linux-kernel - Re: [PATCH 4/6] mm: proc: Invalidate TLB after clearing soft-dirty page state

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Message-ID: <20201120150930.GC3092@hirez.programming.kicks-ass.net>
Date:   Fri, 20 Nov 2020 16:09:30 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Will Deacon <will@...nel.org>
Cc:     linux-kernel@...r.kernel.org, kernel-team@...roid.com,
        Catalin Marinas <catalin.marinas@....com>,
        Yu Zhao <yuzhao@...gle.com>, Minchan Kim <minchan@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Anshuman Khandual <anshuman.khandual@....com>,
        linux-mm@...ck.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 4/6] mm: proc: Invalidate TLB after clearing soft-dirty
 page state

On Fri, Nov 20, 2020 at 04:00:23PM +0100, Peter Zijlstra wrote:

> If you look at __tlb_remove_tlb_entry()

... you'll also find we can probably do this ... :-)

diff --git a/arch/sparc/include/asm/tlb_64.h b/arch/sparc/include/asm/tlb_64.h
index e841cae544c2..779a5a0f0608 100644
--- a/arch/sparc/include/asm/tlb_64.h
+++ b/arch/sparc/include/asm/tlb_64.h
@@ -24,7 +24,6 @@ void flush_tlb_pending(void);
 
 #define tlb_start_vma(tlb, vma) do { } while (0)
 #define tlb_end_vma(tlb, vma)	do { } while (0)
-#define __tlb_remove_tlb_entry(tlb, ptep, address) do { } while (0)
 #define tlb_flush(tlb)	flush_tlb_pending()
 
 /*
diff --git a/arch/x86/include/asm/tlb.h b/arch/x86/include/asm/tlb.h
index 820082bd6880..1bfe979bb9bc 100644
--- a/arch/x86/include/asm/tlb.h
+++ b/arch/x86/include/asm/tlb.h
@@ -4,7 +4,6 @@
 
 #define tlb_start_vma(tlb, vma) do { } while (0)
 #define tlb_end_vma(tlb, vma) do { } while (0)
-#define __tlb_remove_tlb_entry(tlb, ptep, address) do { } while (0)
 
 #define tlb_flush tlb_flush
 static inline void tlb_flush(struct mmu_gather *tlb);