Am Mittwoch, 16. Februar 2022, 01:29:10 CET schrieb Atish Patra:
> 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.
>
> Signed-off-by: Atish Patra <atishp@xxxxxxxxxxxx>
> ---
> 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 59c70c104256..cb9c9e0aab31 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;
hmm, should (and can) this create some warning about the ignored
malformed ISA string?
Otherwise
Tested-by: Heiko Stuebner <heiko@xxxxxxxxx>
> bitmap_zero(this_isa, RISCV_ISA_EXT_MAX);
> for (; *isa; ++isa) {
> const char *ext = isa++;
>
