From 08c1a30975dd9294db1ae704ee9fb09cfb3fe5ab Mon Sep 17 00:00:00 2001
From: Laurent Dufour <ldufour@linux.ibm.com>
Date: Tue, 16 Apr 2019 15:44:53 +0200
Subject: [PATCH] FROMLIST: x86/mm: define ARCH_SUPPORTS_SPECULATIVE_PAGE_FAULT
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Set ARCH_SUPPORTS_SPECULATIVE_PAGE_FAULT which turns on the
Speculative Page Fault handler when building for 64bit.

Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Laurent Dufour <ldufour@linux.ibm.com>
Reviewed-by: Jérôme Glisse <jglisse@redhat.com>

Link: https://lore.kernel.org/patchwork/patch/1062687/
Bug: 161210518
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Change-Id: I083e902d2daf671e3e06d10306dd9af591c9521b
---
 arch/x86/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index da856278b516..4d00555b8ba8 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -26,6 +26,7 @@ config X86_64
 	# Options that are inherently 64-bit kernel only:
 	select ARCH_HAS_GIGANTIC_PAGE
 	select ARCH_SUPPORTS_INT128 if CC_HAS_INT128
+	select ARCH_SUPPORTS_SPECULATIVE_PAGE_FAULT
 	select ARCH_USE_CMPXCHG_LOCKREF
 	select HAVE_ARCH_SOFT_DIRTY
 	select MODULES_USE_ELF_RELA