linux-kernel - Re: [PATCH V2 2/5] riscv: spinwait: Fix hartid variable type

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Date:   Thu, 26 May 2022 15:56:34 -0700
From:   Atish Patra <atishp@...shpatra.org>
To:     Sunil V L <sunilvl@...tanamicro.com>
Cc:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ard Biesheuvel <ardb@...nel.org>,
        Marc Zyngier <maz@...nel.org>,
        Atish Patra <atishp@...osinc.com>,
        Heinrich Schuchardt <heinrich.schuchardt@...onical.com>,
        Anup Patel <apatel@...tanamicro.com>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
        linux-efi <linux-efi@...r.kernel.org>,
        Sunil V L <sunil.vl@...il.com>, stable@...r.kernel.org
Subject: Re: [PATCH V2 2/5] riscv: spinwait: Fix hartid variable type

On Thu, May 26, 2022 at 3:12 AM Sunil V L <sunilvl@...tanamicro.com> wrote:
>
> The hartid variable is of type int but compared with
> ULONG_MAX(INVALID_HARTID). This issue is fixed by changing
> the hartid variable type to unsigned long.
>
> Fixes: c78f94f35cf6 ("RISC-V: Use __cpu_up_stack/task_pointer only for spinwait method")
> Cc: stable@...r.kernel.org
>
> Signed-off-by: Sunil V L <sunilvl@...tanamicro.com>
> ---
>  arch/riscv/kernel/cpu_ops_spinwait.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/riscv/kernel/cpu_ops_spinwait.c b/arch/riscv/kernel/cpu_ops_spinwait.c
> index 346847f6c41c..3ade9152a3c7 100644
> --- a/arch/riscv/kernel/cpu_ops_spinwait.c
> +++ b/arch/riscv/kernel/cpu_ops_spinwait.c
> @@ -18,7 +18,7 @@ void *__cpu_spinwait_task_pointer[NR_CPUS] __section(".data");
>  static void cpu_update_secondary_bootdata(unsigned int cpuid,
>                                    struct task_struct *tidle)
>  {
> -       int hartid = cpuid_to_hartid_map(cpuid);
> +       unsigned long hartid = cpuid_to_hartid_map(cpuid);
>
>         /*
>          * The hartid must be less than NR_CPUS to avoid out-of-bound access
> @@ -27,7 +27,7 @@ static void cpu_update_secondary_bootdata(unsigned int cpuid,
>          * spinwait booting is not the recommended approach for any platforms
>          * booting Linux in S-mode and can be disabled in the future.
>          */
> -       if (hartid == INVALID_HARTID || hartid >= NR_CPUS)
> +       if (hartid == INVALID_HARTID || hartid >= (unsigned long) NR_CPUS)
>                 return;
>
>         /* Make sure tidle is updated */
> --
> 2.25.1
>

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

-- 
Regards,
Atish