linux-kernel - Re: [PATCH v4 1/3] RISC-V: Do not invoke SBI call if cpumask is empty

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Message-ID: <20190822081007.GA17573@lst.de>
Date:   Thu, 22 Aug 2019 10:10:07 +0200
From:   Christoph Hellwig <hch@....de>
To:     Atish Patra <atish.patra@....com>
Cc:     linux-kernel@...r.kernel.org, Albert Ou <aou@...s.berkeley.edu>,
        linux-riscv@...ts.infradead.org,
        Palmer Dabbelt <palmer@...ive.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Christoph Hellwig <hch@....de>, Anup Patel <Anup.Patel@....com>
Subject: Re: [PATCH v4 1/3] RISC-V: Do not invoke SBI call if cpumask is
 empty

On Thu, Aug 22, 2019 at 12:51:49AM -0700, Atish Patra wrote:
> SBI calls are expensive. If cpumask is empty, there is no need to
> trap via SBI as no remote tlb flushing is required.
> 
> Signed-off-by: Atish Patra <atish.patra@....com>

Looks good,

Reviewed-by: Christoph Hellwig <hch@....de>