linux-kernel - Re: [PATCH v6 5/6] RISC-V: Do no continue isa string parsing without correct XLEN

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Date:   Tue, 15 Mar 2022 08:39:37 +0530
From:   Anup Patel <anup@...infault.org>
To:     Atish Patra <atishp@...osinc.com>
Cc:     "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Albert Ou <aou@...s.berkeley.edu>,
        Atish Patra <atishp@...shpatra.org>,
        Damien Le Moal <damien.lemoal@....com>,
        DTML <devicetree@...r.kernel.org>,
        Jisheng Zhang <jszhang@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH v6 5/6] RISC-V: Do no continue isa string parsing without
 correct XLEN

On Tue, Mar 15, 2022 at 2:09 AM Atish Patra <atishp@...osinc.com> wrote:
>
> The isa string should begin with either rv64 or rv32. Otherwise, it is
> an incorrect isa string. Currently, the string parsing continues even if
> it doesnot begin with current XLEN.
>
> Fix this by checking if it found "rv64" or "rv32" in the beginning.
>
> Tested-by: Heiko Stuebner <heiko@...ech.de>
> Signed-off-by: Atish Patra <atishp@...osinc.com>

Reviewed-by: Anup Patel <anup@...infault.org>

Regards,
Anup

> ---
>  arch/riscv/kernel/cpufeature.c | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
> index 3455fdfd680e..a43c08af5f4b 100644
> --- a/arch/riscv/kernel/cpufeature.c
> +++ b/arch/riscv/kernel/cpufeature.c
> @@ -84,6 +84,7 @@ void __init riscv_fill_hwcap(void)
>         for_each_of_cpu_node(node) {
>                 unsigned long this_hwcap = 0;
>                 DECLARE_BITMAP(this_isa, RISCV_ISA_EXT_MAX);
> +               const char *temp;
>
>                 if (riscv_of_processor_hartid(node) < 0)
>                         continue;
> @@ -93,6 +94,7 @@ void __init riscv_fill_hwcap(void)
>                         continue;
>                 }
>
> +               temp = isa;
>  #if IS_ENABLED(CONFIG_32BIT)
>                 if (!strncmp(isa, "rv32", 4))
>                         isa += 4;
> @@ -100,6 +102,9 @@ void __init riscv_fill_hwcap(void)
>                 if (!strncmp(isa, "rv64", 4))
>                         isa += 4;
>  #endif
> +               /* The riscv,isa DT property must start with rv64 or rv32 */
> +               if (temp == isa)
> +                       continue;
>                 bitmap_zero(this_isa, RISCV_ISA_EXT_MAX);
>                 for (; *isa; ++isa) {
>                         const char *ext = isa++;
> --
> 2.30.2
>