From 04519e317c60d1d245443b74ae0fef2af1d6241f Mon Sep 17 00:00:00 2001
From: Sung-hun Kim <sfoon.kim@samsung.com>
Date: Wed, 8 Sep 2021 17:18:37 +0900
Subject: [PATCH] mm: THP: workaround: only allow including specific headers
 for FINEGRAINED_THP configured cases

asm/huge_mm.h and asm/finegrained_thp.h are only used for
FINEGRAINED_THP-enabled kernel. Otherwise, such as arm which does
not support contiguous PTE bit, disallow including them.

Fixes: 7d5372737d34 ("mm: THP: introducing a fine-grained transparent hugepage technique for ARM64 architecture")
Change-Id: I37c2bc46106711f4b7ee33a6838d87e929e13247
Signed-off-by: Sung-hun Kim <sfoon.kim@samsung.com>
---
 mm/khugepaged.c | 2 ++
 mm/memory.c     | 5 +++++
 mm/mmap.c       | 4 ++++
 3 files changed, 11 insertions(+)

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index aa96e8e..34f0c40 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -21,8 +21,10 @@
 
 #include <asm/tlb.h>
 #include <asm/pgalloc.h>
+#ifdef CONFIG_FINEGRAINED_THP
 #include <asm/finegrained_thp.h>
 #include <asm/huge_mm.h>
+#endif
 #include "internal.h"
 
 enum scan_result {
diff --git a/mm/memory.c b/mm/memory.c
index 08336046..bdf18e9 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -82,8 +82,13 @@
 #include <linux/uaccess.h>
 #include <asm/tlb.h>
 #include <asm/tlbflush.h>
+#ifdef CONFIG_FINEGRAINED_THP
 #include <asm/huge_mm.h>
 #include <asm/finegrained_thp.h>
+#else
+#include <asm-generic/huge_mm.h>
+#include <asm-generic/finegrained_thp.h>
+#endif
 
 #include "pgalloc-track.h"
 #include "internal.h"
diff --git a/mm/mmap.c b/mm/mmap.c
index 02eb014..cca7268 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -52,7 +52,11 @@
 #include <asm/cacheflush.h>
 #include <asm/tlb.h>
 #include <asm/mmu_context.h>
+#ifdef CONFIG_FINEGRAINED_THP
 #include <asm/finegrained_thp.h>
+#else
+#include <asm-generic/finegrained_thp.h>
+#endif
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/mmap.h>
-- 
2.7.4