linux-kernel - Re: [PATCH -fixes] riscv: Flush the tlb when a page directory is freed

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Date: Mon, 5 Feb 2024 15:53:54 -0800
From: Charlie Jenkins <charlie@...osinc.com>
To: Alexandre Ghiti <alexghiti@...osinc.com>
Cc: Will Deacon <will@...nel.org>,
	"Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Nick Piggin <npiggin@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Samuel Holland <samuel.holland@...ive.com>,
	Andrew Jones <ajones@...tanamicro.com>, linux-arch@...r.kernel.org,
	linux-mm@...ck.org, linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -fixes] riscv: Flush the tlb when a page directory is
 freed

On Sun, Jan 28, 2024 at 01:04:05PM +0100, Alexandre Ghiti wrote:
> The riscv privileged specification mandates to flush the TLB whenever a
> page directory is modified, so add that to tlb_flush().
> 
> Fixes: c5e9b2c2ae82 ("riscv: Improve tlb_flush()")
> Signed-off-by: Alexandre Ghiti <alexghiti@...osinc.com>
> ---
>  arch/riscv/include/asm/tlb.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/riscv/include/asm/tlb.h b/arch/riscv/include/asm/tlb.h
> index 1eb5682b2af6..50b63b5c15bd 100644
> --- a/arch/riscv/include/asm/tlb.h
> +++ b/arch/riscv/include/asm/tlb.h
> @@ -16,7 +16,7 @@ static void tlb_flush(struct mmu_gather *tlb);
>  static inline void tlb_flush(struct mmu_gather *tlb)
>  {
>  #ifdef CONFIG_MMU
> -	if (tlb->fullmm || tlb->need_flush_all)
> +	if (tlb->fullmm || tlb->need_flush_all || tlb->freed_tables)
>  		flush_tlb_mm(tlb->mm);
>  	else
>  		flush_tlb_mm_range(tlb->mm, tlb->start, tlb->end,
> -- 
> 2.39.2
> 
> 
> _______________________________________________
> linux-riscv mailing list
> linux-riscv@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-riscv

Reviewed-by: Charlie Jenkins <charlie@...osinc.com>

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