linux-kernel - Re: [PATCH 11/12] ACPI/sleep: Convert acpi_wakeup

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Date:   Wed, 20 Nov 2019 11:58:31 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, Len Brown <len.brown@...el.com>,
        Pavel Machek <pavel@....cz>, Tony Luck <tony.luck@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Nadav Amit <namit@...are.com>,
        "VMware, Inc." <pv-drivers@...are.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Cezary Rojewski <cezary.rojewski@...el.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Liam Girdwood <liam.r.girdwood@...ux.intel.com>,
        Jie Yang <yang.jie@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, linux-ia64@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-efi@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-acpi@...r.kernel.org, alsa-devel@...a-project.org
Subject: Re: [PATCH 11/12] ACPI/sleep: Convert acpi_wakeup_address into a function

On Tuesday, November 19, 2019 1:21:20 AM CET Sean Christopherson wrote:
> Convert acpi_wakeup_address from a raw variable into a function so that
> x86 can wrap its dereference of the real mode boot header in a function
> instead of broadcasting it to the world via a #define.  This sets the
> stage for a future patch to move the definition of acpi_wakeup_address()
> out of asm/acpi.h and thus break acpi.h's dependency on asm/realmode.h.
> 
> No functional change intended.
> 
> Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

> ---
>  arch/ia64/include/asm/acpi.h | 5 ++++-
>  arch/ia64/kernel/acpi.c      | 2 --
>  arch/x86/include/asm/acpi.h  | 5 ++++-
>  drivers/acpi/sleep.c         | 4 ++--
>  4 files changed, 10 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/ia64/include/asm/acpi.h b/arch/ia64/include/asm/acpi.h
> index f886d4dc9d55..36d7003eee71 100644
> --- a/arch/ia64/include/asm/acpi.h
> +++ b/arch/ia64/include/asm/acpi.h
> @@ -38,7 +38,10 @@ int acpi_gsi_to_irq (u32 gsi, unsigned int *irq);
>  /* Low-level suspend routine. */
>  extern int acpi_suspend_lowlevel(void);
>  
> -extern unsigned long acpi_wakeup_address;
> +static inline unsigned long acpi_wakeup_address(void)
> +{
> +	return 0;
> +}
>  
>  /*
>   * Record the cpei override flag and current logical cpu. This is
> diff --git a/arch/ia64/kernel/acpi.c b/arch/ia64/kernel/acpi.c
> index 70d1587ddcd4..a5636524af76 100644
> --- a/arch/ia64/kernel/acpi.c
> +++ b/arch/ia64/kernel/acpi.c
> @@ -42,8 +42,6 @@ int acpi_lapic;
>  unsigned int acpi_cpei_override;
>  unsigned int acpi_cpei_phys_cpuid;
>  
> -unsigned long acpi_wakeup_address = 0;
> -
>  #define ACPI_MAX_PLATFORM_INTERRUPTS	256
>  
>  /* Array to record platform interrupt vectors for generic interrupt routing. */
> diff --git a/arch/x86/include/asm/acpi.h b/arch/x86/include/asm/acpi.h
> index bc9693c9107e..57788ec6fa82 100644
> --- a/arch/x86/include/asm/acpi.h
> +++ b/arch/x86/include/asm/acpi.h
> @@ -62,7 +62,10 @@ static inline void acpi_disable_pci(void)
>  extern int (*acpi_suspend_lowlevel)(void);
>  
>  /* Physical address to resume after wakeup */
> -#define acpi_wakeup_address ((unsigned long)(real_mode_header->wakeup_start))
> +static inline unsigned long acpi_wakeup_address(void)
> +{
> +	return ((unsigned long)(real_mode_header->wakeup_start));
> +}
>  
>  /*
>   * Check if the CPU can handle C2 and deeper
> diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
> index 2af937a8b1c5..9e66c4109556 100644
> --- a/drivers/acpi/sleep.c
> +++ b/drivers/acpi/sleep.c
> @@ -63,9 +63,9 @@ static int acpi_sleep_prepare(u32 acpi_state)
>  #ifdef CONFIG_ACPI_SLEEP
>  	/* do we have a wakeup address for S2 and S3? */
>  	if (acpi_state == ACPI_STATE_S3) {
> -		if (!acpi_wakeup_address)
> +		if (!acpi_wakeup_address())
>  			return -EFAULT;
> -		acpi_set_waking_vector(acpi_wakeup_address);
> +		acpi_set_waking_vector(acpi_wakeup_address());
>  
>  	}
>  	ACPI_FLUSH_CPU_CACHE();
>