Re: [PATCH 0/2] ACPI: Improve SPCR handling and messaging on SPCR-less systems

[Hanjun Guo]

Hi Li Chen,

On 2025/6/6 15:27, Li Chen wrote:
> From: Li Chen <chenl311@xxxxxxxxxxxxxxx>
>
> This small series improves the kernel behavior and output when the ACPI SPCR
> table is not present or not supported.
>
> Currently, even on systems that completely lack an SPCR table, the kernel prints:
> "Use ACPI SPCR as default console: Yes"

Agreed, this is wrong, we need to fix it.

> Or if with acpi=nospcr:
> "Use ACPI SPCR as default console: No"

I think this is OK, it's just to let you know we are not
using ACPI SPCR console when ACPI is enabled, including
cases with no SPCR table.

> This may mislead users into thinking an SPCR table exists
> when in fact there is no such table at all. This series addresses this in two steps:
>
> Patch 1 ensures that acpi_parse_spcr() returns -ENODEV if CONFIG_ACPI_SPCR_TABLE is disabled.
>
> Patch 2 updates arm64 acpi_boot_table_init() to only print the SPCR console message
> if acpi_parse_spcr() succeeds.

I have some detail comments for patch 2.

Thanks
Hanjun