linux-kernel - Re: [PATCH 05/17] riscv: use CSR_SATP instead of the legacy sptbr name in switch

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Date:   Mon, 1 Jul 2019 18:53:21 +0000
From:   Atish Patra <Atish.Patra@....com>
To:     "hch@....de" <hch@....de>,
        "paul.walmsley@...ive.com" <paul.walmsley@...ive.com>,
        "palmer@...ive.com" <palmer@...ive.com>
CC:     "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Damien Le Moal <Damien.LeMoal@....com>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 05/17] riscv: use CSR_SATP instead of the legacy sptbr
 name in switch_mm

On Mon, 2019-06-24 at 07:42 +0200, Christoph Hellwig wrote:
> Switch to our own constant for the satp register instead of using
> the old name from a legacy version of the privileged spec.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  arch/riscv/mm/context.c | 7 +------
>  1 file changed, 1 insertion(+), 6 deletions(-)
> 
> diff --git a/arch/riscv/mm/context.c b/arch/riscv/mm/context.c
> index 89ceb3cbe218..beeb5d7f92ea 100644
> --- a/arch/riscv/mm/context.c
> +++ b/arch/riscv/mm/context.c
> @@ -57,12 +57,7 @@ void switch_mm(struct mm_struct *prev, struct
> mm_struct *next,
>  	cpumask_clear_cpu(cpu, mm_cpumask(prev));
>  	cpumask_set_cpu(cpu, mm_cpumask(next));
>  
> -	/*
> -	 * Use the old spbtr name instead of using the current satp
> -	 * name to support binutils 2.29 which doesn't know about the
> -	 * privileged ISA 1.10 yet.
> -	 */
> -	csr_write(sptbr, virt_to_pfn(next->pgd) | SATP_MODE);
> +	csr_write(CSR_SATP, virt_to_pfn(next->pgd) | SATP_MODE);
>  	local_flush_tlb_all();
>  
>  	flush_icache_deferred(next);

Reviewed-by: Atish Patra <atish.patra@....com>

-- 
Regards,
Atish