linux-kernel - Re: [PATCH 2/3] RISC-V: Fix handling of empty cpu masks

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Date:   Mon, 31 Jan 2022 13:16:54 -0800
From:   Atish Patra <atishp@...shpatra.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <anup@...infault.org>,
        Atish Patra <atishp@...osinc.com>,
        Jessica Clarke <jrtc27@...c27.com>,
        Emil Renner Berthing <kernel@...il.dk>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] RISC-V: Fix handling of empty cpu masks

On Mon, Jan 31, 2022 at 5:26 AM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> The cpumask rework slightly changed the behavior of the code.  Fix this
> by treating an empty cpumask as meaning all online CPUs.
>
> Extracted from a patch by Atish Patra <atishp@...osinc.com>.
>
> Reported-by: Jessica Clarke <jrtc27@...c27.com>
> Fixes: 26fb751ca37846c9 ("RISC-V: Do not use cpumask data structure for hartid bitmap")
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> ---
>  arch/riscv/kernel/sbi.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/arch/riscv/kernel/sbi.c b/arch/riscv/kernel/sbi.c
> index f93bc75f2bc43c8e..22444cfcd56cc646 100644
> --- a/arch/riscv/kernel/sbi.c
> +++ b/arch/riscv/kernel/sbi.c
> @@ -161,7 +161,7 @@ static int __sbi_send_ipi_v01(const struct cpumask *cpu_mask)
>  {
>         unsigned long hart_mask;
>
> -       if (!cpu_mask)
> +       if (!cpu_mask || cpumask_empty(cpu_mask))
>                 cpu_mask = cpu_online_mask;
>         hart_mask = __sbi_v01_cpumask_to_hartmask(cpu_mask);
>
> @@ -177,7 +177,7 @@ static int __sbi_rfence_v01(int fid, const struct cpumask *cpu_mask,
>         int result = 0;
>         unsigned long hart_mask;
>
> -       if (!cpu_mask)
> +       if (!cpu_mask || cpumask_empty(cpu_mask))
>                 cpu_mask = cpu_online_mask;
>         hart_mask = __sbi_v01_cpumask_to_hartmask(cpu_mask);
>
> @@ -254,7 +254,7 @@ static int __sbi_send_ipi_v02(const struct cpumask *cpu_mask)
>         struct sbiret ret = {0};
>         int result;
>
> -       if (!cpu_mask)
> +       if (!cpu_mask || cpumask_empty(cpu_mask))
>                 cpu_mask = cpu_online_mask;
>
>         for_each_cpu(cpuid, cpu_mask) {
> @@ -348,7 +348,7 @@ static int __sbi_rfence_v02(int fid, const struct cpumask *cpu_mask,
>         unsigned long hartid, cpuid, hmask = 0, hbase = 0;
>         int result;
>
> -       if (!cpu_mask)
> +       if (!cpu_mask || cpumask_empty(cpu_mask))
>                 cpu_mask = cpu_online_mask;
>
>         for_each_cpu(cpuid, cpu_mask) {
> --
> 2.25.1
>
>
> _______________________________________________
> linux-riscv mailing list
> linux-riscv@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-riscv


Reviewed-by: Atish Patra <atishp@...osinc.com>


-- 
Regards,
Atish

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