linux-kernel - [PATCH] arm: asm/tlb.h: Fix build error implicit func declaration

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Date:   Wed, 25 Jul 2018 11:55:57 +0200
From:   Anders Roxell <anders.roxell@...aro.org>
To:     riel@...riel.com, peterz@...radead.org, mingo@...nel.org,
        songliubraving@...com, linux@...linux.org.uk,
        dave.hansen@...el.com, x86@...nel.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Anders Roxell <anders.roxell@...aro.org>
Subject: [PATCH] arm: asm/tlb.h: Fix build error implicit func declaration

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.
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]
  tlb_flush_remove_tables_local(mm);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  tlb_remove_table
mm/memory.c: In function ‘tlb_table_flush’:
mm/memory.c:372:2: error: implicit declaration of function ‘tlb_flush_remove_tables’; did you mean ‘tlb_remove_table’? [-Werror=implicit-function-declaration]
  tlb_flush_remove_tables(tlb->mm);
  ^~~~~~~~~~~~~~~~~~~~~~~
  tlb_remove_table

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

Fixes: 2ff6ddf19c0e ("x86/mm/tlb: Leave lazy TLB mode at page table free time")
Signed-off-by: Anders Roxell <anders.roxell@...aro.org>
---

Ingo, would it make sense for you to pick it up into the x86 tree since
that contains the bug ?

Cheers,
Anders

 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
-- 
2.18.0