linux-kernel - Re: [PATCH RESEND 5/7] RISC-V: entry: Remove unneeded need

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Message-ID: <mhng-066fe6a6-4d0a-4286-bc01-faaf21ff2698@palmer-si-x1e>
Date:   Wed, 29 May 2019 21:09:19 -0700 (PDT)
From:   Palmer Dabbelt <palmer@...ive.com>
To:     valentin.schneider@....com
CC:     linux-kernel@...r.kernel.org, aou@...s.berkeley.edu,
        linux-riscv@...ts.infradead.org
Subject:     Re: [PATCH RESEND 5/7] RISC-V: entry: Remove unneeded need_resched() loop

On Tue, 28 May 2019 03:48:46 PDT (-0700), valentin.schneider@....com wrote:
> Since the enabling and disabling of IRQs within preempt_schedule_irq()
> is contained in a need_resched() loop, we don't need the outer arch
> code loop.
>
> Signed-off-by: Valentin Schneider <valentin.schneider@....com>
> Cc: Palmer Dabbelt <palmer@...ive.com>
> Cc: Albert Ou <aou@...s.berkeley.edu>
> Cc: linux-riscv@...ts.infradead.org
> ---
>  arch/riscv/kernel/entry.S | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S
> index 1c1ecc238cfa..d0b1b9660283 100644
> --- a/arch/riscv/kernel/entry.S
> +++ b/arch/riscv/kernel/entry.S
> @@ -258,12 +258,11 @@ restore_all:
>  resume_kernel:
>  	REG_L s0, TASK_TI_PREEMPT_COUNT(tp)
>  	bnez s0, restore_all
> -need_resched:
>  	REG_L s0, TASK_TI_FLAGS(tp)
>  	andi s0, s0, _TIF_NEED_RESCHED
>  	beqz s0, restore_all
>  	call preempt_schedule_irq
> -	j need_resched
> +	j restore_all
>  #endif
>
>  work_pending:

Sorry I missed this the first time around.

Reviewed-by: Palmer Dabbelt <palmer@...ive.com>

Do you want this through the RISC-V tree, or are you going to take it?