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

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Date:   Tue, 26 Nov 2019 12:16:18 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     Pavel Machek <pavel@....cz>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, Len Brown <len.brown@...el.com>,
        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


* Sean Christopherson <sean.j.christopherson@...el.com> wrote:

> On Mon, Nov 25, 2019 at 11:48:03AM +0100, Pavel Machek wrote:
> > > 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>
> > > 
> > > > --- 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());
> > > >  
> > 
> > You might want to store result in a variable... especially since you are
> > turning inline function into real one in a next patch.
> > 
> > And maybe function should be called get_acip_wakeup_address or
> > something? This way it is easy to mistake actual wakeup address from
> > function that gets it...
> 
> Agreed on both counts.
> 
> 
> Ingo,
> 
> Would you prefer a v2 of the entire series (with Acks and removal of Fixes),
> or a v2 that includes only the last two patches?

Yep, that would be handy. I have them committed to tip:core/headers, but 
haven't sent it to Linus yet, and can redo that all with these 
improvements.

Thanks,

	Ingo