On Wed, Mar 31, 2021 at 10:02 PM Jisheng Zhang
<jszhang3@xxxxxxxxxxxxxxxx> wrote:
>
> From: Jisheng Zhang <jszhang@xxxxxxxxxx>
>
> Constify the sbi_ipi_ops so that it will be placed in the .rodata
> section. This will cause attempts to modify it to fail when strict
> page permissions are in place.
>
> Signed-off-by: Jisheng Zhang <jszhang@xxxxxxxxxx>
Looks good to me.
Reviewed-by: Anup Patel <anup@xxxxxxxxxxxxxx>
Regards,
Anup
> ---
> arch/riscv/include/asm/smp.h | 4 ++--
> arch/riscv/kernel/sbi.c | 2 +-
> arch/riscv/kernel/smp.c | 4 ++--
> 3 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/arch/riscv/include/asm/smp.h b/arch/riscv/include/asm/smp.h
> index df1f7c4cd433..a7d2811f3536 100644
> --- a/arch/riscv/include/asm/smp.h
> +++ b/arch/riscv/include/asm/smp.h
> @@ -46,7 +46,7 @@ int riscv_hartid_to_cpuid(int hartid);
> void riscv_cpuid_to_hartid_mask(const struct cpumask *in, struct cpumask *out);
>
> /* Set custom IPI operations */
> -void riscv_set_ipi_ops(struct riscv_ipi_ops *ops);
> +void riscv_set_ipi_ops(const struct riscv_ipi_ops *ops);
>
> /* Clear IPI for current CPU */
> void riscv_clear_ipi(void);
> @@ -92,7 +92,7 @@ static inline void riscv_cpuid_to_hartid_mask(const struct cpumask *in,
> cpumask_set_cpu(boot_cpu_hartid, out);
> }
>
> -static inline void riscv_set_ipi_ops(struct riscv_ipi_ops *ops)
> +static inline void riscv_set_ipi_ops(const struct riscv_ipi_ops *ops)
> {
> }
>
> diff --git a/arch/riscv/kernel/sbi.c b/arch/riscv/kernel/sbi.c
> index cbd94a72eaa7..cb848e80865e 100644
> --- a/arch/riscv/kernel/sbi.c
> +++ b/arch/riscv/kernel/sbi.c
> @@ -556,7 +556,7 @@ static void sbi_send_cpumask_ipi(const struct cpumask *target)
> sbi_send_ipi(cpumask_bits(&hartid_mask));
> }
>
> -static struct riscv_ipi_ops sbi_ipi_ops = {
> +static const struct riscv_ipi_ops sbi_ipi_ops = {
> .ipi_inject = sbi_send_cpumask_ipi
> };
>
> diff --git a/arch/riscv/kernel/smp.c b/arch/riscv/kernel/smp.c
> index 504284d49135..e035124f06dc 100644
> --- a/arch/riscv/kernel/smp.c
> +++ b/arch/riscv/kernel/smp.c
> @@ -85,9 +85,9 @@ static void ipi_stop(void)
> wait_for_interrupt();
> }
>
> -static struct riscv_ipi_ops *ipi_ops __ro_after_init;
> +static const struct riscv_ipi_ops *ipi_ops __ro_after_init;
>
> -void riscv_set_ipi_ops(struct riscv_ipi_ops *ops)
> +void riscv_set_ipi_ops(const struct riscv_ipi_ops *ops)
> {
> ipi_ops = ops;
> }
> --
> 2.31.0
>
>
>
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