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SubjectRe: [PATCH v2] riscv: mm: don't advertise 1 num_asid for 0 asid bits
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On Wed, 08 Sep 2021 10:30:29 PDT (-0700), vgupta@kernel.org wrote:
> Even if mmu doesn't support ASID, current code calculates @num_asids=1
> which is misleading, so avoid setting any asid related variables in such
> case.
>
> Also while here, print the number of asid bits discovered even for the
> disabled case.
>
> Verified this on Hifive Unmatched.
>
> Reviewed-by: Anup Patel <anup@brainfault.org>
> Signed-off-by: Vineet Gupta <vgupta@kernel.org>
> ---
> arch/riscv/mm/context.c | 8 +++++---
> 1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/arch/riscv/mm/context.c b/arch/riscv/mm/context.c
> index ee3459cb6750..ea54cc0c9106 100644
> --- a/arch/riscv/mm/context.c
> +++ b/arch/riscv/mm/context.c
> @@ -233,8 +233,10 @@ static int __init asids_init(void)
> local_flush_tlb_all();
>
> /* Pre-compute ASID details */
> - num_asids = 1 << asid_bits;
> - asid_mask = num_asids - 1;
> + if (asid_bits) {
> + num_asids = 1 << asid_bits;
> + asid_mask = num_asids - 1;
> + }
>
> /*
> * Use ASID allocator only if number of HW ASIDs are
> @@ -255,7 +257,7 @@ static int __init asids_init(void)
> pr_info("ASID allocator using %lu bits (%lu entries)\n",
> asid_bits, num_asids);
> } else {
> - pr_info("ASID allocator disabled\n");
> + pr_info("ASID allocator disabled (%lu bits)\n", asid_bits);
> }
>
> return 0;

Thanks, this is on for-next.

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