From: Palmer Dabbelt <palmer@dabbelt.com>
To: vgupta@kernel.org
Cc: Paul Walmsley <paul.walmsley@sifive.com>,
aou@eecs.berkeley.edu, Anup Patel <Anup.Patel@wdc.com>,
jszhang@kernel.org, guoren@linux.alibaba.com,
wangkefeng.wang@huawei.com, linux-riscv@lists.infradead.org,
linux-kernel@vger.kernel.org, vgupta@kernel.org,
anup@brainfault.org
Subject: Re: [PATCH v2] riscv: mm: don't advertise 1 num_asid for 0 asid bits
Date: Sun, 03 Oct 2021 10:10:09 -0700 (PDT) [thread overview]
Message-ID: <mhng-b9942988-c667-4fb9-9047-7033a62dbb74@palmerdabbelt-glaptop> (raw)
In-Reply-To: <20210908173029.1104897-1-vgupta@kernel.org>
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.
prev parent reply other threads:[~2021-10-03 17:10 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-07 20:02 [PATCH] riscv: mm: don't advertise 1 num_asid for 0 asid bits Vineet Gupta
2021-09-08 8:35 ` Anup Patel
2021-09-08 17:30 ` [PATCH v2] " Vineet Gupta
2021-10-03 17:10 ` Palmer Dabbelt [this message]
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