Re: [PATCH -fixes] riscv: Fix arch_tlbbatch_flush() by clearing the batch cpumask

From: Jisheng Zhang <jszhang@kernel.org>
To: Charlie Jenkins <charlie@rivosinc.com>
Cc: Alexandre Ghiti <alexghiti@rivosinc.com>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH -fixes] riscv: Fix arch_tlbbatch_flush() by clearing the batch cpumask
Date: Tue, 6 Feb 2024 18:15:04 +0800	[thread overview]
Message-ID: <ZcIGqBSHzjI1xVRX@xhacker> (raw)
In-Reply-To: <ZcF8z18dwnGsw0Ix@ghost>

On Mon, Feb 05, 2024 at 04:26:55PM -0800, Charlie Jenkins wrote:
> On Tue, Jan 30, 2024 at 12:55:08PM +0100, Alexandre Ghiti wrote:
> > We must clear the cpumask once we have flushed the batch, otherwise cpus
> > get accumulated and we end sending IPIs to more cpus than needed.
> > 
> > Fixes: 54d7431af73e ("riscv: Add support for BATCHED_UNMAP_TLB_FLUSH")
> > Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>

Reviewed-by: Jisheng Zhang <jszhang@kernel.org>
> > ---
> >  arch/riscv/mm/tlbflush.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/arch/riscv/mm/tlbflush.c b/arch/riscv/mm/tlbflush.c
> > index 99c3e037f127..c8efc3f87a0f 100644
> > --- a/arch/riscv/mm/tlbflush.c
> > +++ b/arch/riscv/mm/tlbflush.c
> > @@ -240,4 +240,5 @@ void arch_tlbbatch_flush(struct arch_tlbflush_unmap_batch *batch)
> >  {
> >  	__flush_tlb_range(NULL, &batch->cpumask,
> >  			  0, FLUSH_TLB_MAX_SIZE, PAGE_SIZE);
> > +	cpumask_clear(&batch->cpumask);
> >  }
> > -- 
> > 2.39.2
> > 
> > 
> > _______________________________________________
> > linux-riscv mailing list
> > linux-riscv@lists.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-riscv
> 
> Reviewed-by: Charlie Jenkins <charlie@rivosinc.com>
>