linux-kernel - Re: [PATCH 01/13] x86/acpi: Extract ACPI MADT wakeup code into a separate file

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Message-ID: <20231009133216.pmihemrukk6k63mo@box.shutemov.name>
Date:   Mon, 9 Oct 2023 16:32:16 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Elena Reshetova <elena.reshetova@...el.com>,
        Jun Nakajima <jun.nakajima@...el.com>,
        Rick Edgecombe <rick.p.edgecombe@...el.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        kexec@...ts.infradead.org, linux-coco@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/13] x86/acpi: Extract ACPI MADT wakeup code into a
 separate file

On Fri, Oct 06, 2023 at 11:33:47AM -0700, Kuppuswamy Sathyanarayanan wrote:
> Hi Kirill,
> 
> On 10/5/2023 6:13 AM, Kirill A. Shutemov wrote:
> > In order to prepare for the expansion of support for the ACPI MADT
> > wakeup method, the relevant code has been moved into a separate file.
> > A new configuration option has been introduced to clearly indicate
> > dependencies without the use of ifdefs.
> > 
> > There have been no functional changes.
> > 
> > Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> > ---
> >  arch/x86/Kconfig                   |  7 +++
> >  arch/x86/include/asm/acpi.h        |  5 ++
> >  arch/x86/kernel/acpi/Makefile      | 11 ++--
> >  arch/x86/kernel/acpi/boot.c        | 86 +-----------------------------
> >  arch/x86/kernel/acpi/madt_wakeup.c | 80 +++++++++++++++++++++++++++
> >  5 files changed, 99 insertions(+), 90 deletions(-)
> >  create mode 100644 arch/x86/kernel/acpi/madt_wakeup.c
> > 
> > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> > index 3154dbc49cf5..7368d254d01f 100644
> > --- a/arch/x86/Kconfig
> > +++ b/arch/x86/Kconfig
> > @@ -1108,6 +1108,13 @@ config X86_LOCAL_APIC
> >  	depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC || PCI_MSI
> >  	select IRQ_DOMAIN_HIERARCHY
> >  
> > +config X86_ACPI_MADT_WAKEUP
> > +	def_bool y
> > +	depends on X86_64
> > +	depends on ACPI
> > +	depends on SMP
> > +	depends on X86_LOCAL_APIC
> > +
> >  config X86_IO_APIC
> >  	def_bool y
> >  	depends on X86_LOCAL_APIC || X86_UP_IOAPIC
> > diff --git a/arch/x86/include/asm/acpi.h b/arch/x86/include/asm/acpi.h
> > index c8a7fc23f63c..b536b5a6a57b 100644
> > --- a/arch/x86/include/asm/acpi.h
> > +++ b/arch/x86/include/asm/acpi.h
> > @@ -73,6 +73,11 @@ static inline bool acpi_skip_set_wakeup_address(void)
> >  
> >  #define acpi_skip_set_wakeup_address acpi_skip_set_wakeup_address
> >  
> > +union acpi_subtable_headers;
> > +
> > +int __init acpi_parse_mp_wake(union acpi_subtable_headers *header,
> > +			      const unsigned long end);
> > +
> 
> IMO, you don't need to declare acpi_parse_mp_wake() in asm/acpi.h. Since the
> only user of this function is in arch/x86/kernel/acpi, you can either create
> a header file there or re-use sleep.h.

Is it a really a bid deal? I don't see how it fits into sleep.h and
introducing one more header file for one declaration seems excessive.

> If you want to leave it here, do you want to protect it with
> CONFIG_X86_ACPI_MADT_WAKEUP?

Declarations are harmless if nobody uses them. Needless ifdeffery hurts
eyes :P

-- 
  Kiryl Shutsemau / Kirill A. Shutemov