From 0a3b240e5242ca9650943be862a03feea0142cb1 Mon Sep 17 00:00:00 2001
From: Anders Roxell <anders.roxell@linaro.org>
Date: Wed, 25 Jul 2018 11:55:57 +0200
Subject: [PATCH] arm/asm/tlb.h: Fix build error implicit func declaration
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

References: bnc#1105467 Reduce IPIs and atomic ops with improved lazy TLB
Patch-mainline: v4.19-rc1
Git-commit: 063daa8129f94d651c4d30a8333b577c5bbf8090

Building on arm 32 with LPAE enabled we don't include asm-generic/tlb.h,
where we have tlb_flush_remove_tables_local and tlb_flush_remove_tables
defined.

The build fails with:

  mm/memory.c: In function ‘tlb_remove_table_smp_sync’:
  mm/memory.c:339:2: error: implicit declaration of function ‘tlb_flush_remove_tables_local’; did you mean ‘tlb_remove_table’? [-Werror=implicit-function-declaration]
  ...

This bug got introduced in:

  2ff6ddf19c0e ("x86/mm/tlb: Leave lazy TLB mode at page table free time")

To fix this issue we define them in arm 32's specific asm/tlb.h file as well.

Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: dave.hansen@intel.com
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux@armlinux.org.uk
Cc: riel@surriel.com
Cc: songliubraving@fb.com
Fixes: 2ff6ddf19c0e ("x86/mm/tlb: Leave lazy TLB mode at page table free time")
Link: http://lkml.kernel.org/r/20180725095557.19668-1-anders.roxell@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Mel Gorman <mgorman@suse.de>
---
 arch/arm/include/asm/tlb.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm/include/asm/tlb.h b/arch/arm/include/asm/tlb.h
index d5562f9ce600..f854148c8d7c 100644
--- a/arch/arm/include/asm/tlb.h
+++ b/arch/arm/include/asm/tlb.h
@@ -292,5 +292,13 @@ static inline void tlb_remove_check_page_size_change(struct mmu_gather *tlb,
 {
 }
 
+static inline void tlb_flush_remove_tables(struct mm_struct *mm)
+{
+}
+
+static inline void tlb_flush_remove_tables_local(void *arg)
+{
+}
+
 #endif /* CONFIG_MMU */
 #endif