linux-kernel - Re: [PATCH v4 6/6] nfit allow override of root dsm mask

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Message-ID: <CAPcyv4iR4T_umcF3H2aEGidmFMLUg4KSLmqMyoYvkOpbzn_YDQ@mail.gmail.com>
Date:   Fri, 30 Jun 2017 20:49:50 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Jerry Hoemann <jerry.hoemann@....com>
Cc:     "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 6/6] nfit allow override of root dsm mask

On Fri, Jun 30, 2017 at 9:09 AM, Jerry Hoemann <jerry.hoemann@....com> wrote:
> Have module parameter override_dsm_mask override the dsm_mask for
> root calls like it does for non-root dsm calls.
>
> Signed-off-by: Jerry Hoemann <jerry.hoemann@....com>
> ---
>  drivers/acpi/nfit/core.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
> index 4e24d69..87acaf2 100644
> --- a/drivers/acpi/nfit/core.c
> +++ b/drivers/acpi/nfit/core.c
> @@ -1641,6 +1641,8 @@ static void acpi_nfit_init_dsms(struct acpi_nfit_desc *acpi_desc)
>         set_bit(ND_CMD_CALL, &nd_desc->cmd_mask);
>
>         dsm_mask = 0x3bf;
> +       if (override_dsm_mask)
> +               dsm_mask = override_dsm_mask;
>         for_each_set_bit(i, &dsm_mask, BITS_PER_LONG)
>                 if (acpi_check_dsm(adev->handle, uuid, 1, 1ULL << i))
>                         set_bit(i, &nd_desc->bus_dsm_mask);

Another reason not to apply this is to take a look at what happened
with the introduction of _LSI, _LSR, and _LSW. We should not expect
that _DSM will keep being used for future NVDIMM root bus methods.