
 #endif
 
@@ -563,7 +563,7 @@ DECLARE_IDTENTRY_DEBUG(X86_TRAP_DB,	exc_debug);
 #else
 DECLARE_IDTENTRY_RAW(X86_TRAP_DB,	exc_debug);
 #endif
-#ifdef CONFIG_XEN_PV
+#if defined(CONFIG_XEN_PV) && defined(CONFIG_X86_64)
 DECLARE_IDTENTRY_RAW(X86_TRAP_DB,	xenpv_exc_debug);
 #endif