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

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Message-ID: <1978805cd53.d7656d5d435218.1873813773955537604@linux.beauty>
Date: Thu, 19 Jun 2025 19:49:31 +0800
From: Li Chen <me@...ux.beauty>
To: "Catalin Marinas" <catalin.marinas@....com>,
	"Will Deacon" <will@...nel.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	"Len Brown" <lenb@...nel.org>, "Hanjun Guo" <guohanjun@...wei.com>,
	"Liu Wei" <liuwei09@...tc.cn>, "Ryan Roberts" <ryan.roberts@....com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Jonathan Cameron" <Jonathan.Cameron@...wei.com>,
	"Sudeep Holla" <sudeep.holla@....com>,
	"linux-arm-kernel" <linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel" <linux-kernel@...r.kernel.org>,
	"linux-acpi" <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH 0/2] ACPI: Improve SPCR handling and messaging on
 SPCR-less systems

Gentle ping incase of forgotten.

 ---- On Fri, 06 Jun 2025 15:27:43 +0800  Li Chen <me@...ux.beauty> wrote --- 
 > From: Li Chen <chenl311@...natelecom.cn>
 > 
 > 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"
 > 
 > Or if with acpi=nospcr:
 > "Use ACPI SPCR as default console: No"
 > 
 > 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.
 > 
 > This results in cleaner and more accurate boot logs on ARM64.
 > 
 > Tested on both SPCR-enabled and SPCR-less qemu-system arm64 virt platform. [1]
 > 
 > [1]: https://patchew.org/QEMU/20250528105404.457729-1-me@linux.beauty/
 > 
 > Li Chen (2):
 >   ACPI: Return -ENODEV from acpi_parse_spcr() when SPCR support is
 >     disabled
 >   ACPI: Suppress misleading SPCR console message when SPCR table is
 >     absent
 > 
 >  arch/arm64/kernel/acpi.c | 9 ++++++---
 >  include/linux/acpi.h     | 2 +-
 >  2 files changed, 7 insertions(+), 4 deletions(-)
 > 
 > -- 
 > 2.49.0
 > 
 > 

Regards,
Li